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  <title>[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function CWG2546 · Issue #5336 · cplusplus/draft · GitHub</title>



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    <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>

                  </ul>
                </div>
                <div class="border-bottom border-lg-bottom-0 pb-lg-0 pb-3">

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

                  <ul class="list-style-none f5" aria-labelledby="platform-integrations-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;github_marketplace&quot;,&quot;context&quot;:&quot;platform&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;github_marketplace_link_platform_navbar&quot;}" href="https://github.com/marketplace">
      GitHub Marketplace

    
</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;mcp_registry&quot;,&quot;context&quot;:&quot;platform&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;mcp_registry_link_platform_navbar&quot;}" href="https://github.com/mcp">
      MCP Registry

    
</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_features&quot;,&quot;context&quot;:&quot;platform&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;view_all_features_link_platform_navbar&quot;}" href="https://github.com/features">
              View all features
              <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">
        Solutions
        <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 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="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

    
</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;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

    
</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;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>
                </div>
            </div>
            <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>

                      <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;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>

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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;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

    
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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;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>

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            </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">
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      <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" >
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  <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">
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</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">
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</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>

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  <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">
          Premium Support

        </div>

        Enterprise-grade 24/7 support
      </div>

    
</a></li>

                  </ul>
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        </div>

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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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<qbsearch-input class="search-input" data-scope="repo:cplusplus/draft" data-custom-scopes-path="/search/custom_scopes" data-delete-custom-scopes-csrf="dP2vG7zHs15uOboAN0evX-H48xm1rsrBqoRxLpIMUJgKbV1FRh4jWdqTDQrMP4VRhu7De2n3a1kgsT3gj9kFKg" 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-827c257a-07b4-4509-bee2-6e52851de821" 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">
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</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>
</svg>
</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>
</svg>
</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>
</svg>
</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>
</svg>
</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>
</svg>
</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>
</svg>
</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>
</svg>
</template>

<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>
</svg>
</template>

<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="server-icon">
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<template id="globe-icon">
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<template id="device-mobile-icon">
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<template id="package-icon">
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<template id="credit-card-icon">
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<template id="play-icon">
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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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                  "
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<dialog-helper>
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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"
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                class="form-control"
                autocomplete="off"
                placeholder="github-ruby"
                required
                maxlength="50">
              <input type="hidden" data-csrf="true" value="fezR+Z48toHI9eU5IOZsZ0tDqRcstjZ29tDhpLca7e5G5HTrjVLhfFc2GMiY1H+CuLAZ1sSsP0NNEyTs43AP3Q==" />
            </auto-check>
          </div>

          <div class="form-group">
            <label for="custom_scope_query">Query</label>
            <input
              type="text"
              name="custom_scope_query"
              id="custom_scope_query"
              data-target="custom-scopes.customScopesQueryField"
              class="form-control"
              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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      <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
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          <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
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                data-analytics-event="{&quot;category&quot;:&quot;Marketing nav&quot;,&quot;action&quot;:&quot;click to go to homepage&quot;,&quot;label&quot;:&quot;ref_page:Marketing;ref_cta:Sign in;ref_loc:Header&quot;}"
              >
                Sign in
              </a>
            </div>

              <a href="/signup?ref_cta=Sign+up&amp;ref_loc=header+logged+out&amp;ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fvoltron%2Fissues_fragments%2Fissue_layout&amp;source=header-repo&amp;source_repo=cplusplus%2Fdraft"
                class="HeaderMenu-link HeaderMenu-link--sign-up HeaderMenu-button flex-shrink-0 d-flex d-lg-inline-flex no-underline border color-border-default rounded px-2 py-1"
                data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;site header menu&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;SIGN_UP&quot;,&quot;originating_url&quot;:&quot;https://github.com/cplusplus/draft/issues/5336&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="4c0a05d2a0b9f3a657720ac8e40453f4972a254baf335f762e3be7d1ad5e8905"
                data-analytics-event="{&quot;category&quot;:&quot;Sign up&quot;,&quot;action&quot;:&quot;click to sign up for account&quot;,&quot;label&quot;:&quot;ref_page:/&lt;user-name&gt;/&lt;repo-name&gt;/voltron/issues_fragments/issue_layout;ref_cta:Sign up;ref_loc:header logged out&quot;}"
              >
                Sign up
              </a>

                <div class="AppHeader-appearanceSettings">
    <react-partial-anchor>
      <button data-target="react-partial-anchor.anchor" id="icon-button-bd8d1f07-2ad2-4366-9573-c0fc08bf5f42" aria-labelledby="tooltip-7ef9aaac-9d56-4acd-87b1-e4769567f444" type="button" disabled="disabled" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium AppHeader-button HeaderMenu-link border cursor-wait">  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-sliders Button-visual">
    <path d="M15 2.75a.75.75 0 0 1-.75.75h-4a.75.75 0 0 1 0-1.5h4a.75.75 0 0 1 .75.75Zm-8.5.75v1.25a.75.75 0 0 0 1.5 0v-4a.75.75 0 0 0-1.5 0V2H1.75a.75.75 0 0 0 0 1.5H6.5Zm1.25 5.25a.75.75 0 0 0 0-1.5h-6a.75.75 0 0 0 0 1.5h6ZM15 8a.75.75 0 0 1-.75.75H11.5V10a.75.75 0 1 1-1.5 0V6a.75.75 0 0 1 1.5 0v1.25h2.75A.75.75 0 0 1 15 8Zm-9 5.25v-2a.75.75 0 0 0-1.5 0v1.25H1.75a.75.75 0 0 0 0 1.5H4.5v1.25a.75.75 0 0 0 1.5 0v-2Zm9 0a.75.75 0 0 1-.75.75h-6a.75.75 0 0 1 0-1.5h6a.75.75 0 0 1 .75.75Z"></path>
</svg>
</button><tool-tip id="tooltip-7ef9aaac-9d56-4acd-87b1-e4769567f444" for="icon-button-bd8d1f07-2ad2-4366-9573-c0fc08bf5f42" popover="manual" data-direction="s" data-type="label" data-view-component="true" class="sr-only position-absolute">Appearance settings</tool-tip>

      <template data-target="react-partial-anchor.template">
        <link crossorigin="anonymous" media="all" rel="stylesheet" href="https://github.githubassets.com/assets/appearance-settings.6c63a6de228d6520804d.module.css" />

<react-partial
  partial-name="appearance-settings"
  data-ssr="false"
  data-attempted-ssr="false"
  data-react-profiling="false"
>
  
  <script type="application/json" data-target="react-partial.embeddedData">{"props":{}}</script>
  <div data-target="react-partial.reactRoot"></div>
</react-partial>


      </template>
    </react-partial-anchor>
  </div>

          <button type="button" class="sr-only js-header-menu-focus-trap d-block d-lg-none">Resetting focus</button>
        </div>
      </div>
    </div>
  </div>
</header>

      <div hidden="hidden" data-view-component="true" class="js-stale-session-flash stale-session-flash flash flash-warn flash-full">
  
        <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert">
    <path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path>
</svg>
        <span class="js-stale-session-flash-signed-in" hidden>You signed in with another tab or window. <a class="Link--inTextBlock" href="">Reload</a> to refresh your session.</span>
        <span class="js-stale-session-flash-signed-out" hidden>You signed out in another tab or window. <a class="Link--inTextBlock" href="">Reload</a> to refresh your session.</span>
        <span class="js-stale-session-flash-switched" hidden>You switched accounts on another tab or window. <a class="Link--inTextBlock" href="">Reload</a> to refresh your session.</span>

    <button id="icon-button-374af0f7-b0e1-49ea-bdca-7ff38bcf55c1" aria-labelledby="tooltip-c4c8d078-7f17-4338-9bc6-7031132f8480" type="button" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium flash-close js-flash-close">  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x Button-visual">
    <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><tool-tip id="tooltip-c4c8d078-7f17-4338-9bc6-7031132f8480" for="icon-button-374af0f7-b0e1-49ea-bdca-7ff38bcf55c1" popover="manual" data-direction="s" data-type="label" data-view-component="true" class="sr-only position-absolute">Dismiss alert</tool-tip>


  
</div>
    </div>

  <div id="start-of-content" class="show-on-focus"></div>








    <div id="js-flash-container" class="flash-container" data-turbo-replace>




  <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/issues/5336&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="c73aa7d316e8ba231b5553a26d2e64615c649452d952b4324f404683df3787e8" 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">
    <path d="M8 16a2 2 0 0 0 1.985-1.75c.017-.137-.097-.25-.235-.25h-3.5c-.138 0-.252.113-.235.25A2 2 0 0 0 8 16ZM3 5a5 5 0 0 1 10 0v2.947c0 .05.015.098.042.139l1.703 2.555A1.519 1.519 0 0 1 13.482 13H2.518a1.516 1.516 0 0 1-1.263-2.36l1.703-2.554A.255.255 0 0 0 3 7.947Zm5-3.5A3.5 3.5 0 0 0 4.5 5v2.947c0 .346-.102.683-.294.97l-1.703 2.556a.017.017 0 0 0-.003.01l.001.006c0 .002.002.004.004.006l.006.004.007.001h10.964l.007-.001.006-.004.004-.006.001-.007a.017.017 0 0 0-.003-.01l-1.703-2.554a1.745 1.745 0 0 1-.294-.97V5A3.5 3.5 0 0 0 8 1.5Z"></path>
</svg>Notifications
</a>    <tool-tip id="tooltip-b8acf778-ad05-49e6-b828-be61cb4f7b7e" 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/issues/5336&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="fb0fa1b352a59b2fa50c39bfe5ca3467a13ef59e986def3b51d2fd402354beae" 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/issues/5336&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="b15370ada3db6665b624b3e6e0f3423a8995cc38cf08ca72ea1e4f96c3967eea" 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>
  </li>

</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">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code UnderlineNav-octicon d-none d-sm-inline">
    <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>
        <span data-content="Code">Code</span>
          <span id="code-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="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;}" 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-issue-opened UnderlineNav-octicon d-none d-sm-inline">
    <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>
</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;}" 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-git-pull-request UnderlineNav-octicon d-none d-sm-inline">
    <path d="M1.5 3.25a2.25 2.25 0 1 1 3 2.122v5.256a2.251 2.251 0 1 1-1.5 0V5.372A2.25 2.25 0 0 1 1.5 3.25Zm5.677-.177L9.573.677A.25.25 0 0 1 10 .854V2.5h1A2.5 2.5 0 0 1 13.5 5v5.628a2.251 2.251 0 1 1-1.5 0V5a1 1 0 0 0-1-1h-1v1.646a.25.25 0 0 1-.427.177L7.177 3.427a.25.25 0 0 1 0-.354ZM3.75 2.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm0 9.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm8.25.75a.75.75 0 1 0 1.5 0 .75.75 0 0 0-1.5 0Z"></path>
</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>
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  <script type="application/json" data-target="react-app.embeddedData">{"payload":{"preloaded_records":{},"structured_data":{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function CWG2546","articleBody":"[class.compare.default] p1 just says\r\n\u003e A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is [implicitly defined](https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined) when it is **odr-used** or **needed for constant evaluation**[.](https://eel.is/c++draft/class.compare#default-1.sentence-2)\r\n\r\nConsider this example\r\n````cpp\r\nstruct HasNoLessThan { };\r\nstruct C{\r\n    friend HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026);\r\n    bool operator \u003c(C const\u0026) const /*noexcept*/ = default;\r\n};\r\nint main(){\r\n   using ptr = decltype(\u0026C::operator\u003c); // #1\r\n}\r\n````\r\nSince `\u0026C::operator\u003c` appears as an unevaluated operand, function `C::operator \u003c` is not odr-used by this expression. However, Clang reports a diagnosis that: \r\n\u003e in evaluation of exception specification for 'C::operator\u003c' needed here  \r\n\r\n[except.spec] p11 says\r\n\u003e The exception specification for a comparison operator function ([over.binary]) without a noexcept-specifier that is defaulted on its first declaration is potentially-throwing if and only if **any expression in the implicit definition is potentially-throwing**.\r\n\r\nSo, It is reasonable to check the definition of the defaulted function. However, we just define two contexts that can cause the implicit definition for the defaulted function. Checking the expressions in the implicit definition is not defined to be odr-used nor constant evaluation of the function. It seems that we lack the case that determines the exception specification of a defaulted comparison operator function.\r\n\r\n\r\nImprovement: \r\n\u003e A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is [implicitly defined](https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined) when it is odr-used, needed for constant evaluation, or needed to determine exception specification(if necessary)[.](https://eel.is/c++draft/class.compare#default-1.sentence-2)","author":{"url":"https://github.com/xmh0511","@type":"Person","name":"xmh0511"},"datePublished":"2022-03-07T03:25:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/5336/draft/issues/5336"},"preloadedQueries":[{"queryId":"cee21fcf82c877ad153a2db35b36eb94","queryName":"IssueViewerViewQuery","variables":{"count":15,"id":"repository","number":5336,"owner":"cplusplus","repo":"draft"},"result":{"data":{"repository":{"isOwnerEnterpriseManaged":false,"issue":{"id":"I_kwDOACHROc5FMT9T","updatedAt":"2024-04-28T20:30:13Z","title":"[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function CWG2546","number":5336,"repository":{"nameWithOwner":"cplusplus/draft","id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","login":"cplusplus","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","url":"https://github.com/cplusplus","databaseId":59276},"isArchived":false,"isPrivate":false,"databaseId":2216249,"slashCommandsEnabled":false,"visibility":"PUBLIC","viewerCanPush":false,"viewerCanInteract":false,"viewerInteractionLimitReasonHTML":"","planFeatures":{"maximumAssignees":10},"isCopilotAgentEnabled":null,"pinnedIssues":{"totalCount":0},"viewerCanPinIssues":false,"viewerIssueCreationPermissions":{"triageable":false},"issueTypes":{"edges":[{"node":{"id":"IT_kwDN54zOAAFvmw"}},{"node":{"id":"IT_kwDN54zOAAFvnQ"}},{"node":{"id":"IT_kwDN54zOAAFvog"}}]}},"titleHTML":"[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function CWG2546","url":"https://github.com/cplusplus/draft/issues/5336","viewerCanUpdateNext":false,"issueType":null,"state":"CLOSED","stateReason":"COMPLETED","duplicateOf":null,"linkedPullRequests":{"nodes":[{"repository":{"nameWithOwner":"cplusplus/draft","id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","login":"cplusplus","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2"}},"state":"MERGED","isDraft":false,"url":"https://github.com/cplusplus/draft/pull/6906","number":6906,"id":"PR_kwDOACHROc5q5jnf"}]},"subIssuesSummary":{"total":0,"completed":0},"__isLabelable":"Issue","labels":{"edges":[{"node":{"id":"MDU6TGFiZWw1NzcwMDEwNQ==","color":"bfd4f2","name":"cwg","nameHTML":"cwg","description":"Issue must be reviewed by CWG.","url":"https://github.com/cplusplus/draft/labels/cwg","__typename":"Label"},"cursor":"MQ"}],"pageInfo":{"endCursor":"MQ","hasNextPage":false}},"__isNode":"Issue","assignedActors":{"nodes":[]},"milestone":null,"databaseId":1160855379,"viewerDidAuthor":false,"locked":false,"author":{"__typename":"User","__isActor":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx","profileUrl":"https://github.com/xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4"},"__isComment":"Issue","body":"[class.compare.default] p1 just says\r\n\u003e A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is [implicitly defined](https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined) when it is **odr-used** or **needed for constant evaluation**[.](https://eel.is/c++draft/class.compare#default-1.sentence-2)\r\n\r\nConsider this example\r\n````cpp\r\nstruct HasNoLessThan { };\r\nstruct C{\r\n    friend HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026);\r\n    bool operator \u003c(C const\u0026) const /*noexcept*/ = default;\r\n};\r\nint main(){\r\n   using ptr = decltype(\u0026C::operator\u003c); // #1\r\n}\r\n````\r\nSince `\u0026C::operator\u003c` appears as an unevaluated operand, function `C::operator \u003c` is not odr-used by this expression. However, Clang reports a diagnosis that: \r\n\u003e in evaluation of exception specification for 'C::operator\u003c' needed here  \r\n\r\n[except.spec] p11 says\r\n\u003e The exception specification for a comparison operator function ([over.binary]) without a noexcept-specifier that is defaulted on its first declaration is potentially-throwing if and only if **any expression in the implicit definition is potentially-throwing**.\r\n\r\nSo, It is reasonable to check the definition of the defaulted function. However, we just define two contexts that can cause the implicit definition for the defaulted function. Checking the expressions in the implicit definition is not defined to be odr-used nor constant evaluation of the function. It seems that we lack the case that determines the exception specification of a defaulted comparison operator function.\r\n\r\n\r\nImprovement: \r\n\u003e A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is [implicitly defined](https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined) when it is odr-used, needed for constant evaluation, or needed to determine exception specification(if necessary)[.](https://eel.is/c++draft/class.compare#default-1.sentence-2)","bodyHTML":"\u003cp dir=\"auto\"\u003e[class.compare.default] p1 just says\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is \u003ca href=\"https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined\" rel=\"nofollow\"\u003eimplicitly defined\u003c/a\u003e when it is \u003cstrong\u003eodr-used\u003c/strong\u003e or \u003cstrong\u003eneeded for constant evaluation\u003c/strong\u003e\u003ca href=\"https://eel.is/c++draft/class.compare#default-1.sentence-2\" rel=\"nofollow\"\u003e.\u003c/a\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eConsider this example\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"struct HasNoLessThan { };\nstruct C{\n    friend HasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;);\n    bool operator \u0026lt;(C const\u0026amp;) const /*noexcept*/ = default;\n};\nint main(){\n   using ptr = decltype(\u0026amp;C::operator\u0026lt;); // #1\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eHasNoLessThan\u003c/span\u003e { };\n\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eC\u003c/span\u003e{\n    \u003cspan class=\"pl-k\"\u003efriend\u003c/span\u003e HasNoLessThan \u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e \u0026lt;=\u0026gt;(C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;, C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;);\n    \u003cspan class=\"pl-k\"\u003ebool\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e \u0026lt;(C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;) \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e/*\u003c/span\u003enoexcept\u003cspan class=\"pl-c\"\u003e*/\u003c/span\u003e\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e;\n};\n\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emain\u003c/span\u003e(){\n   \u003cspan class=\"pl-k\"\u003eusing\u003c/span\u003e ptr = \u003cspan class=\"pl-c1\"\u003edecltype\u003c/span\u003e(\u0026amp;C::\u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e\u0026lt;); \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e #1\u003c/span\u003e\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSince \u003ccode class=\"notranslate\"\u003e\u0026amp;C::operator\u0026lt;\u003c/code\u003e appears as an unevaluated operand, function \u003ccode class=\"notranslate\"\u003eC::operator \u0026lt;\u003c/code\u003e is not odr-used by this expression. However, Clang reports a diagnosis that:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ein evaluation of exception specification for 'C::operator\u0026lt;' needed here\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e[except.spec] p11 says\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe exception specification for a comparison operator function ([over.binary]) without a noexcept-specifier that is defaulted on its first declaration is potentially-throwing if and only if \u003cstrong\u003eany expression in the implicit definition is potentially-throwing\u003c/strong\u003e.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSo, It is reasonable to check the definition of the defaulted function. However, we just define two contexts that can cause the implicit definition for the defaulted function. Checking the expressions in the implicit definition is not defined to be odr-used nor constant evaluation of the function. It seems that we lack the case that determines the exception specification of a defaulted comparison operator function.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eImprovement:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is \u003ca href=\"https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined\" rel=\"nofollow\"\u003eimplicitly defined\u003c/a\u003e when it is odr-used, needed for constant evaluation, or needed to determine exception specification(if necessary)\u003ca href=\"https://eel.is/c++draft/class.compare#default-1.sentence-2\" rel=\"nofollow\"\u003e.\u003c/a\u003e\u003c/p\u003e\n\u003c/blockquote\u003e","bodyVersion":"4e71ccc311be136cede74144f42781be4f4b8b2eed64aaf9e98948d14373061d","createdAt":"2022-03-07T03:25:18Z","__isReactable":"Issue","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"viewerCanUpdateMetadata":false,"viewerCanComment":false,"viewerCanAssign":false,"viewerCanLabel":false,"__isIssueOrPullRequest":"Issue","projectItemsNext":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"viewerCanSetMilestone":false,"isPinned":false,"viewerCanDelete":false,"viewerCanTransfer":false,"viewerCanConvertToDiscussion":false,"viewerCanLock":false,"viewerCanType":false,"viewerCanSetFields":false,"issueFieldValues":{"nodes":[]},"frontTimelineItems":{"pageInfo":{"hasNextPage":false,"endCursor":"Y3Vyc29yOnYyOpPPAAABjyZmq_ABqzEyNjM1ODAzMjUw"},"totalCount":13,"edges":[{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060168431,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"frederick-vs-ja","avatarUrl":"https://avatars.githubusercontent.com/u/23228989?v=4","profileUrl":"https://github.com/frederick-vs-ja","id":"MDQ6VXNlcjIzMjI4OTg5"},"id":"IC_kwDOACHROc4_MOLv","body":"[[dcl.fct.def.delete]/2](https://eel.is/c++draft/dcl.fct.def.delete#2)\r\n\u003e A program that refers to a deleted function implicitly or explicitly, other than to declare it, is ill-formed.\r\n\r\nSo even if the implicit exception specification is not needed, `decltype(\u0026C::operator\u003c)` is ill-formed.\r\n\r\nIIUC this is a bug of clang. Please report it [here](https://github.com/llvm/llvm-project/issues).","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca href=\"https://eel.is/c++draft/dcl.fct.def.delete#2\" rel=\"nofollow\"\u003e[dcl.fct.def.delete]/2\u003c/a\u003e\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA program that refers to a deleted function implicitly or explicitly, other than to declare it, is ill-formed.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSo even if the implicit exception specification is not needed, \u003ccode class=\"notranslate\"\u003edecltype(\u0026amp;C::operator\u0026lt;)\u003c/code\u003e is ill-formed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIIUC this is a bug of clang. Please report it \u003ca href=\"https://github.com/llvm/llvm-project/issues\"\u003ehere\u003c/a\u003e.\u003c/p\u003e","bodyVersion":"93b218381635335b50c3abbe80bd17ee20361575ea9eee359f067bda7cc2f1ca","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060168431","createdAt":"2022-03-07T04:08:40Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T04:09:16Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/frederick-vs-ja","login":"frederick-vs-ja","id":"MDQ6VXNlcjIzMjI4OTg5"},"id":"UCE_lALOACHROc4_MOLvziFtK8Q"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2KQoUAAqjEwNjAxNjg0MzE="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060199264,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"IC_kwDOACHROc4_MVtg","body":"\u003e [[dcl.fct.def.delete]/2](https://eel.is/c++draft/dcl.fct.def.delete#2)\r\n\u003e \r\n\u003e \u003e A program that refers to a deleted function implicitly or explicitly, other than to declare it, is ill-formed.\r\n\u003e \r\n\u003e So even if the implicit exception specification is not needed, `decltype(\u0026C::operator\u003c)` is ill-formed.\r\n\u003e \r\n\u003e IIUC this is a bug of clang. Please report it [here](https://github.com/llvm/llvm-project/issues).\r\n\r\nNo, the defaulted function is **not deleted**.  `HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)` is a usable candidate and a rewritten candidate for `x \u003c y`, as per [class.compare.secondary] p2 and [over.match.oper#3.4]. Instead, I think it is a bug of GCC, which says that defaulted operator function is deleted.","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://eel.is/c++draft/dcl.fct.def.delete#2\" rel=\"nofollow\"\u003e[dcl.fct.def.delete]/2\u003c/a\u003e\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA program that refers to a deleted function implicitly or explicitly, other than to declare it, is ill-formed.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSo even if the implicit exception specification is not needed, \u003ccode class=\"notranslate\"\u003edecltype(\u0026amp;C::operator\u0026lt;)\u003c/code\u003e is ill-formed.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIIUC this is a bug of clang. Please report it \u003ca href=\"https://github.com/llvm/llvm-project/issues\"\u003ehere\u003c/a\u003e.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eNo, the defaulted function is \u003cstrong\u003enot deleted\u003c/strong\u003e.  \u003ccode class=\"notranslate\"\u003eHasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)\u003c/code\u003e is a usable candidate and a rewritten candidate for \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e, as per [class.compare.secondary] p2 and [over.match.oper#3.4]. Instead, I think it is a bug of GCC, which says that defaulted operator function is deleted.\u003c/p\u003e","bodyVersion":"03ace6a1f01631f48255c3aed354bd306e25f807147f705cbc2ff67b220d9dc9","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060199264","createdAt":"2022-03-07T05:08:02Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T05:12:46Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"UCE_lALOACHROc4_MVtgziFtYiA"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2LG-1AAqjEwNjAxOTkyNjQ="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060236866,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"frederick-vs-ja","avatarUrl":"https://avatars.githubusercontent.com/u/23228989?v=4","profileUrl":"https://github.com/frederick-vs-ja","id":"MDQ6VXNlcjIzMjI4OTg5"},"id":"IC_kwDOACHROc4_Me5C","body":"Are you explaining why the comment in [class.compare.secondary] p3 is wrong? I believe it's right, extremely.\r\n\r\nWhen the rewritten candidate is found, a nested overload resolution is performed for the written expression and then fails. According to [[over.match.general] p4](https://eel.is/c++draft/over.match.general#4), the rewritten candidate is not usable.\r\n","bodyHTML":"\u003cp dir=\"auto\"\u003eAre you explaining why the comment in [class.compare.secondary] p3 is wrong? I believe it's right, extremely.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen the rewritten candidate is found, a nested overload resolution is performed for the written expression and then fails. According to \u003ca href=\"https://eel.is/c++draft/over.match.general#4\" rel=\"nofollow\"\u003e[over.match.general] p4\u003c/a\u003e, the rewritten candidate is not usable.\u003c/p\u003e","bodyVersion":"66246dab144d51f981e94002fb8b201b20abb09fb5d82f88a1e6d120876e1aa3","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060236866","createdAt":"2022-03-07T06:28:06Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2MQSPAAqjEwNjAyMzY4NjY="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060250481,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"IC_kwDOACHROc4_MiNx","body":"\u003e Are you explaining why the comment in [class.compare.secondary] p3 is wrong? I believe it's right, extremely.\r\n\u003e \r\n\u003e When the rewritten candidate is found, a nested overload resolution is performed for the written expression and then fails. According to [[over.match.general] p4](https://eel.is/c++draft/over.match.general#4), the rewritten candidate is not usable.\r\n\r\n\"the rewritten candidate is not usable\" No, it is usable. First, `HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)` is a candidate for `x \u003c y`, and all operands of the expression can be as the arguments in the call of `HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)` since the operands are of type `const C`. According to [over.match.general] p2 and [over.match.general] p3, `HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)` is the unique best viable function. Hence, the overload resolution succeeds. \r\n\r\n\r\n\u003e a nested overload resolution is performed for the written expression and then fails.\r\n\r\nIMO, overload resolution only considers the candidate itself. It shouldn't consider subsequent interpretation for the expression. The clue is here: \r\n\u003e If a rewritten operator\u003c=\u003e candidate is **selected by overload resolution** for an operator @, x @ y is interpreted as...\r\n\r\nThat is, only after the overload resolution for the expression `x@y` has succeeded and selected `rewritten operator\u003c=\u003e candidate` will further interpretation be done. [class.compare.secondary] p2 just requires that\r\n\u003e overload resolution ([over.match]), as applied to x @ y, does not result in a usable candidate\r\n\r\nIt didn't say the reinterpretation of `x \u003c y`, in this case, which is `(x \u003c=\u003e y) \u003c 0`, shall have a usable candidate or be well-formed.\r\n\r\n\r\n*** \r\n[over.match.general] p1 states that\r\n\u003e Overload resolution is a mechanism for selecting the best function to call **given a list of expressions that are to be the arguments** of the call and **a set of [candidate functions](https://eel.is/c++draft/over.match.general#def:candidate) that can be called based on the context of the call**[.](https://eel.is/c++draft/over.match.general#1.sentence-1)\r\n\r\nFor expression `x \u003c y`, the set of  candidate functions is `{  HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)  }` as per [over.match.oper] p3 and the list of arguments are `x, y` as per [over.match.oper] p7. Anyway, the overload resolution can succeed. ","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eAre you explaining why the comment in [class.compare.secondary] p3 is wrong? I believe it's right, extremely.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen the rewritten candidate is found, a nested overload resolution is performed for the written expression and then fails. According to \u003ca href=\"https://eel.is/c++draft/over.match.general#4\" rel=\"nofollow\"\u003e[over.match.general] p4\u003c/a\u003e, the rewritten candidate is not usable.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e\"the rewritten candidate is not usable\" No, it is usable. First, \u003ccode class=\"notranslate\"\u003eHasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)\u003c/code\u003e is a candidate for \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e, and all operands of the expression can be as the arguments in the call of \u003ccode class=\"notranslate\"\u003eHasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)\u003c/code\u003e since the operands are of type \u003ccode class=\"notranslate\"\u003econst C\u003c/code\u003e. According to [over.match.general] p2 and [over.match.general] p3, \u003ccode class=\"notranslate\"\u003eHasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)\u003c/code\u003e is the unique best viable function. Hence, the overload resolution succeeds.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ea nested overload resolution is performed for the written expression and then fails.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIMO, overload resolution only considers the candidate itself. It shouldn't consider subsequent interpretation for the expression. The clue is here:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf a rewritten operator\u0026lt;=\u0026gt; candidate is \u003cstrong\u003eselected by overload resolution\u003c/strong\u003e for an operator @, x @ y is interpreted as...\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThat is, only after the overload resolution for the expression \u003ccode class=\"notranslate\"\u003ex@y\u003c/code\u003e has succeeded and selected \u003ccode class=\"notranslate\"\u003erewritten operator\u0026lt;=\u0026gt; candidate\u003c/code\u003e will further interpretation be done. [class.compare.secondary] p2 just requires that\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eoverload resolution ([over.match]), as applied to x @ y, does not result in a usable candidate\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt didn't say the reinterpretation of \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e, in this case, which is \u003ccode class=\"notranslate\"\u003e(x \u0026lt;=\u0026gt; y) \u0026lt; 0\u003c/code\u003e, shall have a usable candidate or be well-formed.\u003c/p\u003e\n\u003chr\u003e\n\u003cp dir=\"auto\"\u003e[over.match.general] p1 states that\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOverload resolution is a mechanism for selecting the best function to call \u003cstrong\u003egiven a list of expressions that are to be the arguments\u003c/strong\u003e of the call and \u003cstrong\u003ea set of \u003ca href=\"https://eel.is/c++draft/over.match.general#def:candidate\" rel=\"nofollow\"\u003ecandidate functions\u003c/a\u003e that can be called based on the context of the call\u003c/strong\u003e\u003ca href=\"https://eel.is/c++draft/over.match.general#1.sentence-1\" rel=\"nofollow\"\u003e.\u003c/a\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eFor expression \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e, the set of  candidate functions is \u003ccode class=\"notranslate\"\u003e{  HasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)  }\u003c/code\u003e as per [over.match.oper] p3 and the list of arguments are \u003ccode class=\"notranslate\"\u003ex, y\u003c/code\u003e as per [over.match.oper] p7. Anyway, the overload resolution can succeed.\u003c/p\u003e","bodyVersion":"0ac49ecdccb1c98c68bfdb9a903612083be91cd26e9681be5167c975a785319b","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060250481","createdAt":"2022-03-07T06:57:03Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T07:28:17Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"UCE_lALOACHROc4_MiNxziFt6e0"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2MqyhgAqjEwNjAyNTA0ODE="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060276204,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"IC_kwDOACHROc4_Mofs","body":"If the comment is the intent of [class.compare.secondary] p2, it may be improved to  \r\n\r\n\u003e The operator function with parameters x and y is defined as deleted if\r\n\u003e\u003e - the candidate selected by overload resolution, as applied to `x @ y`, is not a rewritten candidate, or\r\n\u003e\u003e \u003e\u003e - For expression x @ y, it is ill-formed.\r\n\r\nthe candidate selected by overload resolution for `x \u003c y` is `HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026)`, which is a rewritten candidate, the first bullet is not violated. Since the selected candidate is `a rewritten operator\u003c=\u003e candidate`, the expression `x \u003c y` is interpreted as `(x \u003c=\u003e y) \u003c 0`, which is ill-formed; the first operand of `\u003c` has type `HasNoLessThan` while the second has the type `int`, they are not comparable.","bodyHTML":"\u003cp dir=\"auto\"\u003eIf the comment is the intent of [class.compare.secondary] p2, it may be improved to\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eThe operator function with parameters x and y is defined as deleted if\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ethe candidate selected by overload resolution, as applied to \u003ccode class=\"notranslate\"\u003ex @ y\u003c/code\u003e, is not a rewritten candidate, or\u003c/li\u003e\n\u003c/ul\u003e\n\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFor expression x @ y, it is ill-formed.\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/blockquote\u003e\n\u003c/blockquote\u003e\n\u003c/blockquote\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003ethe candidate selected by overload resolution for \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e is \u003ccode class=\"notranslate\"\u003eHasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;)\u003c/code\u003e, which is a rewritten candidate, the first bullet is not violated. Since the selected candidate is \u003ccode class=\"notranslate\"\u003ea rewritten operator\u0026lt;=\u0026gt; candidate\u003c/code\u003e, the expression \u003ccode class=\"notranslate\"\u003ex \u0026lt; y\u003c/code\u003e is interpreted as \u003ccode class=\"notranslate\"\u003e(x \u0026lt;=\u0026gt; y) \u0026lt; 0\u003c/code\u003e, which is ill-formed; the first operand of \u003ccode class=\"notranslate\"\u003e\u0026lt;\u003c/code\u003e has type \u003ccode class=\"notranslate\"\u003eHasNoLessThan\u003c/code\u003e while the second has the type \u003ccode class=\"notranslate\"\u003eint\u003c/code\u003e, they are not comparable.\u003c/p\u003e","bodyVersion":"43c4ed9ae62472f98da8a88c877a3c1581e041897378219b779a6f345a06ebfd","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060276204","createdAt":"2022-03-07T07:37:40Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T07:48:02Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"UCE_lALOACHROc4_MofsziFuArA"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2NP-aAAqjEwNjAyNzYyMDQ="},{"node":{"__typename":"CrossReferencedEvent","__isIssueTimelineItems":"CrossReferencedEvent","__isTimelineEvent":"CrossReferencedEvent","databaseId":1172026515,"createdAt":"2022-03-07T07:49:22Z","actor":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?s=64\u0026u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileResourcePath":"/xmh0511"},"source":{"__typename":"Issue","__isNode":"Issue","id":"I_kwDOACHROc5FMJRZ"},"willCloseTarget":false,"referencedAt":"2022-03-07T07:49:22Z","innerSource":{"__typename":"Issue","__isReferencedSubject":"Issue","id":"I_kwDOACHROc5FMJRZ","issueTitleHTML":"[class.compare.secondary] The extent to which \"The defaulted operator function is not considered\" applies CWG2546","url":"https://github.com/cplusplus/draft/issues/5335","number":5335,"stateReason":"COMPLETED","repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","isPrivate":false,"owner":{"__typename":"Organization","login":"cplusplus","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2"}},"__isNode":"Issue"},"__isNode":"CrossReferencedEvent","id":"CRE_kwDOACHROc5F27ST"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2Nar9ACqjExNzIwMjY1MTU="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060292507,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"IC_kwDOACHROc4_Mseb","body":"\u003e a nested overload resolution is performed for the written expression and then fails.\r\n\r\nAnother example that can prove we shouldn't augment the extent of considering overload resolution for this definition is:\r\n````cpp\r\nstruct HasNoLessThan { \r\n    operator int(){\r\n        return 0;\r\n    }\r\n};\r\nstruct C{\r\n    friend HasNoLessThan operator \u003c=\u003e(C const\u0026, C const\u0026);\r\n    bool operator \u003c(C const\u0026) const = default;\r\n};\r\nint main(){\r\n   using ptr = decltype(\u0026C::operator\u003c);\r\n}\r\n````\r\nBoth implementations accept this example. The nested overload resolution will be performed for the operator `\u003c` within `(x\u003c=\u003ey) \u003c 0`. The selected candidate is the built-in one, which would violate the second bullet in [class.compare.secondary] p2. It is not reasonable to augment the extent of the overload resolution. ","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ea nested overload resolution is performed for the written expression and then fails.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAnother example that can prove we shouldn't augment the extent of considering overload resolution for this definition is:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"struct HasNoLessThan { \n    operator int(){\n        return 0;\n    }\n};\nstruct C{\n    friend HasNoLessThan operator \u0026lt;=\u0026gt;(C const\u0026amp;, C const\u0026amp;);\n    bool operator \u0026lt;(C const\u0026amp;) const = default;\n};\nint main(){\n   using ptr = decltype(\u0026amp;C::operator\u0026lt;);\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eHasNoLessThan\u003c/span\u003e { \n    \u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eint\u003c/span\u003e(){\n        \u003cspan class=\"pl-k\"\u003ereturn\u003c/span\u003e \u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e;\n    }\n};\n\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eC\u003c/span\u003e{\n    \u003cspan class=\"pl-k\"\u003efriend\u003c/span\u003e HasNoLessThan \u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e \u0026lt;=\u0026gt;(C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;, C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;);\n    \u003cspan class=\"pl-k\"\u003ebool\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e \u0026lt;(C \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e\u0026amp;) \u003cspan class=\"pl-k\"\u003econst\u003c/span\u003e = \u003cspan class=\"pl-k\"\u003edefault\u003c/span\u003e;\n};\n\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emain\u003c/span\u003e(){\n   \u003cspan class=\"pl-k\"\u003eusing\u003c/span\u003e ptr = \u003cspan class=\"pl-c1\"\u003edecltype\u003c/span\u003e(\u0026amp;C::\u003cspan class=\"pl-k\"\u003eoperator\u003c/span\u003e\u0026lt;);\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eBoth implementations accept this example. The nested overload resolution will be performed for the operator \u003ccode class=\"notranslate\"\u003e\u0026lt;\u003c/code\u003e within \u003ccode class=\"notranslate\"\u003e(x\u0026lt;=\u0026gt;y) \u0026lt; 0\u003c/code\u003e. The selected candidate is the built-in one, which would violate the second bullet in [class.compare.secondary] p2. It is not reasonable to augment the extent of the overload resolution.\u003c/p\u003e","bodyVersion":"7f6a01a61638508a11aa0d1ce54b216dff6a3f625b0a413a15f7ee27b446c1ad","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060292507","createdAt":"2022-03-07T08:03:46Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T08:05:02Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"UCE_lALOACHROc4_MsebziFuGUI"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2Nn3tAAqjEwNjAyOTI1MDc="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":1060999020,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"IC_kwDOACHROc4_PY9s","body":"The \"selected candidate\" in [class.compare.secondary] p2 is `operator \u003c=\u003e`, not the second-order overload resolution for `operator\u003c`.\r\n\r\nThe fixes in CWG2546 should address this, too.","bodyHTML":"\u003cp dir=\"auto\"\u003eThe \"selected candidate\" in [class.compare.secondary] p2 is \u003ccode class=\"notranslate\"\u003eoperator \u0026lt;=\u0026gt;\u003c/code\u003e, not the second-order overload resolution for \u003ccode class=\"notranslate\"\u003eoperator\u0026lt;\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe fixes in \u003ca class=\"issue-link js-issue-link notranslate\" rel=\"noopener noreferrer nofollow\" href=\"https://cplusplus.github.io/CWG/issues/2546.html\"\u003eCWG2546\u003c/a\u003e should address this, too.\u003c/p\u003e","bodyVersion":"6acf119471bb57b76e3805c75e4e4d11bed3dbf5e3f46710b4f5951f271ca13e","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/5336#issuecomment-1060999020","createdAt":"2022-03-07T18:30:40Z","authorAssociation":"MEMBER","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":"2022-03-07T18:30:48Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/jensmaurer","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"UCE_lALOACHROc4_PY9sziFy9PM"},"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":2,"nodes":[{"__typename":"User","login":"xmh0511","__isNode":"User","id":"MDQ6VXNlcjE3OTczODkx"},{"__typename":"User","login":"frederick-vs-ja","__isNode":"User","id":"MDQ6VXNlcjIzMjI4OTg5"}]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2Wl0IAAqjEwNjA5OTkwMjA="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":6197101798,"createdAt":"2022-03-07T18:30:58Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"label":{"id":"MDU6TGFiZWw1NzcwMDEwNQ==","nameHTML":"cwg","name":"cwg","color":"bfd4f2","description":"Issue must be reviewed by CWG."},"__isNode":"LabeledEvent","id":"LE_lADOACHROc5FMT9TzwAAAAFxYETm"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2WmFtABqjYxOTcxMDE3OTg="},{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":6197103554,"createdAt":"2022-03-07T18:31:15Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"currentTitle":"[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function CWG2546","previousTitle":"[class.compare.default] p1 The condition of implicitly defining a defaulted comparison operator function","__isNode":"RenamedTitleEvent","id":"RTE_lADOACHROc5FMT9TzwAAAAFxYEvC"},"cursor":"Y3Vyc29yOnYyOpPPAAABf2WmWTgBqjYxOTcxMDM1NTQ="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":2081315671,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"I_kwDOACHROc5FMT9T","number":5336,"locked":false,"databaseId":1160855379},"author":{"__typename":"User","login":"frederick-vs-ja","avatarUrl":"https://avatars.githubusercontent.com/u/23228989?v=4","profileUrl":"https://github.com/frederick-vs-ja","id":"MDQ6VXNlcjIzMjI4OTg5"},"id":"IC_kwDOACHROc58DltX","body":"Should have been fixed by #6906 (eef4c2ba0d3952605e6ab839705f769690b92f7e).","bodyHTML":"\u003cp dir=\"auto\"\u003eShould have been fixed by \u003ca class=\"issue-link js-issue-link\" data-error-text=\"Failed to load title\" data-id=\"2210257561\" data-permission-text=\"Title is private\" data-url=\"https://github.com/cplusplus/draft/issues/6906\" data-hovercard-type=\"pull_request\" data-hovercard-url=\"/cplusplus/draft/pull/6906/hovercard\" href=\"https://github.com/cplusplus/draft/pull/6906\"\u003e#6906\u003c/a\u003e (\u003ca class=\"commit-link\" data-hovercard-type=\"commit\" data-hovercard-url=\"https://github.com/cplusplus/draft/commit/eef4c2ba0d3952605e6ab839705f769690b92f7e/hovercard\" 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2022</relative-time></a></div></div><div class="ActivityHeader-module__narrowViewportWrapper--k4ncm IssueBodyHeader-module__actionsWrapper--nZngh"><div class="ActivityHeader-module__edits--WkfqY IssueBodyHeader-module__editsSection--ptNnu"></div><div class="IssueBodyHeader-module__badgesSection--izNBK"><div class="IssueBodyHeader-module__badgeGroup--xiI1A"></div><div class="IssueBodyHeader-module__actionsSection--CZDiB"><button data-component="IconButton" type="button" aria-haspopup="true" aria-expanded="false" tabindex="0" class="prc-Button-ButtonBase-c50BI prc-Button-IconButton-szpyj" data-loading="false" data-no-visuals="true" data-size="small" data-variant="invisible" aria-describedby=":R4ldklmb:-loading-announcement" aria-labelledby=":R3sldklmb:" id=":R4ldklmb:"><svg aria-hidden="true" focusable="false" class="octicon octicon-kebab-horizontal" viewBox="0 0 16 16" width="16" height="16" fill="currentColor" display="inline-block" overflow="visible" style="vertical-align:text-bottom"><path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path></svg></button><span class="prc-TooltipV2-Tooltip-cYMVY" data-direction="s" aria-hidden="true" id=":R3sldklmb:">Issue body actions</span></div></div></div></div></div><div class="IssueBodyViewer-module__IssueBody--Zg6Wy" id="issue-body-viewer" data-testid="issue-body-viewer"><div data-testid="markdown-body" data-team-hovercards-enabled="true" class="markdown-body" data-turbolinks="false"><div class="Box-sc-g0xbh4-0 markdown-body NewMarkdownViewer-module__safe-html-box--dKCgP"><p dir="auto">[class.compare.default] p1 just says</p>
<blockquote>
<p dir="auto">A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is <a href="https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined" rel="nofollow">implicitly defined</a> when it is <strong>odr-used</strong> or <strong>needed for constant evaluation</strong><a href="https://eel.is/c++draft/class.compare#default-1.sentence-2" rel="nofollow">.</a></p>
</blockquote>
<p dir="auto">Consider this example</p>
<div class="highlight highlight-source-c++ notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="struct HasNoLessThan { };
struct C{
    friend HasNoLessThan operator &lt;=&gt;(C const&amp;, C const&amp;);
    bool operator &lt;(C const&amp;) const /*noexcept*/ = default;
};
int main(){
   using ptr = decltype(&amp;C::operator&lt;); // #1
}"><pre class="notranslate"><span class="pl-k">struct</span> <span class="pl-en">HasNoLessThan</span> { };
<span class="pl-k">struct</span> <span class="pl-en">C</span>{
    <span class="pl-k">friend</span> HasNoLessThan <span class="pl-k">operator</span> &lt;=&gt;(C <span class="pl-k">const</span>&amp;, C <span class="pl-k">const</span>&amp;);
    <span class="pl-k">bool</span> <span class="pl-k">operator</span> &lt;(C <span class="pl-k">const</span>&amp;) <span class="pl-k">const</span> <span class="pl-c"><span class="pl-c">/*</span>noexcept<span class="pl-c">*/</span></span> = <span class="pl-k">default</span>;
};
<span class="pl-k">int</span> <span class="pl-en">main</span>(){
   <span class="pl-k">using</span> ptr = <span class="pl-c1">decltype</span>(&amp;C::<span class="pl-k">operator</span>&lt;); <span class="pl-c"><span class="pl-c">//</span> #1</span>
}</pre></div>
<p dir="auto">Since <code class="notranslate">&amp;C::operator&lt;</code> appears as an unevaluated operand, function <code class="notranslate">C::operator &lt;</code> is not odr-used by this expression. However, Clang reports a diagnosis that:</p>
<blockquote>
<p dir="auto">in evaluation of exception specification for 'C::operator&lt;' needed here</p>
</blockquote>
<p dir="auto">[except.spec] p11 says</p>
<blockquote>
<p dir="auto">The exception specification for a comparison operator function ([over.binary]) without a noexcept-specifier that is defaulted on its first declaration is potentially-throwing if and only if <strong>any expression in the implicit definition is potentially-throwing</strong>.</p>
</blockquote>
<p dir="auto">So, It is reasonable to check the definition of the defaulted function. However, we just define two contexts that can cause the implicit definition for the defaulted function. Checking the expressions in the implicit definition is not defined to be odr-used nor constant evaluation of the function. It seems that we lack the case that determines the exception specification of a defaulted comparison operator function.</p>
<p dir="auto">Improvement:</p>
<blockquote>
<p dir="auto">A comparison operator function for class C that is defaulted on its first declaration and is not defined as deleted is <a href="https://eel.is/c++draft/class.compare#def:operator,comparison,implicitly_defined" rel="nofollow">implicitly defined</a> when it is odr-used, needed for constant evaluation, or needed to determine exception specification(if necessary)<a href="https://eel.is/c++draft/class.compare#default-1.sentence-2" rel="nofollow">.</a></p>
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LoadingSkeleton-sc-14d3f1fe-0 hpcToU WHXBA"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU dsfQtU"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gLGucC"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU dusaQG"></div></div></div></div></div></div><div><div class="CommentLoading-module__CommentLoadingContainer--I9JkW"><div height="40px" width="40px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 kqdiwS gALJmv"></div><div class="CommentLoading-module__CommentLoadingContentWrapper--Qd0Vg"><div class="CommentDivider-module__CommentDividerContainer--fCCZA"><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerLeftLine--TwR8y"></div><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerRightLine--_guT1"></div></div><div data-testid="comment-skeleton" class="CommentLoading-module__CommentLoadingCard--QQ_c8"><div class="CommentLoading-module__CommentLoadingHeader--_JjPE"><div height="sm" width="150px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 jKxfJf gpOnMk"></div></div><div class="CommentLoading-module__CommentLoadingContent--QWS3r"><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gVWXUh"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU cdjIRs"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU iUqXOB"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gdffFr"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU iUqXOB"></div></div></div></div></div></div><div><div class="CommentLoading-module__CommentLoadingContainer--I9JkW"><div height="40px" width="40px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 kqdiwS gALJmv"></div><div class="CommentLoading-module__CommentLoadingContentWrapper--Qd0Vg"><div class="CommentDivider-module__CommentDividerContainer--fCCZA"><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerLeftLine--TwR8y"></div><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerRightLine--_guT1"></div></div><div data-testid="comment-skeleton" class="CommentLoading-module__CommentLoadingCard--QQ_c8"><div class="CommentLoading-module__CommentLoadingHeader--_JjPE"><div height="sm" width="150px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 jKxfJf gpOnMk"></div></div><div class="CommentLoading-module__CommentLoadingContent--QWS3r"><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jPvaA-d"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jPvaA-d"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU fzmedS"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jETYlX"></div></div></div></div></div></div><div><div class="CommentLoading-module__CommentLoadingContainer--I9JkW"><div height="40px" width="40px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 kqdiwS gALJmv"></div><div class="CommentLoading-module__CommentLoadingContentWrapper--Qd0Vg"><div class="CommentDivider-module__CommentDividerContainer--fCCZA"><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerLeftLine--TwR8y"></div><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerRightLine--_guT1"></div></div><div data-testid="comment-skeleton" class="CommentLoading-module__CommentLoadingCard--QQ_c8"><div class="CommentLoading-module__CommentLoadingHeader--_JjPE"><div height="sm" width="150px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 jKxfJf gpOnMk"></div></div><div class="CommentLoading-module__CommentLoadingContent--QWS3r"><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gKzppR"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jETYlX"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU iUqXOB"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gyTeWh"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jtwpHH"></div></div></div></div></div></div></div><!--/$--></div></div></div><div data-testid="issue-viewer-metadata-container" class="Box-sc-g0xbh4-0 cLtwuV IssueViewer-module__metadataSidebar--QdJ2b"><div class="IssueViewer-module__issueViewerMetadataPane--i01ta" data-testid="issue-viewer-metadata-pane"><h2 class="IssueViewer-module__metadataHeader--OGi4i prc-Heading-Heading-6CmGO">Metadata</h2><h2 class="IssueViewer-module__largeScreenMetadataHeader--xPLHt sr-only prc-Heading-Heading-6CmGO">Metadata</h2><div data-testid="sticky-sidebar"><div class="IssueSidebar-module__sidebarContent--II51T"><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Assignees</h3></div><span class="Section-module__emptyText--qZ0Bc">No one assigned</span><div class="Section-module__hiddenChildrenContainer--X126P"><ul class="prc-ActionList-ActionList-X4RiC Assignees-module__assigneesList--JFnuE" data-dividers="false" data-variant="full"></ul></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Labels</h3></div></div><div class="Section-module__childrenContainer--bY_oH"><div tabindex="-1" data-testid="issue-labels" class="Box-sc-g0xbh4-0 LabelsList-module__labelsListContainer--bS7BO"><a class="LabelsList-module__labelLink--hHZBM prc-Link-Link-85e08" data-muted="true" href="https://github.com/cplusplus/draft/issues?q=state%3Aopen%20label%3A%22cwg%22" muted="" aria-describedby="MDU6TGFiZWw1NzcwMDEwNQ==-tooltip :R65pmb:"><span style="overflow:hidden;text-overflow:ellipsis;cursor:pointer;max-width:100%" class="TokenBase__StyledTokenBase-sc-9bb35eca-0 pjUne"><span class="TokenTextContainer-sc-eef9053-0 ljslTk"><span class="prc-Text-Text-0ima0">cwg</span></span></span><span class="sr-only" id="MDU6TGFiZWw1NzcwMDEwNQ==-tooltip">Issue must be reviewed by CWG.</span></a><span class="Box-sc-g0xbh4-0 etxWHV LabelsList-module__labelDescriptionTooltip--LvHc0 prc-TooltipV2-Tooltip-cYMVY" data-direction="s" aria-label="Issue must be reviewed by CWG." role="tooltip" aria-hidden="true" id=":R65pmb:">Issue must be reviewed by CWG.</span></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Type</h3></div><span class="Section-module__emptyText--qZ0Bc">No type</span><div class="Section-module__hiddenChildrenContainer--X126P"><div class="TypesSection-module__typeContainer--YI5mY"><div class="IssueType-module__hiddenPlaceholder--nnfV9"></div></div></div></div></div><!--$--><div data-testid="sidebar-projects-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 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data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Relationships</h3></div><span class="Section-module__emptyText--qZ0Bc">None yet</span><div class="Section-module__hiddenChildrenContainer--X126P"></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Development</h3></div><span class="Section-module__emptyText--qZ0Bc">No branches or pull requests</span><div class="Section-module__hiddenChildrenContainer--X126P"></div></div></div><!--/$--><h2 class="sr-only 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<li class="mx-2">
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    <button
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      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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  <div id="ajax-error-message" class="ajax-error-message flash flash-error" hidden>
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      <div class="octocat-spinner my-6 js-details-dialog-spinner"></div>
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</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 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">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</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">
      <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">
    <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">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
    </clipboard-copy>
  </div>
</template>




    </div>
    <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div>
    <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div>
  </body>
</html>

