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  <title>P0898R3 Standard Library Concepts by CaseyCarter · Pull Request #2176 · cplusplus/draft · GitHub</title>



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      <meta name="description" content="Fixes #2145.
Pushing from a branch in a remote repo rather than motions-2018-06-lwg-28 as directed in the new application procedure since I don&#39;t have commit access and cannot make new branches.
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Pushing from a branch in a remote repo rather than motions-2018-06-lwg-28 as directed in the new application procedure since I don&amp;amp;#39;t have commit access and cannot make new bran..." />
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Pushing from a branch in a remote repo rather than motions-2018-06-lwg-28 as directed in the new application procedure since I don&amp;#39;t have commit access and cannot make new branches..." /><meta property="og:author:username" content="CaseyCarter" />
  




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          Discussions

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          Code Search

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                      <span class="d-block h4 color-fg-default my-1" id="platform-integrations-heading">Integrations</span>

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      GitHub Marketplace

    
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      MCP Registry

    
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              View all features
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        Solutions
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                <div class="border-bottom border-lg-bottom-0 pb-lg-0 pb-3">

                      <span class="d-block h4 color-fg-default my-1" id="solutions-by-company-size-heading">By company size</span>

                  <ul class="list-style-none f5" aria-labelledby="solutions-by-company-size-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;enterprises&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;enterprises_link_solutions_navbar&quot;}" href="https://github.com/enterprise">
      Enterprises

    
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                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;small_and_medium_teams&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;small_and_medium_teams_link_solutions_navbar&quot;}" href="https://github.com/team">
      Small and medium teams

    
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  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;startups&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;startups_link_solutions_navbar&quot;}" href="https://github.com/enterprise/startups">
      Startups

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;nonprofits&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;nonprofits_link_solutions_navbar&quot;}" href="/solutions/industry/nonprofits">
      Nonprofits

    
</a></li>

                  </ul>
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            <div class="HeaderMenu-column px-lg-4 pb-3 pb-lg-0 border-lg-right">
                <div class="border-bottom border-lg-bottom-0 pb-lg-0 pb-3">

                      <span class="d-block h4 color-fg-default my-1" id="solutions-by-use-case-heading">By use case</span>

                  <ul class="list-style-none f5" aria-labelledby="solutions-by-use-case-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;app_modernization&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;app_modernization_link_solutions_navbar&quot;}" href="/solutions/use-case/app-modernization">
      App Modernization

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;devsecops&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;devsecops_link_solutions_navbar&quot;}" href="/solutions/use-case/devsecops">
      DevSecOps

    
</a></li>

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  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;devops&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;devops_link_solutions_navbar&quot;}" href="/solutions/use-case/devops">
      DevOps

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;ci_cd&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;ci_cd_link_solutions_navbar&quot;}" href="/solutions/use-case/ci-cd">
      CI/CD

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;view_all_use_cases&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;view_all_use_cases_link_solutions_navbar&quot;}" href="/solutions/use-case">
      View all use cases

    
</a></li>

                  </ul>
                </div>
            </div>
            <div class="HeaderMenu-column px-lg-4">
                <div class="border-bottom border-lg-bottom-0 pb-lg-0 pb-3">

                      <span class="d-block h4 color-fg-default my-1" id="solutions-by-industry-heading">By industry</span>

                  <ul class="list-style-none f5" aria-labelledby="solutions-by-industry-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;healthcare&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;healthcare_link_solutions_navbar&quot;}" href="/solutions/industry/healthcare">
      Healthcare

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;financial_services&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;financial_services_link_solutions_navbar&quot;}" href="/solutions/industry/financial-services">
      Financial services

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;manufacturing&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;manufacturing_link_solutions_navbar&quot;}" href="/solutions/industry/manufacturing">
      Manufacturing

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;government&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;government_link_solutions_navbar&quot;}" href="/solutions/industry/government">
      Government

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;view_all_industries&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;view_all_industries_link_solutions_navbar&quot;}" href="/solutions/industry">
      View all industries

    
</a></li>

                  </ul>
                </div>
            </div>
        </div>

          <div class="HeaderMenu-trailing-link rounded-bottom-2 mt-lg-4 px-lg-4 py-4 py-lg-3 f5 text-semibold">
            <a data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;view_all_solutions&quot;,&quot;context&quot;:&quot;solutions&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;view_all_solutions_link_solutions_navbar&quot;}" href="/solutions">
              View all solutions
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-right HeaderMenu-trailing-link-icon">
    <path d="M6.22 3.22a.75.75 0 0 1 1.06 0l4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L9.94 8 6.22 4.28a.75.75 0 0 1 0-1.06Z"></path>
</svg>
</a>          </div>
      </div>
</li>


                <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item">
      <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false">
        Resources
        <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1">
    <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path>
</svg>
      </button>

      <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4 dropdown-menu-wide">
        <div class="d-lg-flex dropdown-menu-wide">
            <div class="HeaderMenu-column px-lg-4 pb-3 pb-lg-0 border-lg-right">
                <div class="border-bottom border-lg-bottom-0 pb-lg-0 pb-3">

                      <span class="d-block h4 color-fg-default my-1" id="resources-topics-heading">Topics</span>

                  <ul class="list-style-none f5" aria-labelledby="resources-topics-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;ai&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;ai_link_resources_navbar&quot;}" href="/resources/articles/ai">
      AI

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;devops&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;devops_link_resources_navbar&quot;}" href="/resources/articles/devops">
      DevOps

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;security&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;security_link_resources_navbar&quot;}" href="/resources/articles/security">
      Security

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;software_development&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;software_development_link_resources_navbar&quot;}" href="/resources/articles/software-development">
      Software Development

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;view_all&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;view_all_link_resources_navbar&quot;}" href="/resources/articles">
      View all

    
</a></li>

                  </ul>
                </div>
            </div>
            <div class="HeaderMenu-column px-lg-4">
                <div class="border-bottom border-lg-bottom-0 pb-lg-0 border-bottom-0">

                      <span class="d-block h4 color-fg-default my-1" id="resources-explore-heading">Explore</span>

                  <ul class="list-style-none f5" aria-labelledby="resources-explore-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary Link--external" target="_blank" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;learning_pathways&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;learning_pathways_link_resources_navbar&quot;}" href="https://resources.github.com/learn/pathways">
      Learning Pathways

    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-link-external HeaderMenu-external-icon color-fg-subtle">
    <path d="M3.75 2h3.5a.75.75 0 0 1 0 1.5h-3.5a.25.25 0 0 0-.25.25v8.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-3.5a.75.75 0 0 1 1.5 0v3.5A1.75 1.75 0 0 1 12.25 14h-8.5A1.75 1.75 0 0 1 2 12.25v-8.5C2 2.784 2.784 2 3.75 2Zm6.854-1h4.146a.25.25 0 0 1 .25.25v4.146a.25.25 0 0 1-.427.177L13.03 4.03 9.28 7.78a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042l3.75-3.75-1.543-1.543A.25.25 0 0 1 10.604 1Z"></path>
</svg>
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;events_amp_webinars&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;events_amp_webinars_link_resources_navbar&quot;}" href="https://github.com/resources/events">
      Events &amp; Webinars

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;ebooks_amp_whitepapers&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;ebooks_amp_whitepapers_link_resources_navbar&quot;}" href="https://github.com/resources/whitepapers">
      Ebooks &amp; Whitepapers

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;customer_stories&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;customer_stories_link_resources_navbar&quot;}" href="https://github.com/customer-stories">
      Customer Stories

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;partners&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;partners_link_resources_navbar&quot;}" href="https://github.com/partners">
      Partners

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;executive_insights&quot;,&quot;context&quot;:&quot;resources&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;executive_insights_link_resources_navbar&quot;}" href="https://github.com/solutions/executive-insights">
      Executive Insights

    
</a></li>

                  </ul>
                </div>
            </div>
        </div>

      </div>
</li>


                <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item">
      <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false">
        Open Source
        <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1">
    <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path>
</svg>
      </button>

      <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4">
        <div class="d-lg-flex dropdown-menu-wide">
            <div class="HeaderMenu-column px-lg-4">
                <div class="border-bottom mb-3 mb-lg-3 pb-3">

                  <ul class="list-style-none f5" >
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;github_sponsors&quot;,&quot;context&quot;:&quot;open_source&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;github_sponsors_link_open_source_navbar&quot;}" href="/sponsors">
      
      <div>
        <div class="color-fg-default h4">
          GitHub Sponsors

        </div>

        Fund open source developers
      </div>

    
</a></li>

                  </ul>
                </div>
                <div class="border-bottom mb-3 mb-lg-3 pb-3">

                  <ul class="list-style-none f5" >
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;the_readme_project&quot;,&quot;context&quot;:&quot;open_source&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;the_readme_project_link_open_source_navbar&quot;}" href="https://github.com/readme">
      
      <div>
        <div class="color-fg-default h4">
          The ReadME Project

        </div>

        GitHub community articles
      </div>

    
</a></li>

                  </ul>
                </div>
                <div class="border-bottom border-bottom-0">

                      <span class="d-block h4 color-fg-default my-1" id="open-source-repositories-heading">Repositories</span>

                  <ul class="list-style-none f5" aria-labelledby="open-source-repositories-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;topics&quot;,&quot;context&quot;:&quot;open_source&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;topics_link_open_source_navbar&quot;}" href="https://github.com/topics">
      Topics

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;trending&quot;,&quot;context&quot;:&quot;open_source&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;trending_link_open_source_navbar&quot;}" href="https://github.com/trending">
      Trending

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;collections&quot;,&quot;context&quot;:&quot;open_source&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;collections_link_open_source_navbar&quot;}" href="https://github.com/collections">
      Collections

    
</a></li>

                  </ul>
                </div>
            </div>
        </div>

      </div>
</li>


                <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item">
      <button type="button" class="HeaderMenu-link border-0 width-full width-lg-auto px-0 px-lg-2 py-lg-2 no-wrap d-flex flex-items-center flex-justify-between js-details-target" aria-expanded="false">
        Enterprise
        <svg opacity="0.5" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-chevron-down HeaderMenu-icon ml-1">
    <path d="M12.78 5.22a.749.749 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.06 0L3.22 6.28a.749.749 0 1 1 1.06-1.06L8 8.939l3.72-3.719a.749.749 0 0 1 1.06 0Z"></path>
</svg>
      </button>

      <div class="HeaderMenu-dropdown dropdown-menu rounded m-0 p-0 pt-2 pt-lg-4 position-relative position-lg-absolute left-0 left-lg-n3 pb-2 pb-lg-4">
        <div class="d-lg-flex dropdown-menu-wide">
            <div class="HeaderMenu-column px-lg-4">
                <div class="border-bottom mb-3 mb-lg-3 pb-3">

                  <ul class="list-style-none f5" >
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;enterprise_platform&quot;,&quot;context&quot;:&quot;enterprise&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;enterprise_platform_link_enterprise_navbar&quot;}" href="/enterprise">
      <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-stack color-fg-subtle mr-3">
    <path d="M11.063 1.456a1.749 1.749 0 0 1 1.874 0l8.383 5.316a1.751 1.751 0 0 1 0 2.956l-8.383 5.316a1.749 1.749 0 0 1-1.874 0L2.68 9.728a1.751 1.751 0 0 1 0-2.956Zm1.071 1.267a.25.25 0 0 0-.268 0L3.483 8.039a.25.25 0 0 0 0 .422l8.383 5.316a.25.25 0 0 0 .268 0l8.383-5.316a.25.25 0 0 0 0-.422Z"></path><path d="M1.867 12.324a.75.75 0 0 1 1.035-.232l8.964 5.685a.25.25 0 0 0 .268 0l8.964-5.685a.75.75 0 0 1 .804 1.267l-8.965 5.685a1.749 1.749 0 0 1-1.874 0l-8.965-5.685a.75.75 0 0 1-.231-1.035Z"></path><path d="M1.867 16.324a.75.75 0 0 1 1.035-.232l8.964 5.685a.25.25 0 0 0 .268 0l8.964-5.685a.75.75 0 0 1 .804 1.267l-8.965 5.685a1.749 1.749 0 0 1-1.874 0l-8.965-5.685a.75.75 0 0 1-.231-1.035Z"></path>
</svg>
      <div>
        <div class="color-fg-default h4">
          Enterprise platform

        </div>

        AI-powered developer platform
      </div>

    
</a></li>

                  </ul>
                </div>
                <div class="border-bottom border-bottom-0">

                      <span class="d-block h4 color-fg-default my-1" id="enterprise-available-add-ons-heading">Available add-ons</span>

                  <ul class="list-style-none f5" aria-labelledby="enterprise-available-add-ons-heading">
                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description mb-lg-3" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;github_advanced_security&quot;,&quot;context&quot;:&quot;enterprise&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;github_advanced_security_link_enterprise_navbar&quot;}" href="https://github.com/security/advanced-security">
      <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3">
    <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path>
</svg>
      <div>
        <div class="color-fg-default h4">
          GitHub Advanced Security

        </div>

        Enterprise-grade security features
      </div>

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description mb-lg-3" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;copilot_for_business&quot;,&quot;context&quot;:&quot;enterprise&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;copilot_for_business_link_enterprise_navbar&quot;}" href="/features/copilot/copilot-business">
      <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-copilot color-fg-subtle mr-3">
    <path d="M23.922 16.992c-.861 1.495-5.859 5.023-11.922 5.023-6.063 0-11.061-3.528-11.922-5.023A.641.641 0 0 1 0 16.736v-2.869a.841.841 0 0 1 .053-.22c.372-.935 1.347-2.292 2.605-2.656.167-.429.414-1.055.644-1.517a10.195 10.195 0 0 1-.052-1.086c0-1.331.282-2.499 1.132-3.368.397-.406.89-.717 1.474-.952 1.399-1.136 3.392-2.093 6.122-2.093 2.731 0 4.767.957 6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path>
</svg>
      <div>
        <div class="color-fg-default h4">
          Copilot for business

        </div>

        Enterprise-grade AI features
      </div>

    
</a></li>

                      <li>
  <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;premium_support&quot;,&quot;context&quot;:&quot;enterprise&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;premium_support_link_enterprise_navbar&quot;}" href="/premium-support">
      <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-comment-discussion color-fg-subtle mr-3">
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</svg>
      <div>
        <div class="color-fg-default h4">
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        Enterprise-grade 24/7 support
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</a></li>

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</li>


                <li class="HeaderMenu-item position-relative flex-wrap flex-justify-between flex-items-center d-block d-lg-flex flex-lg-nowrap flex-lg-items-center js-details-container js-header-menu-item">
    <a class="HeaderMenu-link no-underline px-0 px-lg-2 py-3 py-lg-2 d-block d-lg-inline-block" data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;platform&quot;,&quot;context&quot;:&quot;global&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;platform_link_global_navbar&quot;}" href="https://github.com/pricing">Pricing</a>
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        <div class="d-flex flex-column flex-lg-row width-full flex-justify-end flex-lg-items-center text-center mt-3 mt-lg-0 text-lg-left ml-lg-3">
                


<qbsearch-input class="search-input" data-scope="repo:cplusplus/draft" data-custom-scopes-path="/search/custom_scopes" data-delete-custom-scopes-csrf="ncQW6Jg3acBRjUHIaxHbeBa1PKJbzUqStToOlbN7IGvVYnxJ38N-ILozM1kHPruVeSNzCsRjowKULjDcBWr6Cg" data-max-custom-scopes="10" data-header-redesign-enabled="false" data-initial-value="" data-blackbird-suggestions-path="/search/suggestions" data-jump-to-suggestions-path="/_graphql/GetSuggestedNavigationDestinations" data-current-repository="cplusplus/draft" data-current-org="cplusplus" data-current-owner="" data-logged-in="false" data-copilot-chat-enabled="false" data-nl-search-enabled="false" data-retain-scroll-position="true">
  <div
    class="search-input-container search-with-dialog position-relative d-flex flex-row flex-items-center mr-4 rounded"
    data-action="click:qbsearch-input#searchInputContainerClicked"
  >
      <button
        type="button"
        class="header-search-button placeholder  input-button form-control d-flex flex-1 flex-self-stretch flex-items-center no-wrap width-full py-0 pl-2 pr-0 text-left border-0 box-shadow-none"
        data-target="qbsearch-input.inputButton"
        aria-label="Search or jump to…"
        aria-haspopup="dialog"
        placeholder="Search or jump to..."
        data-hotkey=s,/
        autocapitalize="off"
        data-analytics-event="{&quot;location&quot;:&quot;navbar&quot;,&quot;action&quot;:&quot;searchbar&quot;,&quot;context&quot;:&quot;global&quot;,&quot;tag&quot;:&quot;input&quot;,&quot;label&quot;:&quot;searchbar_input_global_navbar&quot;}"
        data-action="click:qbsearch-input#handleExpand"
      >
        <div class="mr-2 color-fg-muted">
          <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-search">
    <path d="M10.68 11.74a6 6 0 0 1-7.922-8.982 6 6 0 0 1 8.982 7.922l3.04 3.04a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215ZM11.5 7a4.499 4.499 0 1 0-8.997 0A4.499 4.499 0 0 0 11.5 7Z"></path>
</svg>
        </div>
        <span class="flex-1" data-target="qbsearch-input.inputButtonText">Search or jump to...</span>
          <div class="d-flex" data-target="qbsearch-input.hotkeyIndicator">
            <svg xmlns="http://www.w3.org/2000/svg" width="22" height="20" aria-hidden="true" class="mr-1"><path fill="none" stroke="#979A9C" opacity=".4" d="M3.5.5h12c1.7 0 3 1.3 3 3v13c0 1.7-1.3 3-3 3h-12c-1.7 0-3-1.3-3-3v-13c0-1.7 1.3-3 3-3z"></path><path fill="#979A9C" d="M11.8 6L8 15.1h-.9L10.8 6h1z"></path></svg>
          </div>
      </button>

    <input type="hidden" name="type" class="js-site-search-type-field">

    
<div class="Overlay--hidden " data-modal-dialog-overlay>
  <modal-dialog data-action="close:qbsearch-input#handleClose cancel:qbsearch-input#handleClose" data-target="qbsearch-input.searchSuggestionsDialog" role="dialog" id="search-suggestions-dialog" aria-modal="true" aria-labelledby="search-suggestions-dialog-header" data-view-component="true" class="Overlay Overlay--width-large Overlay--height-auto">
      <h1 id="search-suggestions-dialog-header" class="sr-only">Search code, repositories, users, issues, pull requests...</h1>
    <div class="Overlay-body Overlay-body--paddingNone">
      
          <div data-view-component="true">        <div class="search-suggestions position-fixed width-full color-shadow-large border color-fg-default color-bg-default overflow-hidden d-flex flex-column query-builder-container"
          style="border-radius: 12px;"
          data-target="qbsearch-input.queryBuilderContainer"
          hidden
        >
          <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="query-builder-test-form" action="" accept-charset="UTF-8" method="get">
  <query-builder data-target="qbsearch-input.queryBuilder" id="query-builder-query-builder-test" data-filter-key=":" data-view-component="true" class="QueryBuilder search-query-builder">
    <div class="FormControl FormControl--fullWidth">
      <label id="query-builder-test-label" for="query-builder-test" class="FormControl-label sr-only">
        Search
      </label>
      <div
        class="QueryBuilder-StyledInput width-fit "
        data-target="query-builder.styledInput"
      >
          <span id="query-builder-test-leadingvisual-wrap" class="FormControl-input-leadingVisualWrap QueryBuilder-leadingVisualWrap">
            <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-search FormControl-input-leadingVisual">
    <path d="M10.68 11.74a6 6 0 0 1-7.922-8.982 6 6 0 0 1 8.982 7.922l3.04 3.04a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215ZM11.5 7a4.499 4.499 0 1 0-8.997 0A4.499 4.499 0 0 0 11.5 7Z"></path>
</svg>
          </span>
        <div data-target="query-builder.styledInputContainer" class="QueryBuilder-StyledInputContainer">
          <div
            aria-hidden="true"
            class="QueryBuilder-StyledInputContent"
            data-target="query-builder.styledInputContent"
          ></div>
          <div class="QueryBuilder-InputWrapper">
            <div aria-hidden="true" class="QueryBuilder-Sizer" data-target="query-builder.sizer"></div>
            <input id="query-builder-test" name="query-builder-test" value="" autocomplete="off" type="text" role="combobox" spellcheck="false" aria-expanded="false" aria-describedby="validation-53cc7eb8-40cd-4bbf-b9aa-d841fb16cb7d" data-target="query-builder.input" data-action="
          input:query-builder#inputChange
          blur:query-builder#inputBlur
          keydown:query-builder#inputKeydown
          focus:query-builder#inputFocus
        " data-view-component="true" class="FormControl-input QueryBuilder-Input FormControl-medium" />
          </div>
        </div>
          <span class="sr-only" id="query-builder-test-clear">Clear</span>
          <button role="button" id="query-builder-test-clear-button" aria-labelledby="query-builder-test-clear query-builder-test-label" data-target="query-builder.clearButton" data-action="
                click:query-builder#clear
                focus:query-builder#clearButtonFocus
                blur:query-builder#clearButtonBlur
              " variant="small" hidden="hidden" type="button" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium mr-1 px-2 py-0 d-flex flex-items-center rounded-1 color-fg-muted">  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x-circle-fill Button-visual">
    <path d="M2.343 13.657A8 8 0 1 1 13.658 2.343 8 8 0 0 1 2.343 13.657ZM6.03 4.97a.751.751 0 0 0-1.042.018.751.751 0 0 0-.018 1.042L6.94 8 4.97 9.97a.749.749 0 0 0 .326 1.275.749.749 0 0 0 .734-.215L8 9.06l1.97 1.97a.749.749 0 0 0 1.275-.326.749.749 0 0 0-.215-.734L9.06 8l1.97-1.97a.749.749 0 0 0-.326-1.275.749.749 0 0 0-.734.215L8 6.94Z"></path>
</svg>
</button>

      </div>
      <template id="search-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-search">
    <path d="M10.68 11.74a6 6 0 0 1-7.922-8.982 6 6 0 0 1 8.982 7.922l3.04 3.04a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215ZM11.5 7a4.499 4.499 0 1 0-8.997 0A4.499 4.499 0 0 0 11.5 7Z"></path>
</svg>
</template>

<template id="code-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code">
    <path d="m11.28 3.22 4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734L13.94 8l-3.72-3.72a.749.749 0 0 1 .326-1.275.749.749 0 0 1 .734.215Zm-6.56 0a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042L2.06 8l3.72 3.72a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L.47 8.53a.75.75 0 0 1 0-1.06Z"></path>
</svg>
</template>

<template id="file-code-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-file-code">
    <path d="M4 1.75C4 .784 4.784 0 5.75 0h5.586c.464 0 .909.184 1.237.513l2.914 2.914c.329.328.513.773.513 1.237v8.586A1.75 1.75 0 0 1 14.25 15h-9a.75.75 0 0 1 0-1.5h9a.25.25 0 0 0 .25-.25V6h-2.75A1.75 1.75 0 0 1 10 4.25V1.5H5.75a.25.25 0 0 0-.25.25v2.5a.75.75 0 0 1-1.5 0Zm1.72 4.97a.75.75 0 0 1 1.06 0l2 2a.75.75 0 0 1 0 1.06l-2 2a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734l1.47-1.47-1.47-1.47a.75.75 0 0 1 0-1.06ZM3.28 7.78 1.81 9.25l1.47 1.47a.751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018l-2-2a.75.75 0 0 1 0-1.06l2-2a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042Zm8.22-6.218V4.25c0 .138.112.25.25.25h2.688l-.011-.013-2.914-2.914-.013-.011Z"></path>
</svg>
</template>

<template id="history-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-history">
    <path d="m.427 1.927 1.215 1.215a8.002 8.002 0 1 1-1.6 5.685.75.75 0 1 1 1.493-.154 6.5 6.5 0 1 0 1.18-4.458l1.358 1.358A.25.25 0 0 1 3.896 6H.25A.25.25 0 0 1 0 5.75V2.104a.25.25 0 0 1 .427-.177ZM7.75 4a.75.75 0 0 1 .75.75v2.992l2.028.812a.75.75 0 0 1-.557 1.392l-2.5-1A.751.751 0 0 1 7 8.25v-3.5A.75.75 0 0 1 7.75 4Z"></path>
</svg>
</template>

<template id="repo-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo">
    <path d="M2 2.5A2.5 2.5 0 0 1 4.5 0h8.75a.75.75 0 0 1 .75.75v12.5a.75.75 0 0 1-.75.75h-2.5a.75.75 0 0 1 0-1.5h1.75v-2h-8a1 1 0 0 0-.714 1.7.75.75 0 1 1-1.072 1.05A2.495 2.495 0 0 1 2 11.5Zm10.5-1h-8a1 1 0 0 0-1 1v6.708A2.486 2.486 0 0 1 4.5 9h8ZM5 12.25a.25.25 0 0 1 .25-.25h3.5a.25.25 0 0 1 .25.25v3.25a.25.25 0 0 1-.4.2l-1.45-1.087a.249.249 0 0 0-.3 0L5.4 15.7a.25.25 0 0 1-.4-.2Z"></path>
</svg>
</template>

<template id="bookmark-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-bookmark">
    <path d="M3 2.75C3 1.784 3.784 1 4.75 1h6.5c.966 0 1.75.784 1.75 1.75v11.5a.75.75 0 0 1-1.227.579L8 11.722l-3.773 3.107A.751.751 0 0 1 3 14.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.91l3.023-2.489a.75.75 0 0 1 .954 0l3.023 2.49V2.75a.25.25 0 0 0-.25-.25Z"></path>
</svg>
</template>

<template id="plus-circle-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-plus-circle">
    <path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Zm7.25-3.25v2.5h2.5a.75.75 0 0 1 0 1.5h-2.5v2.5a.75.75 0 0 1-1.5 0v-2.5h-2.5a.75.75 0 0 1 0-1.5h2.5v-2.5a.75.75 0 0 1 1.5 0Z"></path>
</svg>
</template>

<template id="circle-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-dot-fill">
    <path d="M8 4a4 4 0 1 1 0 8 4 4 0 0 1 0-8Z"></path>
</svg>
</template>

<template id="trash-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-trash">
    <path d="M11 1.75V3h2.25a.75.75 0 0 1 0 1.5H2.75a.75.75 0 0 1 0-1.5H5V1.75C5 .784 5.784 0 6.75 0h2.5C10.216 0 11 .784 11 1.75ZM4.496 6.675l.66 6.6a.25.25 0 0 0 .249.225h5.19a.25.25 0 0 0 .249-.225l.66-6.6a.75.75 0 0 1 1.492.149l-.66 6.6A1.748 1.748 0 0 1 10.595 15h-5.19a1.75 1.75 0 0 1-1.741-1.575l-.66-6.6a.75.75 0 1 1 1.492-.15ZM6.5 1.75V3h3V1.75a.25.25 0 0 0-.25-.25h-2.5a.25.25 0 0 0-.25.25Z"></path>
</svg>
</template>

<template id="team-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-people">
    <path d="M2 5.5a3.5 3.5 0 1 1 5.898 2.549 5.508 5.508 0 0 1 3.034 4.084.75.75 0 1 1-1.482.235 4 4 0 0 0-7.9 0 .75.75 0 0 1-1.482-.236A5.507 5.507 0 0 1 3.102 8.05 3.493 3.493 0 0 1 2 5.5ZM11 4a3.001 3.001 0 0 1 2.22 5.018 5.01 5.01 0 0 1 2.56 3.012.749.749 0 0 1-.885.954.752.752 0 0 1-.549-.514 3.507 3.507 0 0 0-2.522-2.372.75.75 0 0 1-.574-.73v-.352a.75.75 0 0 1 .416-.672A1.5 1.5 0 0 0 11 5.5.75.75 0 0 1 11 4Zm-5.5-.5a2 2 0 1 0-.001 3.999A2 2 0 0 0 5.5 3.5Z"></path>
</svg>
</template>

<template id="project-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-project">
    <path d="M1.75 0h12.5C15.216 0 16 .784 16 1.75v12.5A1.75 1.75 0 0 1 14.25 16H1.75A1.75 1.75 0 0 1 0 14.25V1.75C0 .784.784 0 1.75 0ZM1.5 1.75v12.5c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25V1.75a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25ZM11.75 3a.75.75 0 0 1 .75.75v7.5a.75.75 0 0 1-1.5 0v-7.5a.75.75 0 0 1 .75-.75Zm-8.25.75a.75.75 0 0 1 1.5 0v5.5a.75.75 0 0 1-1.5 0ZM8 3a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 3Z"></path>
</svg>
</template>

<template id="pencil-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-pencil">
    <path d="M11.013 1.427a1.75 1.75 0 0 1 2.474 0l1.086 1.086a1.75 1.75 0 0 1 0 2.474l-8.61 8.61c-.21.21-.47.364-.756.445l-3.251.93a.75.75 0 0 1-.927-.928l.929-3.25c.081-.286.235-.547.445-.758l8.61-8.61Zm.176 4.823L9.75 4.81l-6.286 6.287a.253.253 0 0 0-.064.108l-.558 1.953 1.953-.558a.253.253 0 0 0 .108-.064Zm1.238-3.763a.25.25 0 0 0-.354 0L10.811 3.75l1.439 1.44 1.263-1.263a.25.25 0 0 0 0-.354Z"></path>
</svg>
</template>

<template id="copilot-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copilot">
    <path d="M7.998 15.035c-4.562 0-7.873-2.914-7.998-3.749V9.338c.085-.628.677-1.686 1.588-2.065.013-.07.024-.143.036-.218.029-.183.06-.384.126-.612-.201-.508-.254-1.084-.254-1.656 0-.87.128-1.769.693-2.484.579-.733 1.494-1.124 2.724-1.261 1.206-.134 2.262.034 2.944.765.05.053.096.108.139.165.044-.057.094-.112.143-.165.682-.731 1.738-.899 2.944-.765 1.23.137 2.145.528 2.724 1.261.566.715.693 1.614.693 2.484 0 .572-.053 1.148-.254 1.656.066.228.098.429.126.612.012.076.024.148.037.218.924.385 1.522 1.471 1.591 2.095v1.872c0 .766-3.351 3.795-8.002 3.795Zm0-1.485c2.28 0 4.584-1.11 5.002-1.433V7.862l-.023-.116c-.49.21-1.075.291-1.727.291-1.146 0-2.059-.327-2.71-.991A3.222 3.222 0 0 1 8 6.303a3.24 3.24 0 0 1-.544.743c-.65.664-1.563.991-2.71.991-.652 0-1.236-.081-1.727-.291l-.023.116v4.255c.419.323 2.722 1.433 5.002 1.433ZM6.762 2.83c-.193-.206-.637-.413-1.682-.297-1.019.113-1.479.404-1.713.7-.247.312-.369.789-.369 1.554 0 .793.129 1.171.308 1.371.162.181.519.379 1.442.379.853 0 1.339-.235 1.638-.54.315-.322.527-.827.617-1.553.117-.935-.037-1.395-.241-1.614Zm4.155-.297c-1.044-.116-1.488.091-1.681.297-.204.219-.359.679-.242 1.614.091.726.303 1.231.618 1.553.299.305.784.54 1.638.54.922 0 1.28-.198 1.442-.379.179-.2.308-.578.308-1.371 0-.765-.123-1.242-.37-1.554-.233-.296-.693-.587-1.713-.7Z"></path><path d="M6.25 9.037a.75.75 0 0 1 .75.75v1.501a.75.75 0 0 1-1.5 0V9.787a.75.75 0 0 1 .75-.75Zm4.25.75v1.501a.75.75 0 0 1-1.5 0V9.787a.75.75 0 0 1 1.5 0Z"></path>
</svg>
</template>

<template id="copilot-error-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copilot-error">
    <path d="M16 11.24c0 .112-.072.274-.21.467L13 9.688V7.862l-.023-.116c-.49.21-1.075.291-1.727.291-.198 0-.388-.009-.571-.029L6.833 5.226a4.01 4.01 0 0 0 .17-.782c.117-.935-.037-1.395-.241-1.614-.193-.206-.637-.413-1.682-.297-.683.076-1.115.231-1.395.415l-1.257-.91c.579-.564 1.413-.877 2.485-.996 1.206-.134 2.262.034 2.944.765.05.053.096.108.139.165.044-.057.094-.112.143-.165.682-.731 1.738-.899 2.944-.765 1.23.137 2.145.528 2.724 1.261.566.715.693 1.614.693 2.484 0 .572-.053 1.148-.254 1.656.066.228.098.429.126.612.012.076.024.148.037.218.924.385 1.522 1.471 1.591 2.095Zm-5.083-8.707c-1.044-.116-1.488.091-1.681.297-.204.219-.359.679-.242 1.614.091.726.303 1.231.618 1.553.299.305.784.54 1.638.54.922 0 1.28-.198 1.442-.379.179-.2.308-.578.308-1.371 0-.765-.123-1.242-.37-1.554-.233-.296-.693-.587-1.713-.7Zm2.511 11.074c-1.393.776-3.272 1.428-5.43 1.428-4.562 0-7.873-2.914-7.998-3.749V9.338c.085-.628.677-1.686 1.588-2.065.013-.07.024-.143.036-.218.029-.183.06-.384.126-.612-.18-.455-.241-.963-.252-1.475L.31 4.107A.747.747 0 0 1 0 3.509V3.49a.748.748 0 0 1 .625-.73c.156-.026.306.047.435.139l14.667 10.578a.592.592 0 0 1 .227.264.752.752 0 0 1 .046.249v.022a.75.75 0 0 1-1.19.596Zm-1.367-.991L5.635 7.964a5.128 5.128 0 0 1-.889.073c-.652 0-1.236-.081-1.727-.291l-.023.116v4.255c.419.323 2.722 1.433 5.002 1.433 1.539 0 3.089-.505 4.063-.934Z"></path>
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</template>

<template id="workflow-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-workflow">
    <path d="M0 1.75C0 .784.784 0 1.75 0h3.5C6.216 0 7 .784 7 1.75v3.5A1.75 1.75 0 0 1 5.25 7H4v4a1 1 0 0 0 1 1h4v-1.25C9 9.784 9.784 9 10.75 9h3.5c.966 0 1.75.784 1.75 1.75v3.5A1.75 1.75 0 0 1 14.25 16h-3.5A1.75 1.75 0 0 1 9 14.25v-.75H5A2.5 2.5 0 0 1 2.5 11V7h-.75A1.75 1.75 0 0 1 0 5.25Zm1.75-.25a.25.25 0 0 0-.25.25v3.5c0 .138.112.25.25.25h3.5a.25.25 0 0 0 .25-.25v-3.5a.25.25 0 0 0-.25-.25Zm9 9a.25.25 0 0 0-.25.25v3.5c0 .138.112.25.25.25h3.5a.25.25 0 0 0 .25-.25v-3.5a.25.25 0 0 0-.25-.25Z"></path>
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</template>

<template id="book-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-book">
    <path d="M0 1.75A.75.75 0 0 1 .75 1h4.253c1.227 0 2.317.59 3 1.501A3.743 3.743 0 0 1 11.006 1h4.245a.75.75 0 0 1 .75.75v10.5a.75.75 0 0 1-.75.75h-4.507a2.25 2.25 0 0 0-1.591.659l-.622.621a.75.75 0 0 1-1.06 0l-.622-.621A2.25 2.25 0 0 0 5.258 13H.75a.75.75 0 0 1-.75-.75Zm7.251 10.324.004-5.073-.002-2.253A2.25 2.25 0 0 0 5.003 2.5H1.5v9h3.757a3.75 3.75 0 0 1 1.994.574ZM8.755 4.75l-.004 7.322a3.752 3.752 0 0 1 1.992-.572H14.5v-9h-3.495a2.25 2.25 0 0 0-2.25 2.25Z"></path>
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</template>

<template id="code-review-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code-review">
    <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 13H8.061l-2.574 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25v-8.5C0 1.784.784 1 1.75 1ZM1.5 2.75v8.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-8.5a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Zm5.28 1.72a.75.75 0 0 1 0 1.06L5.31 7l1.47 1.47a.751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018l-2-2a.75.75 0 0 1 0-1.06l2-2a.75.75 0 0 1 1.06 0Zm2.44 0a.75.75 0 0 1 1.06 0l2 2a.75.75 0 0 1 0 1.06l-2 2a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L10.69 7 9.22 5.53a.75.75 0 0 1 0-1.06Z"></path>
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</template>

<template id="codespaces-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-codespaces">
    <path d="M0 11.25c0-.966.784-1.75 1.75-1.75h12.5c.966 0 1.75.784 1.75 1.75v3A1.75 1.75 0 0 1 14.25 16H1.75A1.75 1.75 0 0 1 0 14.25Zm2-9.5C2 .784 2.784 0 3.75 0h8.5C13.216 0 14 .784 14 1.75v5a1.75 1.75 0 0 1-1.75 1.75h-8.5A1.75 1.75 0 0 1 2 6.75Zm1.75-.25a.25.25 0 0 0-.25.25v5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25v-5a.25.25 0 0 0-.25-.25Zm-2 9.5a.25.25 0 0 0-.25.25v3c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-3a.25.25 0 0 0-.25-.25Z"></path><path d="M7 12.75a.75.75 0 0 1 .75-.75h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1-.75-.75Zm-4 0a.75.75 0 0 1 .75-.75h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1-.75-.75Z"></path>
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</template>

<template id="comment-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-comment">
    <path d="M1 2.75C1 1.784 1.784 1 2.75 1h10.5c.966 0 1.75.784 1.75 1.75v7.5A1.75 1.75 0 0 1 13.25 12H9.06l-2.573 2.573A1.458 1.458 0 0 1 4 13.543V12H2.75A1.75 1.75 0 0 1 1 10.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h4.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
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</template>

<template id="comment-discussion-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-comment-discussion">
    <path d="M1.75 1h8.5c.966 0 1.75.784 1.75 1.75v5.5A1.75 1.75 0 0 1 10.25 10H7.061l-2.574 2.573A1.458 1.458 0 0 1 2 11.543V10h-.25A1.75 1.75 0 0 1 0 8.25v-5.5C0 1.784.784 1 1.75 1ZM1.5 2.75v5.5c0 .138.112.25.25.25h1a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h3.5a.25.25 0 0 0 .25-.25v-5.5a.25.25 0 0 0-.25-.25h-8.5a.25.25 0 0 0-.25.25Zm13 2a.25.25 0 0 0-.25-.25h-.5a.75.75 0 0 1 0-1.5h.5c.966 0 1.75.784 1.75 1.75v5.5A1.75 1.75 0 0 1 14.25 12H14v1.543a1.458 1.458 0 0 1-2.487 1.03L9.22 12.28a.749.749 0 0 1 .326-1.275.749.749 0 0 1 .734.215l2.22 2.22v-2.19a.75.75 0 0 1 .75-.75h1a.25.25 0 0 0 .25-.25Z"></path>
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</template>

<template id="organization-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-organization">
    <path d="M1.75 16A1.75 1.75 0 0 1 0 14.25V1.75C0 .784.784 0 1.75 0h8.5C11.216 0 12 .784 12 1.75v12.5c0 .085-.006.168-.018.25h2.268a.25.25 0 0 0 .25-.25V8.285a.25.25 0 0 0-.111-.208l-1.055-.703a.749.749 0 1 1 .832-1.248l1.055.703c.487.325.779.871.779 1.456v5.965A1.75 1.75 0 0 1 14.25 16h-3.5a.766.766 0 0 1-.197-.026c-.099.017-.2.026-.303.026h-3a.75.75 0 0 1-.75-.75V14h-1v1.25a.75.75 0 0 1-.75.75Zm-.25-1.75c0 .138.112.25.25.25H4v-1.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 .75.75v1.25h2.25a.25.25 0 0 0 .25-.25V1.75a.25.25 0 0 0-.25-.25h-8.5a.25.25 0 0 0-.25.25ZM3.75 6h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1 0-1.5ZM3 3.75A.75.75 0 0 1 3.75 3h.5a.75.75 0 0 1 0 1.5h-.5A.75.75 0 0 1 3 3.75Zm4 3A.75.75 0 0 1 7.75 6h.5a.75.75 0 0 1 0 1.5h-.5A.75.75 0 0 1 7 6.75ZM7.75 3h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1 0-1.5ZM3 9.75A.75.75 0 0 1 3.75 9h.5a.75.75 0 0 1 0 1.5h-.5A.75.75 0 0 1 3 9.75ZM7.75 9h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1 0-1.5Z"></path>
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<template id="rocket-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-rocket">
    <path d="M14.064 0h.186C15.216 0 16 .784 16 1.75v.186a8.752 8.752 0 0 1-2.564 6.186l-.458.459c-.314.314-.641.616-.979.904v3.207c0 .608-.315 1.172-.833 1.49l-2.774 1.707a.749.749 0 0 1-1.11-.418l-.954-3.102a1.214 1.214 0 0 1-.145-.125L3.754 9.816a1.218 1.218 0 0 1-.124-.145L.528 8.717a.749.749 0 0 1-.418-1.11l1.71-2.774A1.748 1.748 0 0 1 3.31 4h3.204c.288-.338.59-.665.904-.979l.459-.458A8.749 8.749 0 0 1 14.064 0ZM8.938 3.623h-.002l-.458.458c-.76.76-1.437 1.598-2.02 2.5l-1.5 2.317 2.143 2.143 2.317-1.5c.902-.583 1.74-1.26 2.499-2.02l.459-.458a7.25 7.25 0 0 0 2.123-5.127V1.75a.25.25 0 0 0-.25-.25h-.186a7.249 7.249 0 0 0-5.125 2.123ZM3.56 14.56c-.732.732-2.334 1.045-3.005 1.148a.234.234 0 0 1-.201-.064.234.234 0 0 1-.064-.201c.103-.671.416-2.273 1.15-3.003a1.502 1.502 0 1 1 2.12 2.12Zm6.94-3.935c-.088.06-.177.118-.266.175l-2.35 1.521.548 1.783 1.949-1.2a.25.25 0 0 0 .119-.213ZM3.678 8.116 5.2 5.766c.058-.09.117-.178.176-.266H3.309a.25.25 0 0 0-.213.119l-1.2 1.95ZM12 5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path>
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<template id="shield-check-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-shield-check">
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<template id="heart-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-heart">
    <path d="m8 14.25.345.666a.75.75 0 0 1-.69 0l-.008-.004-.018-.01a7.152 7.152 0 0 1-.31-.17 22.055 22.055 0 0 1-3.434-2.414C2.045 10.731 0 8.35 0 5.5 0 2.836 2.086 1 4.25 1 5.797 1 7.153 1.802 8 3.02 8.847 1.802 10.203 1 11.75 1 13.914 1 16 2.836 16 5.5c0 2.85-2.045 5.231-3.885 6.818a22.066 22.066 0 0 1-3.744 2.584l-.018.01-.006.003h-.002ZM4.25 2.5c-1.336 0-2.75 1.164-2.75 3 0 2.15 1.58 4.144 3.365 5.682A20.58 20.58 0 0 0 8 13.393a20.58 20.58 0 0 0 3.135-2.211C12.92 9.644 14.5 7.65 14.5 5.5c0-1.836-1.414-3-2.75-3-1.373 0-2.609.986-3.029 2.456a.749.749 0 0 1-1.442 0C6.859 3.486 5.623 2.5 4.25 2.5Z"></path>
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</template>

<template id="server-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-server">
    <path d="M1.75 1h12.5c.966 0 1.75.784 1.75 1.75v4c0 .372-.116.717-.314 1 .198.283.314.628.314 1v4a1.75 1.75 0 0 1-1.75 1.75H1.75A1.75 1.75 0 0 1 0 12.75v-4c0-.358.109-.707.314-1a1.739 1.739 0 0 1-.314-1v-4C0 1.784.784 1 1.75 1ZM1.5 2.75v4c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25H1.75a.25.25 0 0 0-.25.25Zm.25 5.75a.25.25 0 0 0-.25.25v4c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25v-4a.25.25 0 0 0-.25-.25ZM7 4.75A.75.75 0 0 1 7.75 4h4.5a.75.75 0 0 1 0 1.5h-4.5A.75.75 0 0 1 7 4.75ZM7.75 10h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM3 4.75A.75.75 0 0 1 3.75 4h.5a.75.75 0 0 1 0 1.5h-.5A.75.75 0 0 1 3 4.75ZM3.75 10h.5a.75.75 0 0 1 0 1.5h-.5a.75.75 0 0 1 0-1.5Z"></path>
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<template id="globe-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-globe">
    <path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM5.78 8.75a9.64 9.64 0 0 0 1.363 4.177c.255.426.542.832.857 1.215.245-.296.551-.705.857-1.215A9.64 9.64 0 0 0 10.22 8.75Zm4.44-1.5a9.64 9.64 0 0 0-1.363-4.177c-.307-.51-.612-.919-.857-1.215a9.927 9.927 0 0 0-.857 1.215A9.64 9.64 0 0 0 5.78 7.25Zm-5.944 1.5H1.543a6.507 6.507 0 0 0 4.666 5.5c-.123-.181-.24-.365-.352-.552-.715-1.192-1.437-2.874-1.581-4.948Zm-2.733-1.5h2.733c.144-2.074.866-3.756 1.58-4.948.12-.197.237-.381.353-.552a6.507 6.507 0 0 0-4.666 5.5Zm10.181 1.5c-.144 2.074-.866 3.756-1.58 4.948-.12.197-.237.381-.353.552a6.507 6.507 0 0 0 4.666-5.5Zm2.733-1.5a6.507 6.507 0 0 0-4.666-5.5c.123.181.24.365.353.552.714 1.192 1.436 2.874 1.58 4.948Z"></path>
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</template>

<template id="issue-opened-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-opened">
    <path d="M8 9.5a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path><path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Z"></path>
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</template>

<template id="device-mobile-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-device-mobile">
    <path d="M3.75 0h8.5C13.216 0 14 .784 14 1.75v12.5A1.75 1.75 0 0 1 12.25 16h-8.5A1.75 1.75 0 0 1 2 14.25V1.75C2 .784 2.784 0 3.75 0ZM3.5 1.75v12.5c0 .138.112.25.25.25h8.5a.25.25 0 0 0 .25-.25V1.75a.25.25 0 0 0-.25-.25h-8.5a.25.25 0 0 0-.25.25ZM8 13a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path>
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<template id="package-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-package">
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<template id="credit-card-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-credit-card">
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<template id="play-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-play">
    <path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Zm4.879-2.773 4.264 2.559a.25.25 0 0 1 0 .428l-4.264 2.559A.25.25 0 0 1 6 10.559V5.442a.25.25 0 0 1 .379-.215Z"></path>
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<template id="gift-icon">
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<template id="code-square-icon">
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<template id="device-desktop-icon">
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        <div class="position-relative">
                <ul
                  role="listbox"
                  class="ActionListWrap QueryBuilder-ListWrap"
                  aria-label="Suggestions"
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                    combobox-commit:query-builder#comboboxCommit
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      <scrollable-region data-labelled-by="custom-scopes-dialog-title">
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          <div data-target="custom-scopes.customScopesModalDialogFlash"></div>

          <input type="hidden" id="custom_scope_id" name="custom_scope_id" data-target="custom-scopes.customScopesIdField">

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              <input
                type="text"
                name="custom_scope_name"
                id="custom_scope_name"
                data-target="custom-scopes.customScopesNameField"
                class="form-control"
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                placeholder="github-ruby"
                required
                maxlength="50">
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              id="custom_scope_query"
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              autocomplete="off"
              placeholder="(repo:mona/a OR repo:mona/b) AND lang:python"
              required
              maxlength="500">
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          <p class="text-small color-fg-muted">
            To see all available qualifiers, see our <a class="Link--inTextBlock" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax">documentation</a>.
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</form>        </div>

        <div data-target="custom-scopes.manageCustomScopesForm">
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</div>
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      <div data-view-component="true" class="Overlay-footer Overlay-footer--alignEnd Overlay-footer--divided">          <button data-action="click:custom-scopes#customScopesCancel" type="button" data-view-component="true" class="btn">    Cancel
</button>
          <button form="custom-scopes-dialog-form" data-action="click:custom-scopes#customScopesSubmit" data-target="custom-scopes.customScopesSubmitButton" type="submit" data-view-component="true" class="btn-primary btn">    Create saved search
</button>
</div>
</dialog></dialog-helper>
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</qbsearch-input>


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  <template class="js-flash-template">
    
<div class="flash flash-full   {{ className }}">
  <div >
    <button autofocus class="flash-close js-flash-close" type="button" aria-label="Dismiss this message">
      <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg>
    </button>
    <div aria-atomic="true" role="alert" class="js-flash-alert">
      
      <div>{{ message }}</div>

    </div>
  </div>
</div>
  </template>
</div>


    






  <div
    class="application-main "
    data-commit-hovercards-enabled
    data-discussion-hovercards-enabled
    data-issue-and-pr-hovercards-enabled
    data-project-hovercards-enabled
  >
        <div itemscope itemtype="http://schema.org/SoftwareSourceCode" class="">
    <main id="js-repo-pjax-container" >
      
  





      
    

    






  
  <div id="repository-container-header"  class="pt-3 hide-full-screen" style="background-color: var(--page-header-bgColor, var(--color-page-header-bg));" data-turbo-replace>

      <div class="d-flex flex-nowrap flex-justify-end mb-3  px-3 px-lg-5" style="gap: 1rem;">

        <div class="flex-auto min-width-0 width-fit">
            
  <div class=" d-flex flex-wrap flex-items-center wb-break-word f3 text-normal">
      <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo color-fg-muted mr-2">
    <path d="M2 2.5A2.5 2.5 0 0 1 4.5 0h8.75a.75.75 0 0 1 .75.75v12.5a.75.75 0 0 1-.75.75h-2.5a.75.75 0 0 1 0-1.5h1.75v-2h-8a1 1 0 0 0-.714 1.7.75.75 0 1 1-1.072 1.05A2.495 2.495 0 0 1 2 11.5Zm10.5-1h-8a1 1 0 0 0-1 1v6.708A2.486 2.486 0 0 1 4.5 9h8ZM5 12.25a.25.25 0 0 1 .25-.25h3.5a.25.25 0 0 1 .25.25v3.25a.25.25 0 0 1-.4.2l-1.45-1.087a.249.249 0 0 0-.3 0L5.4 15.7a.25.25 0 0 1-.4-.2Z"></path>
</svg>
    
    <span class="author flex-self-stretch" itemprop="author">
      <a class="url fn" rel="author" data-hovercard-type="organization" data-hovercard-url="/orgs/cplusplus/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/cplusplus">
        cplusplus
</a>    </span>
    <span class="mx-1 flex-self-stretch color-fg-muted">/</span>
    <strong itemprop="name" class="mr-2 flex-self-stretch">
      <a data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" href="/cplusplus/draft">draft</a>
    </strong>

    <span></span><span class="Label Label--secondary v-align-middle mr-1">Public</span>
  </div>


        </div>

        <div id="repository-details-container" class="flex-shrink-0" data-turbo-replace style="max-width: 70%;">
            <ul class="pagehead-actions flex-shrink-0 d-none d-md-inline" style="padding: 2px 0;">
    
      

  <li>
            <a href="/login?return_to=%2Fcplusplus%2Fdraft" rel="nofollow" id="repository-details-watch-button" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;notification subscription menu watch&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;LOG_IN&quot;,&quot;originating_url&quot;:&quot;https://github.com/cplusplus/draft/pull/2176&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="630f43f4bc90e4e0caded2d4fa18b5d4aea4a9f4800230e7958f4612cf418c6a" aria-label="You must be signed in to change notification settings" data-view-component="true" class="btn-sm btn">    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-bell mr-2">
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</svg>Notifications
</a>    <tool-tip id="tooltip-3ac8b652-80aa-4c00-ac51-a5fcae6ce5ed" for="repository-details-watch-button" popover="manual" data-direction="s" data-type="description" data-view-component="true" class="sr-only position-absolute">You must be signed in to change notification settings</tool-tip>

  </li>

  <li>
          <a icon="repo-forked" id="fork-button" href="/login?return_to=%2Fcplusplus%2Fdraft" rel="nofollow" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;repo details fork button&quot;,&quot;repository_id&quot;:2216249,&quot;auth_type&quot;:&quot;LOG_IN&quot;,&quot;originating_url&quot;:&quot;https://github.com/cplusplus/draft/pull/2176&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="e8e79723392226397f0808061cdbe8efed19289f147103909a3fc7eede6dd888" data-view-component="true" class="btn-sm btn">    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-repo-forked mr-2">
    <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-.878a2.25 2.25 0 1 1 1.5 0v.878a2.25 2.25 0 0 1-2.25 2.25h-1.5v2.128a2.251 2.251 0 1 1-1.5 0V8.5h-1.5A2.25 2.25 0 0 1 3.5 6.25v-.878a2.25 2.25 0 1 1 1.5 0ZM5 3.25a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Zm6.75.75a.75.75 0 1 0 0-1.5.75.75 0 0 0 0 1.5Zm-3 8.75a.75.75 0 1 0-1.5 0 .75.75 0 0 0 1.5 0Z"></path>
</svg>Fork
    <span id="repo-network-counter" data-pjax-replace="true" data-turbo-replace="true" title="793" data-view-component="true" class="Counter">793</span>
</a>
  </li>

  <li>
        <div data-view-component="true" class="BtnGroup d-flex">
        <a href="/login?return_to=%2Fcplusplus%2Fdraft" rel="nofollow" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;star button&quot;,&quot;repository_id&quot;:2216249,&quot;auth_type&quot;:&quot;LOG_IN&quot;,&quot;originating_url&quot;:&quot;https://github.com/cplusplus/draft/pull/2176&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="151c9065f571247c029772a9bd20de70d3dfccd21a6563e735401b37964f45bc" aria-label="You must be signed in to star a repository" data-view-component="true" class="tooltipped tooltipped-sw btn-sm btn">    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star v-align-text-bottom d-inline-block mr-2">
    <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path>
</svg><span data-view-component="true" class="d-inline">
          Star
</span>          <span id="repo-stars-counter-star" aria-label="5938 users starred this repository" data-singular-suffix="user starred this repository" data-plural-suffix="users starred this repository" data-turbo-replace="true" title="5,938" data-view-component="true" class="Counter js-social-count">5.9k</span>
</a></div>
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</ul>

        </div>
      </div>

        <div id="responsive-meta-container" data-turbo-replace>
</div>


          <nav data-pjax="#js-repo-pjax-container" aria-label="Repository" data-view-component="true" class="js-repo-nav js-sidenav-container-pjax js-responsive-underlinenav overflow-hidden UnderlineNav px-3 px-md-4 px-lg-5">

  <ul data-view-component="true" class="UnderlineNav-body list-style-none">
      <li data-view-component="true" class="d-inline-flex">
  <a id="code-tab" href="/cplusplus/draft" data-tab-item="i0code-tab" data-selected-links="repo_source repo_downloads repo_commits repo_releases repo_tags repo_branches repo_packages repo_deployments repo_attestations /cplusplus/draft" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g c" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Code&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
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</svg>
        <span data-content="Code">Code</span>
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</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="issues-tab" href="/cplusplus/draft/issues" data-tab-item="i1issues-tab" data-selected-links="repo_issues repo_labels repo_milestones /cplusplus/draft/issues" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g i" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Issues&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
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</svg>
        <span data-content="Issues">Issues</span>
          <span id="issues-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="685" data-view-component="true" class="Counter">685</span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="pull-requests-tab" href="/cplusplus/draft/pulls" data-tab-item="i2pull-requests-tab" data-selected-links="repo_pulls checks /cplusplus/draft/pulls" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g p" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Pull requests&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" aria-current="page" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item selected">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-pull-request UnderlineNav-octicon d-none d-sm-inline">
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</svg>
        <span data-content="Pull requests">Pull requests</span>
          <span id="pull-requests-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="298" data-view-component="true" class="Counter">298</span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="actions-tab" href="/cplusplus/draft/actions" data-tab-item="i3actions-tab" data-selected-links="repo_actions /cplusplus/draft/actions" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g a" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Actions&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-play UnderlineNav-octicon d-none d-sm-inline">
    <path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Zm4.879-2.773 4.264 2.559a.25.25 0 0 1 0 .428l-4.264 2.559A.25.25 0 0 1 6 10.559V5.442a.25.25 0 0 1 .379-.215Z"></path>
</svg>
        <span data-content="Actions">Actions</span>
          <span id="actions-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="Not available" data-view-component="true" class="Counter"></span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="projects-tab" href="/cplusplus/draft/projects" data-tab-item="i4projects-tab" data-selected-links="repo_projects new_repo_project repo_project /cplusplus/draft/projects" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g b" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Projects&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-table UnderlineNav-octicon d-none d-sm-inline">
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</svg>
        <span data-content="Projects">Projects</span>
          <span id="projects-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="0" hidden="hidden" data-view-component="true" class="Counter">0</span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="wiki-tab" href="/cplusplus/draft/wiki" data-tab-item="i5wiki-tab" data-selected-links="repo_wiki /cplusplus/draft/wiki" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g w" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Wiki&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
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</svg>
        <span data-content="Wiki">Wiki</span>
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</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="security-tab" href="/cplusplus/draft/security" data-tab-item="i6security-tab" data-selected-links="security overview alerts policy token_scanning code_scanning /cplusplus/draft/security" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g s" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Security&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-shield UnderlineNav-octicon d-none d-sm-inline">
    <path d="M7.467.133a1.748 1.748 0 0 1 1.066 0l5.25 1.68A1.75 1.75 0 0 1 15 3.48V7c0 1.566-.32 3.182-1.303 4.682-.983 1.498-2.585 2.813-5.032 3.855a1.697 1.697 0 0 1-1.33 0c-2.447-1.042-4.049-2.357-5.032-3.855C1.32 10.182 1 8.566 1 7V3.48a1.75 1.75 0 0 1 1.217-1.667Zm.61 1.429a.25.25 0 0 0-.153 0l-5.25 1.68a.25.25 0 0 0-.174.238V7c0 1.358.275 2.666 1.057 3.86.784 1.194 2.121 2.34 4.366 3.297a.196.196 0 0 0 .154 0c2.245-.956 3.582-2.104 4.366-3.298C13.225 9.666 13.5 8.36 13.5 7V3.48a.251.251 0 0 0-.174-.237l-5.25-1.68ZM8.75 4.75v3a.75.75 0 0 1-1.5 0v-3a.75.75 0 0 1 1.5 0ZM9 10.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path>
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        <span data-content="Security">Security</span>
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    P0898R3 Standard Library Concepts
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  <span class="gh-header-number color-fg-muted pl-1">#2176</span>
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      <p dir="auto"><span class="issue-keyword">Fixes</span> <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="330868535" data-permission-text="Title is private" data-url="https://github.com/cplusplus/draft/issues/2145" data-hovercard-type="issue" data-hovercard-url="/cplusplus/draft/issues/2145/hovercard" href="https://github.com/cplusplus/draft/issues/2145">#2145</a>.</p>
<p dir="auto">Pushing from a branch in a remote repo rather than <code class="notranslate">motions-2018-06-lwg-28</code> as directed in the <a href="https://github.com/cplusplus/draft/wiki/Applying-papers-to-the-Working-Draft">new application procedure</a> since I don't have commit access and cannot make new branches.</p>
<p dir="auto">Reviewers: Please be brutal. Tiny errors I've made herein will be magnified by one to two orders of magnitude when the One Ranges Proposal is merged - I need the practice.</p>
<p dir="auto">I'd appreciate if someone could assign this to the "post-2018-06" milestone as well.</p>
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    mentioned this pull request
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      [concepts.lib.compare] has many instances of "const lvalue of type Meow"
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          <p dir="auto">Hi <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a> , thanks for the pull request.</p>
<p dir="auto">First of all, we really want to get rid of <code class="notranslate">\textit</code> in the standard text, because it does not convey any semantics. If we ever want to change the formatting of, say, C++98 concepts, <code class="notranslate">\textit</code> is not enough.<br>
So, please add a new macro <code class="notranslate">\oldconcept</code> or something like that to macros.tex, defined to <code class="notranslate">\textit</code>, and use <code class="notranslate">\oldconcept{blah}</code> throughout the text proper. (If you have a better name for the macro, I'm all ears.)<br>
(One of the first use-cases that comes to mind for \oldconcept is to actually start indexing the uses of defined terms, not just the definitions. Not now, though.)</p>
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            <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/CaseyCarter">CaseyCarter</a>
  

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        <a href="#issuecomment-398535044" id="issuecomment-398535044-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:30:52Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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          <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/jensmaurer/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/jensmaurer">@jensmaurer</a> Would it make sense to similarly define a <code class="notranslate">\concept</code> or <code class="notranslate">\libconcept</code> macro for styling (and potential indexing) of new-style concepts?</p>
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          self-requested a review


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        changed the title
<del class="text-bold markdown-title">P898R3 Standard Library Concepts</del>

<ins class="text-bold markdown-title no-underline">P0898R3 Standard Library Concepts</ins>


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              <span class="blob-code-inner blob-code-marker-context">the template argument shall satisfy the</span>

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              <span class="blob-code-inner blob-code-marker-deletion"><span class="x x-first x-last">requirements of an input iterator</span><span class="pl-k">\iref</span>{<span class="pl-c1">input.iterators</span>}.</span>

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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1 x x-first">\textit</span><span class="x">{</span><span class="pl-mi x">Cpp98InputIterator</span><span class="x x-last">} requirements</span><span class="pl-k">\iref</span>{<span class="pl-c1">input.iterators</span>}.</span>

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      <p dir="auto">Could you point to the location in the incoming paper where authorization is given to make this change? The paper says "prepend the prefix 'Cpp98' to uses of the named requirement sets below", but "input iterator" is not a CamelCase fixed-width requirement, it's a prose plain-text requirement, and does not appear in the list in subclause 1.3 of the paper.</p>
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        <a href="#discussion_r196589702" id="discussion_r196589702-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:48:31Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">Subclause 1.3 is woefully incomplete: I missed the Iterator requirements tables and some more obscure sets of named requirements. The design intent - as discussed in LEWG and I believe LWG as well - was to rename <em>all</em> of the old named requirements tables to make way for current and future concepts.</p>
<p dir="auto">It's also important that all references to the requirements use the proper name. The colloquialism "input iterators", for example, can now be interpreted to mean either types that meet the Cpp98InputIterator requirements or types that model the <code class="notranslate">InputIterator</code> concept. We need to very clearly define for users exactly to which set of requirements each such usage is intended to refer.</p>
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      <p dir="auto">I understand the desires, but the paper as moved doesn't say so, and there isn't even a trace of a hint in the paper that this might be the intent, given that only CamelCased requirements are quoted in 1.3. (I'd be happy to be shown otherwise.)</p>
<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a>, are we overstepping our editorial leeway here by changing such phrases, in particular since the result could be incorrectly interpreted as referring to the table only, not the entire set of requirements? (I think we had an editorial issue a few months ago where exactly that point was a concern.)</p>
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        <a href="#discussion_r196625558" id="discussion_r196625558-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T01:27:41Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">I think that was me, and the issue was an edit that changed a cross-reference to the <code class="notranslate">NullablePointer</code> requirements section to point to the table instead.</p>
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        <a href="#discussion_r196566767" id="discussion_r196566767-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:29:05Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">The issue here is that a reference to "forward iterator" (plain text) refers to the entire section [forward.iterators], including (for example) the multi-pass guarantee. In contrast, <em>Cpp98ForwardIterator</em> appears to refer to the table only (which just gives a bit of syntax). That feels like a regression to me.</p>
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      <p dir="auto">"forward iterators" will be ambiguous once Ranges are merged. I understand your point about the distinction between the table and the additional requirements outside the table, though. Do you agree it would be clearer if I retitle the existing sections e.g. "Cpp98ForwardIterator requirements"?</p>
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      <p dir="auto">Yes, I think so. I fear there are Cpp98 concepts definitions that don't have a section of their own, though, so this strategy might fail here and there. Before you subscribe for more work, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a> should really chime in how he wants to proceed here.<br>
In any case, make sure all those changes are a (one) separate commit so that they can be messed with easily.</p>
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              <span class="blob-code-inner blob-code-marker-context">sorted with respect to <span class="pl-c1">\tcode</span>{operator&lt;} or <span class="pl-c1">\tcode</span>{comp}.</span>

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              <span class="blob-code-inner blob-code-marker-context"><span class="pl-c1">\tcode</span>{BidirectionalIterator} shall satisfy the</span>

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      <p dir="auto">I'm working on that. My current plan is to uniformly use "<code class="notranslate">T</code> meets the CppXXX requirements" for "old" concepts (which is the prevalent library usage, this occurrence is aberrant), "<code class="notranslate">T</code> satisfies <code class="notranslate">Concept</code>" to mean purely syntactic conformance (which is the proper core language meaning of :"satisfy"), and "<code class="notranslate">T</code> models <code class="notranslate">Concept</code>" to mean that <code class="notranslate">T</code> must both satisfy <code class="notranslate">Concept</code> and must further meet the semantic requirements or the program is ill-formed NDR.</p>
<p dir="auto">I'm working on rewording the combined Ranges paper to use that style, and plan to submit future editorial changes to the rest of the library specification to make everything uniform.</p>
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      <p dir="auto">See also some earlier discussion in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="196084856" data-permission-text="Title is private" data-url="https://github.com/cplusplus/draft/issues/1263" data-hovercard-type="issue" data-hovercard-url="/cplusplus/draft/issues/1263/hovercard" href="https://github.com/cplusplus/draft/issues/1263">#1263</a>. I understand some decisions are obsolete now.</p>
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              <span class="blob-code-inner blob-code-marker-deletion">the template argument shall satisfy the<span class="x x-first x-last"> requirements</span></span>

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              <span class="blob-code-inner blob-code-marker-deletion"><span class="x x-first x-last">of an output iterator</span><span class="pl-k">\iref</span>{<span class="pl-c1">output.iterators</span>}.</span>

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        <a href="#discussion_r196568288" id="discussion_r196568288-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:33:47Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">I'm wondering whether we can find a slightly less awkward spelling than "Cpp98Blah" for these old-style concepts. Maybe even something innovative such as OutputIterator<sub>98</sub> would work.</p>
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        <a href="#discussion_r196592242" id="discussion_r196592242-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:58:33Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">I'm certainly not married to "Cpp98Blah". It's better than LEWG's suggestion "STL1Blah", but that wasn't a high bar to meet. Now that the styling is macro-ized, we can change it with a one-liner.</p>
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        <a href="#discussion_r196625832" id="discussion_r196625832-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T01:29:53Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto"><em>Cpp98MoveConstructible</em> certainly feels anachronistic.</p>
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        <a href="#discussion_r196834213" id="discussion_r196834213-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T15:46:12Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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<p dir="auto">Cpp98MoveConstructible certainly feels anachronistic.</p>
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<p dir="auto">We specifically pointed out that example in both LEWG discussion of the Ranges proposal and LWG discussion of this proposal, and both subgroups found the confusion level acceptable.</p>
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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\definition</span>{expression-equivalent}{defns.expression-equivalent}</span>

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              <span class="blob-code-inner blob-code-marker-addition">relationship that exists between two expressions <span class="pl-c1">\tcode</span>{E1} and <span class="pl-c1">\tcode</span>{E2} such that</span>

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      <p dir="auto">ISO wants us to phrase definitions of such terms in a way so that you can macro-expand the definition into the point-of-use and the sentence stays intact (modulo semantic parentheses implied by the macro). I think this wouldn't work here.</p>
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              <span class="blob-code-inner blob-code-marker-addition">A declaration may explicitly impose requirements through its associated</span>

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              <span class="blob-code-inner blob-code-marker-addition">constraints<span class="pl-k">\iref</span>{<span class="pl-c1">temp.constr.decl</span>}. When the associated constraints refer to a</span>

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              <span class="blob-code-inner blob-code-marker-addition">concept<span class="pl-k">\iref</span>{<span class="pl-c1">temp.concept</span>}, additional semantic requirements are imposed on the</span>

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              <span class="blob-code-inner blob-code-marker-addition">use of the declaration.</span>

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      <p dir="auto">How about "When the associated constraints refer to a concept\iref{temp.concept}, the semantic constraints specified for that concept are additionally imposed on the use of the declaration."?</p>
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        <a href="#discussion_r196597312" id="discussion_r196597312-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:20:48Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">Yes, seems to be an improvement. (Make sure to keep those rephrasings separate from the original commit with the as-moved paper.)</p>
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              <span class="blob-code-inner blob-code-marker-deletion">the template argument shall satisfy the<span class="x x-first x-last"> requirements</span></span>

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              <span class="blob-code-inner blob-code-marker-deletion"><span class="x x-first x-last">of a forward iterator</span><span class="pl-k">\iref</span>{<span class="pl-c1">forward.iterators</span>}.</span>

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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1 x x-first">\oldconcept</span><span class="x x-last">{ForwardIterator} requirements</span><span class="pl-k">\iref</span>{<span class="pl-c1">forward.iterators</span>}.</span>

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        <a href="#discussion_r196573757" id="discussion_r196573757-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:50:33Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r196594448" id="discussion_r196594448-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:07:48Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">Repeating my reply to your original comment (that Github will likely bury after the <code class="notranslate">\oldconcept</code> push):</p>
<p dir="auto">"forward iterators" will be ambiguous once Ranges are merged. I understand your point about the distinction between the table and the additional requirements outside the table, though. Do you agree it would be clearer if I retitle the existing sections e.g. "Cpp98ForwardIterator requirements"?</p>
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        <a href="#discussion_r197012676" id="discussion_r197012676-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:12:26Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">I'm ok with that, although that doesn't really remove the ambiguity if the table continues to be labeled the same as the section. <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a>?</p>
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        <a href="#discussion_r197014705" id="discussion_r197014705-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:28:10Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">Yes, I'd thought about the ambiguity of both subclauses and tables titled "Foo requirements," although that's pre-existing, for example, [allocator.requirements] is titled "Allocator requirements" and contains Table 31 "Allocator requirements". We should retitle those tables to something generic like "Allocator valid expressions with semantics" - [structure.requirements]/4 says they are "a<br>
table that specifies an initial set of the valid expressions and their semantics." Which is also a misnomer.</p>
<p dir="auto">I'm waiting for Richard's nod to enact these changes. I have more work to do on the merged Ranges proposal than time before the mailing deadline to do it in, so I don't want to walk down any blind alleys.</p>
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              <span class="blob-code-inner blob-code-marker-context">the template argument shall satisfy the</span>

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              <span class="blob-code-inner blob-code-marker-deletion"><span class="x x-first x-last">requirements of an input iterator</span><span class="pl-k">\iref</span>{<span class="pl-c1">input.iterators</span>}.</span>

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      <p dir="auto">Where in the incoming paper is authorization given for this change? InputIterator is not in the list of CamelCase concepts in section 1.3 of the paper.</p>
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      <p dir="auto">Repeating my reply to your original comment (that Github will likely bury after the <code class="notranslate">\oldconcept</code> push):</p>
<p dir="auto">Subclause 1.3 is woefully incomplete: I missed the Iterator requirements tables and some more obscure sets of named requirements. The design intent - as discussed in LEWG and I believe LWG as well - was to rename all of the old named requirements tables to make way for current and future concepts.</p>
<p dir="auto">It's also important that all references to the requirements use the proper name. The colloquialism "input iterators", for example, can now be interpreted to mean either types that meet the Cpp98InputIterator requirements or types that model the InputIterator concept. We need to very clearly define for users exactly to which set of requirements each such usage is intended to refer.</p>
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        <a href="#discussion_r197012817" id="discussion_r197012817-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:13:25Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">overloads matching the signatures of overloads defined in namespace <span class="pl-c1">\tcode</span>{std}.</span>

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              <span class="blob-code-inner blob-code-marker-addition">be used by a customization point object.</span>

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        <a href="#discussion_r196575327" id="discussion_r196575327-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:55:31Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r196593712" id="discussion_r196593712-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:04:37Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">[temp.constr.order]/3 defines "more constrained" as an orthogonal notion to "more specialized." The two notions interact in overload resolution where "more constrained" is used to discriminate between overloads neither of which is more specialized, but "more constrained" is not otherwise a special case.</p>
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        <a href="#discussion_r196597974" id="discussion_r196597974-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:24:09Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r196576102" id="discussion_r196576102-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T20:58:10Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">(Not editorial) I find it odd that an incomplete type would cause undefined behavior; it's a compile-time failure and should be ill-formed (possibly no diagnostic required).</p>
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      <p dir="auto">LWG has been addressing a similar problem with the type traits to require implementations to diagnose precondition violations. There's currently no technology to do so with concepts, but this at least leaves the avenue open for future changes.</p>
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      <p dir="auto">I'm complaining about the fact that this situation is in the "undefined behavior" category, not in a (separate) category "ill-formed, no diagnostic required". The latter would leave avenues open, too, but would also permit implementations to diagnose and refuse e.g. incomplete types today. And, maybe there is even a conflict here if some preconditions says "shall be a complete type" (i.e. compile-time diagnostic), yet this section says "undefined behavior" (i.e. only bad if you actually evaluate it, which seems a misguided idea for a compile-time violation).</p>
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        <a href="#discussion_r196835157" id="discussion_r196835157-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T15:48:58Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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        <a href="#discussion_r197012964" id="discussion_r197012964-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:14:22Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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        <a href="#discussion_r201801134" id="discussion_r201801134-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-07-11T18:45:06Z" class="no-wrap">Jul 11, 2018</relative-time></a>


      
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      commented


        <a href="#issuecomment-398545114" id="issuecomment-398545114-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:03:47Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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          <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a> "Would it make sense to similarly define a \concept or \libconcept macro for styling (and potential indexing) of new-style concepts?"<br>
Yes, please.</p>
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            requested changes


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              <span class="blob-code-inner blob-code-marker-addition"> \hspace*{2ex}\tcode{basic_common_reference;}</span>

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              <span class="blob-code-inner blob-code-marker-addition"> template parameter in the specialization depends on a user-defined</span>

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              <span class="blob-code-inner blob-code-marker-addition"> template parameter in the specialization depends on a user-defined</span>

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              <span class="blob-code-inner blob-code-marker-addition"> type. If there is a member \tcode{type}, it shall be a \grammarterm{typedef-name}.</span>

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        <a href="#discussion_r196582157" id="discussion_r196582157-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:19:26Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r196626389" id="discussion_r196626389-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T01:34:12Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">Technically, it's observable in some cases with an <em>elaborated-type-specifier</em>.</p>
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        <a href="#discussion_r196836130" id="discussion_r196836130-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T15:51:46Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">I'd be happy to change this to "If there is a member <code class="notranslate">\tcode{type}</code>, it shall denote a type." if we're willing to call that change editorial-ish.</p>
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        <a href="#discussion_r197013187" id="discussion_r197013187-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:15:46Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/timsong-cpp/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/timsong-cpp">@timsong-cpp</a> is right, such a change would be observable so can't be done editorially. <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a>, could you please check whether there is already an LWG issue for that, and file one if not?</p>
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      <strong>
            <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/CaseyCarter">CaseyCarter</a>
  

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        <a href="#discussion_r197015240" id="discussion_r197015240-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:32:18Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">\item \tcode{CREF(A)} be \tcode{add_lvalue_reference_t&lt;const remove_reference_t&lt;A&gt;{}&gt;},</span>

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        <a href="#discussion_r196582833" id="discussion_r196582833-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:22:00Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">Why are we creating two invented function types here, just to call them and look at their result values? What's the net difference vs. omitting the indirection via the function references? What's the net difference vs. <code class="notranslate">common_type_t&lt;X,Y&gt;</code>?</p>
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      <p dir="auto">This is a truly disgusting hack to avoid <code class="notranslate">declval</code>'s <code class="notranslate">add_rvalue_reference_t</code> on the return type. <code class="notranslate">decltype(declval&lt;X&gt;())</code> is <code class="notranslate">add_rvalue_reference_t&lt;X&gt;</code>, <code class="notranslate">decltype(declval&lt;X(&amp;)()&gt;()()</code> is exactly <code class="notranslate">X</code>. We discussed at length in LWG that this is abominable, and that no one had an idea for an improvement.</p>
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            <a class="author Link--primary text-bold css-overflow-wrap-anywhere " show_full_name="false" data-hovercard-type="user" data-hovercard-url="/users/jensmaurer/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/jensmaurer">jensmaurer</a>
  

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        <a href="#discussion_r196599146" id="discussion_r196599146-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:30:08Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      </strong>

      

      


        <a href="#discussion_r196618133" id="discussion_r196618133-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T00:25:29Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">Because <code class="notranslate">X</code> and <code class="notranslate">Y</code> may be cv-qualified or reference types, and <code class="notranslate">common_type</code> decays its arguments: that's the entire motivation for adding <code class="notranslate">common_reference</code>.</p>
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        <a href="#discussion_r196627001" id="discussion_r196627001-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T01:39:44Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">For cppreference, I just invented a <code class="notranslate">declval</code> substitute that returns <code class="notranslate">T</code> instead and used that, FWIW.</p>
<p dir="auto">(<code class="notranslate">decltype(declval&lt;X(&amp;)()&gt;()())</code> is also not exactly <code class="notranslate">X</code>; it's subject to the usual prvalue cv-qualification adjustment rules and the rvalue-reference-to-function-is-lvalue rule.)</p>
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      <p dir="auto">I'd hate to define yet another exposition-only helper here that's only going to be used in this one place; <code class="notranslate">COMMON_REF</code> is overrun with them. Do we agree that <code class="notranslate">template &lt;class T&gt; T __val() noexcept; // \expos</code> ... <code class="notranslate">decltype(false ? __val&lt;X&gt;() : __val&lt;Y&gt;())</code> is an improvement?</p>
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        <a href="#discussion_r196891868" id="discussion_r196891868-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T18:12:44Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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<p dir="auto">I'd hate to define yet another exposition-only helper here</p>
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<p dir="auto">I thought this discussion was familiar: <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="210597696" data-permission-text="Title is private" data-url="https://github.com/ericniebler/stl2/issues/338" data-hovercard-type="issue" data-hovercard-url="/ericniebler/stl2/issues/338/hovercard?comment_id=309616140&amp;comment_type=issue_comment" href="https://github.com/ericniebler/stl2/issues/338#issuecomment-309616140">ericniebler/stl2#338 (comment)</a>.</p>
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        <a href="#discussion_r197013969" id="discussion_r197013969-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:21:25Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">Maybe we shouldn't change anything here and go with the formulation in the paper. These nuances are important, but the code snippets for the meta-functions are way too obtuse to communicate that effectively. Can we maybe add a few notes or examples explaining what the intent is (in particular involving subtleties of prvalues vs. xvalues)? (As a matter of principle, I'm wondering whether some prose relying on the core language mechanics of the ?: operator or "common type" would be shorter and easier to understand. Not now.)</p>
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              <span class="blob-code-inner blob-code-marker-deletion">  <span class="x x-first x-last">   This will not apply </span>if <span class="x x-first x-last">there is a specialization </span>\tcode{<span class="x x-first x-last">common_type&lt;D1, D2&gt;}.</span></span>

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              <span class="blob-code-inner blob-code-marker-addition">    <span class="x x-first x-last">denotes a valid type, let \tcode{C} denote that type.</span></span>

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        <a href="#discussion_r196588882" id="discussion_r196588882-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:45:15Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">Both \iref's should be \ref's (with a space in front); the \iref automatically adds parens that we don't want here (compare to the parallel phrasing for common_type two paragraphs above).</p>
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        <a href="#discussion_r196599070" id="discussion_r196599070-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:29:39Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">Moreover, \tcode{basic_common_reference&lt;T, U, TQual, UQual&gt;::type} shall denote</span>

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              <span class="blob-code-inner blob-code-marker-addition">the same type, if any, as does \tcode{basic_common_reference&lt;U, T, UQual, TQual&gt;::type}.</span>

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              <span class="blob-code-inner blob-code-marker-addition">A program shall not specialize \tcode{basic_common_reference} on the third or</span>

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              <span class="blob-code-inner blob-code-marker-addition">fourth parameters, \tcode{TQual} or \tcode{UQual}. No diagnostic is required for</span>

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      <p dir="auto">What does that mean? Are you talking about partial specialization here? Then you should say so at the start of this paragraph. (A specialization is a non-template; a partial specialization is a template: two fundamentally different things.)</p>
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      <p dir="auto">Yes, the intent here is that users partially specialize <code class="notranslate">basic_common_reference</code>. I admit that I can't see a reason now for "A program shall not specialize <code class="notranslate">\tcode{basic_common_reference}</code> on the third or fourth parameters, <code class="notranslate">\tcode{TQual}</code> or <code class="notranslate">\tcode{UQual}</code>." I believe the intent is to make it harder for users to do something stupid and violate the other requirements and/or point them more directly down the intended path.</p>
<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/ericniebler/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/ericniebler">@ericniebler</a>, can you clarify the intent of this particular requirement?</p>
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      <p dir="auto">Yes, the intent here is to disallow specifying the third or fourth template parameters in either a partial or explicit specialization. Those parameters are specified by the <code class="notranslate">common_reference</code> trait. The exact unary templates used as template arguments to the (possibly user-specialized) <code class="notranslate">basic_common_reference</code> instantiation are unspecified, and implementors are free to change them between releases. Any code that specializes on those parameters (either partial or explicit) is <em>de facto</em> wrong.</p>
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        <a href="#discussion_r196847664" id="discussion_r196847664-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T16:21:44Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">Does a program with such a specialization <em>need</em> to be IFNDR? IMO it's sufficient that <code class="notranslate">common_reference</code> specifies how and when it works, and users shouldn't be surprised when their broken specializations are never selected.</p>
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      <p dir="auto">I suppose not. Striketh the sentence if it offendeth thee.</p>
<p dir="auto">An alternative which I hadn't considered until just now is to redesign the trait to make it impossible to misuse:</p>
<div class="highlight highlight-source-c++ notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="template &lt;class A, class B&gt;
struct basic_common_reference {
  template &lt;template &lt;class&gt; class AQual, template &lt;class&gt; class BQual&gt;
  using type = ...;
};"><pre class="notranslate"><span class="pl-k">template </span>&lt;<span class="pl-k">class</span> <span class="pl-en">A</span>, <span class="pl-k">class</span> <span class="pl-en">B</span>&gt;
<span class="pl-k">struct</span> <span class="pl-en">basic_common_reference</span> {
  <span class="pl-k">template </span>&lt;<span class="pl-k">template </span>&lt;<span class="pl-k">class</span>&gt; <span class="pl-k">class</span> <span class="pl-en">AQual</span>, <span class="pl-k">template </span>&lt;<span class="pl-k">class</span>&gt; <span class="pl-k">class</span> <span class="pl-en">BQual</span>&gt;
  <span class="pl-k">using</span> type = ...;
};</pre></div>
<p dir="auto">EDIT: That is obviously not editorial. :-)</p>
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      <p dir="auto">I don't know that I buy "impossible to misuse", but I'll make a note to possibly file an issue to make this design change after we investigate it more thoroughly.</p>
<p dir="auto">...and strike the requirement for now, since we think it adds no useful normative effect.</p>
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        <a href="#discussion_r197014244" id="discussion_r197014244-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:24:04Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">My original concern here was the use of the word "specialization" for a case where only partial specializations should ever appear in user programs (because the arguments for AQual and BQual are controlled from the outside, so specializing on them doesn't make sense). I'd appreciate an LWG issue for at least that part.</p>
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        <a href="#discussion_r197015957" id="discussion_r197015957-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:38:17Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">I did change the first sentence of what is now "Note D" to read:</p>
<blockquote>
<p dir="auto">Notwithstanding the provisions of \ref{meta.type.synop}, and pursuant to \ref{namespace.std}, a program may <strong>partially</strong> specialize \tcode{basic_common_reference&lt;T, U, TQual, UQual&gt;} for types \tcode{T} and \tcode{U} such that \tcode{is_same_v&lt;T, decay_t{&gt;}} and \tcode{is_same_v&lt;U, decay_t{&gt;}} are each \tcode{true}.</p>
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<p dir="auto">which I consider to be an editorial clarification. If you feel that change is insufficient or not editorial, I'll revert it and file an issue.</p>
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        <a href="#discussion_r196840716" id="discussion_r196840716-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T16:04:21Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">The <span class="pl-c1">\tcode</span>{UniformRandomBitGenerator} concept is a slight relaxation of the uniform random bit generator requirements, in that it does not require a nested <span class="pl-c1">\grammarterm</span>{typedef-name} <span class="pl-c1">\tcode</span>{result_type}.</span>

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        <a href="#discussion_r196591027" id="discussion_r196591027-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T21:53:52Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">The <span class="pl-c1">\tcode</span>{UniformRandomBitGenerator} concept is a slight relaxation of the uniform random bit generator requirements, in that it does not require a nested <span class="pl-c1">\grammarterm</span>{typedef-name} <span class="pl-c1">\tcode</span>{result_type}.</span>

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      <p dir="auto">The presentation seems suboptimal and redundant here. It seems more compact to introduce \concept{UniformRandomBitGenerator} first (which is the more relaxed concept) and then define "uniform random bit generator" in terms of that, adding the result_type requirement.</p>
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      <p dir="auto">You mean something like <a href="https://github.com/cplusplus/draft/files/2117498/urbg.pdf">urbg.pdf</a>? That seems to go a bit past "editorial", but I'm game if you folks are.</p>
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      <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a>: Yes, that looks like an improvement. Do consider <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/timsong-cpp/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/timsong-cpp">@timsong-cpp</a>'s comment, though, "char" (if it happens to be unsigned on a particular platform) seems to be an UnsignedIntegral type (but is not an unsigned integral type per the core language). Similar for "bool". Keep this rewording in a separate commit so that it can be reviewed extra-carefully. (In my view, doing this rewording editorially is fine as long as the normative outcome is exactly the same as before. The larger the rewording, the more danger to introduce inadvertent differences, though, so <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a> may want to eventually drop the patch when merging.)</p>
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        <a href="#discussion_r196852726" id="discussion_r196852726-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T16:36:52Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">I'll reword to:</p>
<div class="highlight highlight-text-tex-latex notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="A class \tcode{G} meets the \term{uniform random bit generator} requirements if
\tcode{G} models \libconcept{UniformRandomBitGenerator},
\tcode{invoke_result_t&lt;G\&amp;&gt;} is an unsigned integer type\iref{basic.fundamental},
and
\tcode{G} provides a nested \grammarterm{typedef-name} \tcode{result_type}
that denotes the same type as \tcode{invoke_result_t&lt;G\&amp;&gt;}."><pre class="notranslate">A class <span class="pl-c1">\tcode</span>{G} meets the <span class="pl-c1">\term</span>{uniform random bit generator} requirements if
<span class="pl-c1">\tcode</span>{G} models <span class="pl-c1">\libconcept</span>{UniformRandomBitGenerator},
<span class="pl-c1">\tcode</span>{invoke_result_t&lt;G<span class="pl-cce">\&amp;</span>&gt;} is an unsigned integer type<span class="pl-k">\iref</span>{<span class="pl-c1">basic.fundamental</span>},
and
<span class="pl-c1">\tcode</span>{G} provides a nested <span class="pl-c1">\grammarterm</span>{typedef-name} <span class="pl-c1">\tcode</span>{result_type}
that denotes the same type as <span class="pl-c1">\tcode</span>{invoke_result_t&lt;G<span class="pl-cce">\&amp;</span>&gt;}.</pre></div>
<p dir="auto">to fix the normative difference between "unsigned integer type" and <code class="notranslate">UnsignedIntegral</code> and add this in a separate commit.</p>
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          <p dir="auto">I've reviewed all changes except the entirely-new top-level clause "concepts".</p>
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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\rSec</span>2[concepts.lib.general.equality]{Equality Preservation}</span>

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              <span class="blob-code-inner blob-code-marker-addition">An expression is <span class="pl-c1">\term</span>{equality preserving} if, given equal inputs, the expression results in</span>

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      <p dir="auto">This needs to become a defined term with an index entry. Use \defnx{equality preserving}{expression!equality preserving} .</p>
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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\end</span>{<span class="pl-smi">note</span>}</span>

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              <span class="blob-code-inner blob-code-marker-addition">Expressions declared in a <span class="pl-c1">\grammarterm</span>{requires-expression} in this document are</span>

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      <p dir="auto">I have a hard time associating "declared" with expressions. We declare names and functions and variables and whatnot, but not expressions. Also, a requires-expression may also appear in non-declaration contexts (e.g. as an expression-statement).<br>
Also, in which situation could a requires-expression not be equality preserving? It seems to be a totally compile-time concepts-checking expression that never modifies any object at all.</p>
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      <p dir="auto">So, this is intended to refer to the <em>expression</em> inside a simple-requirement and inside a compound-requirement.<br>
Maybe the phrasing is missing a crucial "were they evaluated" or similar, because requires-expressions are unevaluated operands and thus never actually evaluated (and thus, talking about equality preserving doesn't really make sense). (This ventures beyond editorial.)</p>
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      <p dir="auto">Follow-on question: We're only talking about "expression" here, but what about the implicit conversion to the specified type in a compound-requirement? That is syntactically not part of the <em>expression</em>, yet could affect "equality preserving".</p>
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        <a href="#discussion_r196629190" id="discussion_r196629190-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T01:59:33Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">We always want explicit convertibility as well when we require implicit convertibility, which means that we'd use <code class="notranslate">ConvertibleTo</code> instead. (But perhaps <code class="notranslate">ConvertibleTo</code> is missing a requirement that the conversion is equality-preserving?)</p>
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      <p dir="auto">Hm... ConvertibleTo has a <em>simple-requirement</em>, which contains a <code class="notranslate">static_cast&lt;&gt;</code> expression, which we're instructed needs to be equality preserving. Ah, but... see below.</p>
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      <p dir="auto">I wonder if in the library preamble we can handwave that when the library uses an implicit conversion constrain we also require explicit conversion (with the same semantics) and equality preservation. And then stump for more help from the core language regarding conversion constraints.</p>
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      <p dir="auto">I'd prefer to be explicit about conversions. I don't think writing <code class="notranslate">{ E } -&gt; ConvertibleTo&lt;T&gt;;</code> is a significant burden over <code class="notranslate">{ E } -&gt; T;</code> - not enough so to have the same syntax implicitly result in different <em>checked</em> constraints, anyway. I'll file an issue to deal with the interaction of equality-preservation and implicit conversion constraints. It doesn't really matter to Ranges, but I suspect someone will eventually want to specify a library component with such a constraint and it needs to have a well-defined meaning rather than us simply telling them to not do that bad thing.</p>
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      <p dir="auto">Clarification: today we have to write <code class="notranslate">E; requires ConvertibleTo&lt;decltype((E)), T&gt;;</code> to express that constraint properly in terms of the exact type and value category of <code class="notranslate">E</code>. Once P1084 is adopted, it can be simplified to <code class="notranslate">{ E } -&gt; ConvertibleTo&lt;T&gt;;</code>.</p>
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      <p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a>: I don't buy the "expression pattern" theory for the case of new-style concepts. (I agree regarding old-style concepts.) With concepts in the core language, we no longer have to handwave which expressions we mean:  Concepts show actual code that can be compiled. There are no "patterns" going on beyond what the core language prescribes. To wit: the text is referring to the grammar non-terminal <em>requires-expression</em>.<br>
My narrow (editorial) issue here is that "expressions declared in..." sounds broken to me; expressions are never "declared". Further (new concern), it's unclear whether "in" is also intended to cover any subexpression of the top-level expressions in the requirements.<br>
I'd appreciate a clear syntax decomposition of requires-expression to define which expressions are in view here (maybe call them "required expressions" or so). Maybe that's not editorial to start with. <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a>?</p>
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      <p dir="auto">Would replacing "Expressions declared in a <em>requires-expression</em> in this document..." with "Expressions that appear in a <em>simple-requirement</em> or <em>compound-requirement</em> of a <em>requires-expression</em> in the standard library..." be an improvement? That seems to address much of your concerns.</p>
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              <span class="blob-code-inner blob-code-marker-addition">An expression that may alter the value of one or more of its inputs in a manner</span>

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              <span class="blob-code-inner blob-code-marker-addition">observable to equality preserving expressions is said to modify those inputs.</span>

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      <p dir="auto">"equality preserving" is used as an adjective here and needs a hyphen. <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a> should decide whether we want to always hyphenate, even if "preserving" could be interpreted as a verb, with the view that "equality-preserving" is a new, specially made-up adjective that we want to use as a fixed term (and we never mentally disassemble it into "equality" and "preserving").</p>
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      <p dir="auto">I believe all uses of "equality preserving" (with the obvious exception of the definition) are adjective phrases and should be hyphenated.</p>
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      <p dir="auto">Then we should also hyphenate the definition (and maybe consider rephrasing it to "An equality-preserving expression is an expression that ...")</p>
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              <span class="blob-code-inner blob-code-marker-addition">as ill-formed a program which requires <span class="pl-c1">\tcode</span>{C&lt;T&gt;}.</span>

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        <a href="#discussion_r196604363" id="discussion_r196604363-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T22:58:20Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">whose return type is <span class="pl-c1">\tcode</span>{U}. <span class="pl-c1">\tcode</span>{CommonReference&lt;T, U&gt;} is satisfied</span>

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              <span class="blob-code-inner blob-code-marker-addition">only if:</span>

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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-k">\item</span> <span class="pl-c1">\tcode</span>{C(t())} equals <span class="pl-c1">\tcode</span>{C(t())} if and only if <span class="pl-c1">\tcode</span>{t()} is an</span>

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        <a href="#discussion_r196606738" id="discussion_r196606738-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T23:11:41Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">The "if and only if" feels wrong here; it seems to say that C(t()) must have a value different from C(t()) if t() is not equality preserving. That seems hard to do, since t() could modify some unknown global variable.</p>
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      <p dir="auto">Multiple evaluations of a non-equality-preserving <code class="notranslate">t()</code> could also sometimes have the same value, in which case <code class="notranslate">C(t())</code> might be equal.</p>
<p dir="auto">I think fixing this will require normative changes and not simply editorial clarification - I'll have to file an issue. <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/ericniebler/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/ericniebler">@ericniebler</a>, thoughts?</p>
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              <td data-line-number="470" class="blob-num blob-num-addition"></td>

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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\end</span>{<span class="pl-smi">itemdescr</span>}</span>

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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\rSec</span>2[concepts.lib.corelang.integral]{Concept <span class="pl-c1">\tcode</span>{Integral}}</span>

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        <a href="#discussion_r196607178" id="discussion_r196607178-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T23:14:30Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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      <p dir="auto">I'd be mildly concerned about confusion as to which concepts correspond with which prose requirements - despite that prose requirements are always introduced with "Let <code class="notranslate">T</code> be ... <code class="notranslate">Concept&lt;T&gt;</code> is satisfied only if"- but I don't think that's insurmountable.</p>
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              <span class="blob-code-inner blob-code-marker-addition"><span class="pl-c1">\rSec</span>2[concepts.lib.corelang.signedintegral]{Concept <span class="pl-c1">\tcode</span>{SignedIntegral}}</span>

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        <a href="#discussion_r196607278" id="discussion_r196607278-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T23:15:05Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r196609421" id="discussion_r196609421-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-19T23:27:56Z" class="no-wrap">Jun 19, 2018</relative-time></a>


      
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        <a href="#discussion_r197018465" id="discussion_r197018465-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:56:08Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">Also <code class="notranslate">#include &lt;cassert&gt;</code>, or change the assertions in <code class="notranslate">main</code> to the shiny <code class="notranslate">[[assert: ... ]];</code></p>
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        <a href="#discussion_r197016144" id="discussion_r197016144-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:39:48Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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        <a href="#discussion_r197018496" id="discussion_r197018496-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:56:23Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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      <p dir="auto">We also don't usually include headers in library examples. Since this particular example is hypothetical user code, not library code, with a <code class="notranslate">main()</code> and all, I think it makes more sense to write it like a user would.</p>
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        <a href="#issuecomment-398621813" id="issuecomment-398621813-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T04:37:58Z" class="no-wrap">Jun 20, 2018</relative-time></a>

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          <div class="email-quoted-reply"> On Jun 19, 2018, at 9:12 PM, timsong-cpp ***@***.***&gt; wrote:

 <a class="user-mention" href="https://github.com/timsong-cpp">@timsong-cpp</a> commented on this pull request.

 In source/numerics.tex:

 &gt; @@ -1786,6 +1786,30 @@
  \indextext{requirements!uniform random bit generator|)}%
  \indextext{uniform random bit generator!requirements|)}

 +\pnum
 +The \tcode{UniformRandomBitGenerator} concept is a slight relaxation of the uniform random bit generator requirements, in that it does not require a nested \grammarterm{typedef-name} \tcode{result_type}.
 +

 It also relaxes the rules by only requiring the result type to model UnsignedIntegral instead of be an unsigned integer type. The former permits bool and character types that are unsigned.</div>
<div class="email-fragment">I believe not.  Please see [rand.req.genl]/1f.</div>
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          <p dir="auto">We don't use <code class="notranslate">UIntType</code> anywhere in [rand.req.urng]. The "uniform random bit generator" requirements merely requires <code class="notranslate">result_type</code> to be "an unsigned integer type". The <code class="notranslate">UniformRandomBitGenerator</code> concept relaxes that and only requires the result type model <code class="notranslate">UnsignedIntegral</code>.</p>
<p dir="auto">The engine templates in the standard do use <code class="notranslate">UIntType</code>, so instantiating them with, say, <code class="notranslate">char32_t</code> or <code class="notranslate">unsigned char</code>, is undefined. But it appears to be possible to write a type yourself with a <code class="notranslate">result_type</code> of <code class="notranslate">unsigned char</code> and have it meet the uniform random bit generator requirements.</p>
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              <span class="blob-code-inner blob-code-marker-addition">There need be no subsumption relationship between <span class="pl-c1">\tcode</span>{Assignable&lt;LHS, RHS&gt;}</span>

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              <span class="blob-code-inner blob-code-marker-addition">and <span class="pl-c1">\tcode</span>{is_<span class="pl-cce">\-</span>lval<span class="pl-cce">\-</span>ue_<span class="pl-cce">\-</span>ref<span class="pl-cce">\-</span>er<span class="pl-cce">\-</span>ence_v&lt;LHS&gt;}.</span>

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              <span class="blob-code-inner blob-code-marker-addition">Expressions required by this specification to be equality preserving are further</span>

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              <span class="blob-code-inner blob-code-marker-addition">required to be stable: two evaluations of such an expression with the same input</span>

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              <span class="blob-code-inner blob-code-marker-addition">objects must have equal outputs absent any explicit intervening modification of</span>

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      <p dir="auto">Don't use "must"; it's only used for consequences of laws of nature and similar such things in the ISO world.<br>
In this case "are required to" seems appropriate. Please do me a favor and "grep" for "must" in the rest of the text and eradicate it.</p>
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        <a href="#discussion_r196898914" id="discussion_r196898914-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-20T18:34:50Z" class="no-wrap">Jun 20, 2018</relative-time></a>


      
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      <p dir="auto">I sincerely hope that "the rest of the text" means the text added in this PR, and not the full text of the Standard. There are a great many "must"s that we must eradicate to please ISO.</p>
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        <a href="#discussion_r197016303" id="discussion_r197016303-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T05:41:04Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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              <span class="blob-code-inner blob-code-marker-addition">  requires(From (&amp;f)()) { static_cast&lt;To&gt;(f()); };</span>

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      <p dir="auto">So, we need to ascertain that the expression <code class="notranslate">static_cast&lt;To&gt;(f())</code> is equality preserving, right?<br>
Could you help me along what the "inputs" are, here? I presume just "f", which is a reference to some unknown function.<br>
And the "outputs" here are, presumably, just the result, because no operand is modified here.<br>
Now the definition tells me the thing is equality preserving if I get repeatably equal "To" prvalue objects given equal "f" (reference) inputs. That seems to be wrong, because it does not consider the "From" values at all. Surely, different "To" values are expected for differing "From" values?</p>
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      <p dir="auto">The "operands"/"inputs"/"outputs" wording in <code class="notranslate">concepts.general.equality</code> is still somewhat soft and in need of clarification: it's incredibly hard to specify without exploding the text into full mathematical rigor that would be unacceptable for the IS. My mildly hand-wavy response is that I would consider both <code class="notranslate">f</code> and <code class="notranslate">f()</code> to be operands of this expression pattern.</p>
<p dir="auto">The prose does try to clarify this:</p>
<div class="highlight highlight-text-tex-latex notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="and let `\tcode{f}` be a function with no arguments and return type \tcode{From}
such that \tcode{f()} is equality-preserving.
\tcode{ConvertibleTo&lt;From, To&gt;} is satisfied only if:"><pre class="notranslate">and let `<span class="pl-c1">\tcode</span>{f}` be a function with no arguments and return type <span class="pl-c1">\tcode</span>{From}
such that <span class="pl-c1">\tcode</span>{f()} is equality-preserving.
<span class="pl-c1">\tcode</span>{ConvertibleTo&lt;From, To&gt;} is satisfied only if:</pre></div>
<p dir="auto">but there's no correspondence established between <code class="notranslate">f</code> in the concept definition and this <code class="notranslate">f</code>. I suppose we could clarify in the concept definition itself:</p>
<div class="highlight highlight-source-c++ notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="template &lt;class From, class To&gt;
concept ConvertibleTo = is_convertible_v&lt;From, To&gt; &amp;&amp;
  requires(From (&amp;f)()) { // f is an arbitrary function such that f() is an equality-preserving expression
    static_cast&lt;To&gt;(f());
  };"><pre class="notranslate"><span class="pl-k">template </span>&lt;<span class="pl-k">class</span> <span class="pl-en">From</span>, <span class="pl-k">class</span> <span class="pl-en">To</span>&gt;
<span class="pl-k">concept </span>ConvertibleTo = is_convertible_v&lt;From, To&gt; &amp;&amp;
  <span class="pl-en">requires</span>(From (&amp;f)()) { <span class="pl-c"><span class="pl-c">//</span> f is an arbitrary function such that f() is an equality-preserving expression</span>
    <span class="pl-k">static_cast</span>&lt;To&gt;(<span class="pl-c1">f</span>());
  };</pre></div>
<p dir="auto">Would you consider that an improvement?</p>
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      <p dir="auto">"f is an arbitrary function" -&gt; "f refers to an arbitrary function" (f is still a reference, not a function). Otherwise looks like an improvement.</p>
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              <span class="blob-code-inner blob-code-marker-addition">The <span class="pl-c1">\tcode</span>{UniformRandomBitGenerator} concept is a slight relaxation of the uniform random bit generator requirements, in that it does not require a nested <span class="pl-c1">\grammarterm</span>{typedef-name} <span class="pl-c1">\tcode</span>{result_type}.</span>

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          <p dir="auto">Please rebase and add the feature-test macro (is there any?), now that the basic infrastructure for feature-test macros has been merged.</p>
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          <p dir="auto">Pushing what I have so far. I still need to <del>fix the definition of "expression-equivalent" and</del> cleanup the weird use of "if and only if" in <code class="notranslate">Common</code> and <code class="notranslate">CommonReference</code>, and we haven't reached a decision about renaming the "old concept" subclauses to "<em>Cpp98Foo</em> requirements".</p>
<p dir="auto">EDIT: We can now remove the needs-rabase label.</p>
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          <p dir="auto">Sorry, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a>, github still tells me there are conflicts that need a rebase.</p>
<p dir="auto">To clarify the rules on "Fixup" vs. regular commits: "Fixup" is stuff that would have been in another commit if the typist of the commit wouldn't have made a dumb mistake. That includes fixing typos (commas, misspellings) and incorrect transcriptions from the incoming paper. For example, the move of the "random" synopsis is a "fixup", as is the \oldconcept stuff and the \defnx and \ref / \iref stuff and \placeholder. (Note that the point-of-reference for "fixup" is the rendered text, not the situation of the LaTeX source.)</p>
<p dir="auto">The change of the section labels should come right after that in a separate commit.</p>
<p dir="auto">Adding "Note C" and "Note D" (or striking a superfluous sentence), in contrast, is not a fixup, but a separate editorial rephrasing that should follow our regular commit guidelines. For example, start the commit comment with [section.label].</p>
<p dir="auto">As agreed with <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/zygoloid/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/zygoloid">@zygoloid</a>, the feature-test macro is not a fixup because the actual wording diff was not in the incoming paper (for lack of a reference in the working draft).</p>
<p dir="auto">Yes, you'll need to git push --force-with-lease the rephrasing of the commit logs that I ask for here. Since you'll be doing that, you might as well fold the real fixups into the commits they refer to --- but some of your "fixup"s are actually editorial rephrasings.</p>
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<p dir="auto">Sorry, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/CaseyCarter/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/CaseyCarter">@CaseyCarter</a>, github still tells me there are conflicts that need a rebase.</p>
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<p dir="auto">I shouldn't have bothered to ask: I'm touching enough that virtually every commit causes a conflict.</p>
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<p dir="auto">To clarify the rules on "Fixup" vs. regular commits: ...</p>
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<p dir="auto">Thank you for the clarification. I'll clean up the commit history.</p>
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        <a href="#issuecomment-399218073" id="issuecomment-399218073-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-21T19:34:28Z" class="no-wrap">Jun 21, 2018</relative-time></a>


      
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          <p dir="auto">The commit history has been so rewritten - after two broken attempts. Apologies for the commit spam.</p>
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Add macro \libconcept to tag references to library concepts." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/2d4e82c4bd5679a4b8c1b17789150d76edcf8b29">[P0898R3] Standard Library Concepts: full wording</a>
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          <a href="/cplusplus/draft/pull/2176/commits/2d4e82c4bd5679a4b8c1b17789150d76edcf8b29" class="Link--secondary">2d4e82c</a>
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      <pre class="color-fg-muted ws-pre-wrap">Add macro \libconcept to tag references to library concepts.</pre>
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      <pre class="color-fg-muted ws-pre-wrap">…is document"</pre>
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          <a title="[concepts.lib.general.equality] Hyphenate equality-preserving" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/e800697d814ea7ca6fb6e8283f9d3906b0ab9d40">[concepts.lib.general.equality] Hyphenate equality-preserving</a>
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          <a href="/cplusplus/draft/pull/2176/commits/e800697d814ea7ca6fb6e8283f9d3906b0ab9d40" class="Link--secondary">e800697</a>
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        <code>
          <a title="[concepts] Shorten stable names:

* Remove &quot;.lib&quot;
* Replace &quot;concepts.&quot; with &quot;concept.&quot; in the stable names of the subclauses that define specific concepts, and remove the &quot;collection&quot; tags (&quot;.corelang&quot;, &quot;.object&quot;, &quot;.compare&quot;, &quot;.callable&quot;) so e.g. [concepts.lib.corelang.same] becomes [concept.same]
* Replace &quot;.corelang&quot; with &quot;.lang&quot;
* Rename [concepts.lib.synopsis] to [concepts.syn]
* Rename [concepts.lib.corelang.signedintegral] to [concepts.signed.int]
* Rename [concepts.lib.corelang.unsignedintegral] to [concepts.unsigned.int]" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/19d2ed00f8fe4d4fdd2efc81316068ab1f21d59e">[concepts] Shorten stable names:</a>
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      <pre class="color-fg-muted ws-pre-wrap">* Remove ".lib"
* Replace "concepts." with "concept." in the stable names of the subclauses that define specific concepts, and remove the "collection" tags (".corelang", ".object", ".compare", ".callable") so e.g. [concepts.lib.corelang.same] becomes [concept.same]
* Replace ".corelang" with ".lang"
* Rename [concepts.lib.synopsis] to [concepts.syn]
* Rename [concepts.lib.corelang.signedintegral] to [concepts.signed.int]
* Rename [concepts.lib.corelang.unsignedintegral] to [concepts.unsigned.int]</pre>
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        <code>
          <a title="[concepts.lang] Retitle as &quot;Language-related concepts&quot;" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/e9c46ddeffde70c2b1fd298391af2f6450203641">[concepts.lang] Retitle as "Language-related concepts"</a>
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          <a title="[support.limits.general] Add feature test macro __cpp_lib_concepts for P0898R3" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/31682fb92ff48b484223be0439345184f3ea681f">[support.limits.general] Add feature test macro __cpp_lib_concepts fo…</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/31682fb92ff48b484223be0439345184f3ea681f" class="Link--secondary">31682fb</a>
        </code>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…r P0898R3</pre>
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        <code>
          <a title="[concepts] Rephrase ocurrences of &quot;must&quot;" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/9ad9c1359ed135e13b2e99588c95aada057552a8">[concepts] Rephrase ocurrences of "must"</a>
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          <a href="/cplusplus/draft/pull/2176/commits/9ad9c1359ed135e13b2e99588c95aada057552a8" class="Link--secondary">9ad9c13</a>
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        <code>
          <a title="[definitions] redefine expression-equivalent per ISO directives

To be replaceable in context, and add a clarifying example." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/d8db67fa5c90396d4c46a8b6af94534b6fd9ebcc">[definitions] redefine expression-equivalent per ISO directives</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/d8db67fa5c90396d4c46a8b6af94534b6fd9ebcc" class="Link--secondary">d8db67f</a>
        </code>
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      <pre class="color-fg-muted ws-pre-wrap">To be replaceable in context, and add a clarifying example.</pre>
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</a>  </div>
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      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="[customization.point.object][meta.trans.other] Replace &quot;user-defined&quot; added by P0898R3 with &quot;program-defined&quot;

...to be consistent with the intent of LWG2139" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/d3c70aad615b0e72853ac11340b6e60d3bc34703">[customization.point.object][meta.trans.other] Replace "user-defined"…</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/d3c70aad615b0e72853ac11340b6e60d3bc34703" class="Link--secondary">d3c70aa</a>
        </code>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">… added by P0898R3 with "program-defined"

...to be consistent with the intent of LWG2139</pre>
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        <code>
          <a title="[concepts.swappable] Correct example" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/245a8e3a79224246fa0d0e540aeb4eece6a8b242">[concepts.swappable] Correct example</a>
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          <a title="[concepts.general][library.general] concepts constrain template arguments, not parameters" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/d5e62d67d5fb2d6037cb9735d5e606fe8469b85b">[concepts.general][library.general] concepts constrain template argum…</a>
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          <a href="/cplusplus/draft/pull/2176/commits/d5e62d67d5fb2d6037cb9735d5e606fe8469b85b" class="Link--secondary">d5e62d6</a>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…ents, not parameters</pre>
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        <code>
          <a title="[concept.convertibleto] Add clarifying comment" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/0301e375e4ebc2ec358079b18b376222bae2c554">[concept.convertibleto] Add clarifying comment</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/0301e375e4ebc2ec358079b18b376222bae2c554" class="Link--secondary">0301e37</a>
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        <code>
          <a title="[structure.requirements] Rephrase para 8 for clarity" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/e0aa860c007e9d064b9258c5deec201d0333b043">[structure.requirements] Rephrase para 8 for clarity</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/e0aa860c007e9d064b9258c5deec201d0333b043" class="Link--secondary">e0aa860</a>
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        <code>
          <a title="[meta.trans.other] make style of common_type and common_reference consistent

...by tagging the specification of common_reference with &quot;Note C&quot; and basic_common_reference &quot;Note D&quot;.

Also remove the allowance to specialize basic_common_reference &quot;if at least one template parameter in the specialization depends on a program-defined type&quot;; it&#39;s redundant with &quot;...pursuant to [namespace.std]&quot;. (This is consistent with `common_type`&#39;s wording.)" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/a9113be4514c71e56458bfdcd03f0871df8bed69">[meta.trans.other] make style of common_type and common_reference con…</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/a9113be4514c71e56458bfdcd03f0871df8bed69" class="Link--secondary">a9113be</a>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…sistent

...by tagging the specification of common_reference with "Note C" and basic_common_reference "Note D".

Also remove the allowance to specialize basic_common_reference "if at least one template parameter in the specialization depends on a program-defined type"; it's redundant with "...pursuant to [namespace.std]". (This is consistent with `common_type`'s wording.)</pre>
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      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="[meta.trans.other] Remove basic_common_reference requirement with no normative effect

...except to make some programs ill-formed NDR. Also clarify that users may *partially* specialize basic_common_reference." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/089a362b078e512a769847a96adc10024225f42b">[meta.trans.other] Remove basic_common_reference requirement with no …</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/089a362b078e512a769847a96adc10024225f42b" class="Link--secondary">089a362</a>
        </code>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…normative effect

...except to make some programs ill-formed NDR. Also clarify that users may *partially* specialize basic_common_reference.</pre>
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        <code>
          <a title="[rand.req.urng] Rework URBG requirements for clarity and simplicitly

... by removing the redundance between the new concept and the &quot;old&quot; requirements.

Also fixup the reference in [rand.req.eng] to properly refer [rand.req.urng] instead of the requirements table. The table has been removed, and the reference should have been to the subclause in the first place to clearly incorporate the requirements outside of the table." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/939e8dcfe8cabd2a36f12de3b415035fde3b0f41">[rand.req.urng] Rework URBG requirements for clarity and simplicitly</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/939e8dcfe8cabd2a36f12de3b415035fde3b0f41" class="Link--secondary">939e8dc</a>
        </code>
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    </div>
  </div>
    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">... by removing the redundance between the new concept and the "old" requirements.

Also fixup the reference in [rand.req.eng] to properly refer [rand.req.urng] instead of the requirements table. The table has been removed, and the reference should have been to the subclause in the first place to clearly incorporate the requirements outside of the table.</pre>
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</a>  </div>
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      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="[meta.trans.other] Simplify common_type

... by replacing &quot;a type \tcode{U} such that \tcode{is_same_v&lt;U, remove_cvref_t&lt;U&gt;&gt;} is \tcode{true}&quot; with &quot;a non-reference cv-unqualified type \tcode{U}&quot;" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/a9981a4425ea3647f08f438e4233407034213ebb">[meta.trans.other] Simplify common_type</a>
        </code>

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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/a9981a4425ea3647f08f438e4233407034213ebb" class="Link--secondary">a9981a4</a>
        </code>
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    </div>
  </div>
    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">... by replacing "a type \tcode{U} such that \tcode{is_same_v&lt;U, remove_cvref_t&lt;U&gt;&gt;} is \tcode{true}" with "a non-reference cv-unqualified type \tcode{U}"</pre>
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</div>

      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="[concepts] Replace &quot;template &lt;&quot; with &quot;template&lt;&quot;

Also fix occurrences introduced by P898R3 in [rand.synopsis], [rand.req.urng], [func.identity], [meta.type.synop], and [meta.trans.other]" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/ebe222d20ff0107e04c629b33396c4bd60a5891a">[concepts] Replace "template &lt;" with "template&lt;"</a>
        </code>

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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/ebe222d20ff0107e04c629b33396c4bd60a5891a" class="Link--secondary">ebe222d</a>
        </code>
      </div>
    </div>
  </div>
    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">Also fix occurrences introduced by P898R3 in [rand.synopsis], [rand.req.urng], [func.identity], [meta.type.synop], and [meta.trans.other]</pre>
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      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="[concepts.syn] Remove trailing &quot;:&quot; from reference comments in synopsis

Also fix one occurrence in [functional.syn] introduced by P898R3." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/53b285d3293bf1e1f727bd6f698e2db67914b035">[concepts.syn] Remove trailing ":" from reference comments in synopsis</a>
        </code>

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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/53b285d3293bf1e1f727bd6f698e2db67914b035" class="Link--secondary">53b285d</a>
        </code>
      </div>
    </div>
  </div>
    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">Also fix one occurrence in [functional.syn] introduced by P898R3.</pre>
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      <div class="pr-1 flex-auto min-width-0" >
        <code>
          <a title="macros.tex: change the \oldconcept prefix to &quot;Cpp17&quot;

Also update &quot;Cpp98&quot;s in the text to &quot;Cpp17&quot; to agree." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/acb06e37dd73add5f829a130522aa7db515ca92a">macros.tex: change the \oldconcept prefix to "Cpp17"</a>
        </code>

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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/acb06e37dd73add5f829a130522aa7db515ca92a" class="Link--secondary">acb06e3</a>
        </code>
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  </div>
    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">Also update "Cpp98"s in the text to "Cpp17" to agree.</pre>
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        <code>
          <a title="[concepts] There need be no &quot;there need be no subsumption relationship&quot;

... the core language rules already imply it." data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/7677798914c93e6bc3b335a01bff54194e0996fa">[concepts] There need be no "there need be no subsumption relationship"</a>
        </code>

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          <a href="/cplusplus/draft/pull/2176/commits/7677798914c93e6bc3b335a01bff54194e0996fa" class="Link--secondary">7677798</a>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">... the core language rules already imply it.</pre>
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        <code>
          <a title="[concepts.integral] Merge [concept.integral], [concept.signed.int] and [concept.unsigned.int]" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/6523119e1da32665449effdd155cd10559ae7473">[concepts.integral] Merge [concept.integral], [concept.signed.int] an…</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/6523119e1da32665449effdd155cd10559ae7473" class="Link--secondary">6523119</a>
        </code>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…d [concept.unsigned.int]</pre>
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        <code>
          <a title="[structure.requirements] new para that explains the typographical convention for requirement names" data-pjax="true" class="Link--secondary markdown-title" href="/cplusplus/draft/pull/2176/commits/11877fc6555180e5aef6f552b838724f7244840b">[structure.requirements] new para that explains the typographical con…</a>
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        <code>
          <a href="/cplusplus/draft/pull/2176/commits/11877fc6555180e5aef6f552b838724f7244840b" class="Link--secondary">11877fc</a>
        </code>
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    <div class="Details-content--hidden mt-2">
      <pre class="color-fg-muted ws-pre-wrap">…vention for requirement names</pre>
    </div>
</div>

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        <a href="#issuecomment-400121781" id="issuecomment-400121781-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2018-06-25T22:57:23Z" class="no-wrap">Jun 25, 2018</relative-time></a>


      
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    <button
      type="button"
      class="Link--secondary underline-on-hover border-0 p-0 color-bg-transparent text-left"
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      data-analytics-event="{&quot;location&quot;:&quot;footer&quot;,&quot;action&quot;:&quot;dont_share_info&quot;,&quot;context&quot;:&quot;subfooter&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;dont_share_info_link_subfooter_footer&quot;}"
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    <ghcc-consent id="ghcc" class="position-fixed bottom-0 left-0" style="z-index: 999999"
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  <div id="ajax-error-message" class="ajax-error-message flash flash-error" hidden>
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</svg>
      </button>
      <div class="octocat-spinner my-6 js-details-dialog-spinner"></div>
    </details-dialog>
  </details>
</template>

    <div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;">
  <div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;">
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</div>

    <template id="snippet-clipboard-copy-button">
  <div class="zeroclipboard-container position-absolute right-0 top-0">
    <clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w">
      <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
</svg>
      <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2">
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</svg>
    </clipboard-copy>
  </div>
</template>
<template id="snippet-clipboard-copy-button-unpositioned">
  <div class="zeroclipboard-container">
    <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w">
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</svg>
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</svg>
    </clipboard-copy>
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</template>




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