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  <title>Template parameter pack that does not participate in template argument deduction · Issue #4555 · cplusplus/draft · GitHub</title>



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    <script type="application/ld+json">{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Template parameter pack that does not participate in template argument deduction","articleBody":"According to [temp.deduct.call]\r\n\u003e Template argument deduction is done by comparing each function template parameter type (call it P) that **contains template-parameters** that participate in template argument deduction with the type of the corresponding argument of the call (call it A) as described below.\r\n\r\n\u003e In most cases, the types, templates, and non-type values that are used to **compose P** participate in template argument deduction.   \r\n\r\nIn this example  \r\n````cpp\r\ntemplate\u003cclass...T, class U\u003e\r\nvoid fun(U);\r\nint main(){\r\n   fun(0);  //#1\r\n}\r\n````\r\nAs per the above rule, the template parameter pack does not participate in template argument deduction. If there were no other special rule specified, as per \r\n\u003e  if any template argument remains neither **deduced** nor explicitly specified, **template argument deduction fails**.  \r\n\r\nThe deduction would fail since the template argument for the template parameter pack is neither deduced(the pack does not participate in the deduction process) nor explicitly specified.  \r\n\r\nHowever, in the older standard, there's a special rule states that:  \r\n\u003e A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.  \r\n\r\nHowever, such a normative rule has become a [note](https://eel.is/c++draft/temp.arg.explicit#note-1) in the current draft. I think such a rule should be a normative rule since there's no other alternative rule that states similar things.  Making it to be a note is not persuasive to explain why can `#1` be otherwise deduced successfully.","author":{"url":"https://github.com/xmh0511","@type":"Person","name":"xmh0511"},"datePublished":"2021-03-23T12:40:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/4555/draft/issues/4555"}</script> 
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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>

                  </ul>
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            </div>
        </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">
      <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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</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="wH67_dMZnUjW5-GUuaa5qq-jzl0SNs8kG-802K7Y1xaEf69xpxSj3NuqOycOrtCeKwf5qGNs5gCxNcaLU9OZ3Q" 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-48e5d38f-7410-48a2-8307-347a31ab15fb" 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="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">
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                  class="ActionListWrap QueryBuilder-ListWrap"
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                name="custom_scope_name"
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                required
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          <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"
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              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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                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/4555&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="cc0ee5768a05155adc1fa4522e82ad1fce6dd3faec7d16564663e8908eea0a8e"
                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/4555&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="cc0ee5768a05155adc1fa4522e82ad1fce6dd3faec7d16564663e8908eea0a8e"
                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-7c733313-7678-4773-b2dc-03d5e74e167c" aria-labelledby="tooltip-f82a3eea-7f63-4b84-afb4-86c9c64d3268" 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-f82a3eea-7f63-4b84-afb4-86c9c64d3268" for="icon-button-7c733313-7678-4773-b2dc-03d5e74e167c" 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-c0672a85-901b-40fa-8d88-946e2250b7b4" aria-labelledby="tooltip-7622dadd-9a4b-4b26-b277-ff186dbcf1ae" 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-7622dadd-9a4b-4b26-b277-ff186dbcf1ae" for="icon-button-c0672a85-901b-40fa-8d88-946e2250b7b4" 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/4555&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="8ce410192a089a9c7f167c36af7ce3cf7d144335b6c08ebe9303d67fea7e53c0" 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-6d8f8633-2742-446f-b025-778dc2bc0dc6" 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/4555&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="e104a73b25ea8899aa32b170187cd1db6aa67eb2893d456fcfe7edfb0cdc31b9" 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/4555&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="1efc01997079cabcc29e5e6d78b201935190017581f3692980c35c985250c553" 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">
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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":"Template parameter pack that does not participate in template argument deduction","articleBody":"According to [temp.deduct.call]\r\n\u003e Template argument deduction is done by comparing each function template parameter type (call it P) that **contains template-parameters** that participate in template argument deduction with the type of the corresponding argument of the call (call it A) as described below.\r\n\r\n\u003e In most cases, the types, templates, and non-type values that are used to **compose P** participate in template argument deduction.   \r\n\r\nIn this example  \r\n````cpp\r\ntemplate\u003cclass...T, class U\u003e\r\nvoid fun(U);\r\nint main(){\r\n   fun(0);  //#1\r\n}\r\n````\r\nAs per the above rule, the template parameter pack does not participate in template argument deduction. If there were no other special rule specified, as per \r\n\u003e  if any template argument remains neither **deduced** nor explicitly specified, **template argument deduction fails**.  \r\n\r\nThe deduction would fail since the template argument for the template parameter pack is neither deduced(the pack does not participate in the deduction process) nor explicitly specified.  \r\n\r\nHowever, in the older standard, there's a special rule states that:  \r\n\u003e A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.  \r\n\r\nHowever, such a normative rule has become a [note](https://eel.is/c++draft/temp.arg.explicit#note-1) in the current draft. I think such a rule should be a normative rule since there's no other alternative rule that states similar things.  Making it to be a note is not persuasive to explain why can `#1` be otherwise deduced successfully.","author":{"url":"https://github.com/xmh0511","@type":"Person","name":"xmh0511"},"datePublished":"2021-03-23T12:40:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/4555/draft/issues/4555"},"preloadedQueries":[{"queryId":"cee21fcf82c877ad153a2db35b36eb94","queryName":"IssueViewerViewQuery","variables":{"count":15,"id":"repository","number":4555,"owner":"cplusplus","repo":"draft"},"result":{"data":{"repository":{"isOwnerEnterpriseManaged":false,"issue":{"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","updatedAt":"2021-03-25T02:15:48Z","title":"Template parameter pack that does not participate in template argument deduction","number":4555,"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":"Template parameter pack that does not participate in template argument deduction","url":"https://github.com/cplusplus/draft/issues/4555","viewerCanUpdateNext":false,"issueType":null,"state":"OPEN","stateReason":null,"duplicateOf":null,"linkedPullRequests":{"nodes":[]},"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"},{"node":{"id":"MDU6TGFiZWw4NzA3NzYxOTM=","color":"4bd8cf","name":"not-editorial","nameHTML":"not-editorial","description":"Issue is not deemed editorial; the editorial issue is kept open for tracking.","url":"https://github.com/cplusplus/draft/labels/not-editorial","__typename":"Label"},"cursor":"Mg"}],"pageInfo":{"endCursor":"Mg","hasNextPage":false}},"__isNode":"Issue","assignedActors":{"nodes":[]},"milestone":null,"databaseId":838684728,"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":"According to [temp.deduct.call]\r\n\u003e Template argument deduction is done by comparing each function template parameter type (call it P) that **contains template-parameters** that participate in template argument deduction with the type of the corresponding argument of the call (call it A) as described below.\r\n\r\n\u003e In most cases, the types, templates, and non-type values that are used to **compose P** participate in template argument deduction.   \r\n\r\nIn this example  \r\n````cpp\r\ntemplate\u003cclass...T, class U\u003e\r\nvoid fun(U);\r\nint main(){\r\n   fun(0);  //#1\r\n}\r\n````\r\nAs per the above rule, the template parameter pack does not participate in template argument deduction. If there were no other special rule specified, as per \r\n\u003e  if any template argument remains neither **deduced** nor explicitly specified, **template argument deduction fails**.  \r\n\r\nThe deduction would fail since the template argument for the template parameter pack is neither deduced(the pack does not participate in the deduction process) nor explicitly specified.  \r\n\r\nHowever, in the older standard, there's a special rule states that:  \r\n\u003e A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.  \r\n\r\nHowever, such a normative rule has become a [note](https://eel.is/c++draft/temp.arg.explicit#note-1) in the current draft. I think such a rule should be a normative rule since there's no other alternative rule that states similar things.  Making it to be a note is not persuasive to explain why can `#1` be otherwise deduced successfully.","bodyHTML":"\u003cp dir=\"auto\"\u003eAccording to [temp.deduct.call]\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eTemplate argument deduction is done by comparing each function template parameter type (call it P) that \u003cstrong\u003econtains template-parameters\u003c/strong\u003e that participate in template argument deduction with the type of the corresponding argument of the call (call it A) as described below.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIn most cases, the types, templates, and non-type values that are used to \u003cstrong\u003ecompose P\u003c/strong\u003e participate in template argument deduction.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIn this example\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"template\u0026lt;class...T, class U\u0026gt;\nvoid fun(U);\nint main(){\n   fun(0);  //#1\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003etemplate\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e...T, \u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eU\u003c/span\u003e\u0026gt;\n\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efun\u003c/span\u003e(U);\n\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emain\u003c/span\u003e(){\n   \u003cspan class=\"pl-c1\"\u003efun\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e);  \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\"\u003eAs per the above rule, the template parameter pack does not participate in template argument deduction. If there were no other special rule specified, as per\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eif any template argument remains neither \u003cstrong\u003ededuced\u003c/strong\u003e nor explicitly specified, \u003cstrong\u003etemplate argument deduction fails\u003c/strong\u003e.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe deduction would fail since the template argument for the template parameter pack is neither deduced(the pack does not participate in the deduction process) nor explicitly specified.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, in the older standard, there's a special rule states that:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eHowever, such a normative rule has become a \u003ca href=\"https://eel.is/c++draft/temp.arg.explicit#note-1\" rel=\"nofollow\"\u003enote\u003c/a\u003e in the current draft. I think such a rule should be a normative rule since there's no other alternative rule that states similar things.  Making it to be a note is not persuasive to explain why can \u003ccode class=\"notranslate\"\u003e#1\u003c/code\u003e be otherwise deduced successfully.\u003c/p\u003e","bodyVersion":"d5dfd611e182b8882eb55549113026813e1e0d07e298d81a4dd74c8945e22331","createdAt":"2021-03-23T12:40:31Z","__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":"Y3Vyc29yOnYyOpPPAAABgY9mMMACqjExOTU0Njk4MTA="},"totalCount":11,"edges":[{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":805053445,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","number":4555,"locked":false,"databaseId":838684728},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDgwNTA1MzQ0NQ==","body":"None of the rules you quoted say anything about when a template parameter does or does not participate in template argument deduction, so I'm not seeing your point. (I believe the T pack does participate in template argument deduction here.) Note [temp.deduct.type] p4\r\n\r\n\u003e In certain contexts, however, the value does not participate in type deduction, but instead uses the values of template arguments that were either deduced elsewhere or explicitly specified.\r\n\r\n(Nothing is explicitly specified and this is not a non-deducible context.)","bodyHTML":"\u003cp dir=\"auto\"\u003eNone of the rules you quoted say anything about when a template parameter does or does not participate in template argument deduction, so I'm not seeing your point. (I believe the T pack does participate in template argument deduction here.) Note [temp.deduct.type] p4\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIn certain contexts, however, the value does not participate in type deduction, but instead uses the values of template arguments that were either deduced elsewhere or explicitly specified.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e(Nothing is explicitly specified and this is not a non-deducible context.)\u003c/p\u003e","bodyVersion":"cca625bcebf8e0f4887b91e90938f6e6e923be36583a5aa688c1a29e329d0155","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4555#issuecomment-805053445","createdAt":"2021-03-23T16:38:59Z","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":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":"Y3Vyc29yOnYyOpPPAAABeF_0JLgAqTgwNTA1MzQ0NQ=="},{"node":{"__typename":"ClosedEvent","__isIssueTimelineItems":"ClosedEvent","__isTimelineEvent":"ClosedEvent","databaseId":4497318812,"createdAt":"2021-03-23T16:39:14Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"stateReason":"COMPLETED","duplicateOf":null,"closingProjectItemStatus":null,"closer":null,"__isNode":"ClosedEvent","id":"MDExOkNsb3NlZEV2ZW50NDQ5NzMxODgxMg=="},"cursor":"Y3Vyc29yOnYyOpPPAAABeF_0X1ABqjQ0OTczMTg4MTI="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":805406233,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","number":4555,"locked":false,"databaseId":838684728},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDgwNTQwNjIzMw==","body":"\u003e None of the rules you quoted say anything about when a template parameter does or does not participate in template argument deduction, so I'm not seeing your point. (I believe the T pack does participate in template argument deduction here.) Note [temp.deduct.type] p4\r\n\u003e \r\n\u003e \u003e In certain contexts, however, the value does not participate in type deduction, but instead uses the values of template arguments that were either deduced elsewhere or explicitly specified.\r\n\u003e \r\n\u003e (Nothing is explicitly specified and this is not a non-deducible context.)\r\n\r\nI think the quote you cited here might apply to such a case: \r\n````cpp\r\ntemplate\u003cclass T\u003e\r\nT fun(T);\r\n````\r\nIn a function call, `T` in the return type does not participate in template argument deduction, however the second `T` in function parameter does. Hence it's the case of `deduced elsewhere`.  \r\n\r\nIn the first snippet, pack `T` does not appear in function parameters which will be used to determine the value of template arguments  in a context of deduction for function call. I think if there's no certain rule rules that \"template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments\", how to deduced the pack to a empty of template arguments?","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eNone of the rules you quoted say anything about when a template parameter does or does not participate in template argument deduction, so I'm not seeing your point. (I believe the T pack does participate in template argument deduction here.) Note [temp.deduct.type] p4\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIn certain contexts, however, the value does not participate in type deduction, but instead uses the values of template arguments that were either deduced elsewhere or explicitly specified.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003e(Nothing is explicitly specified and this is not a non-deducible context.)\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI think the quote you cited here might apply to such a case:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"template\u0026lt;class T\u0026gt;\nT fun(T);\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003etemplate\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eT\u003c/span\u003e\u0026gt;\nT \u003cspan class=\"pl-en\"\u003efun\u003c/span\u003e(T);\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn a function call, \u003ccode class=\"notranslate\"\u003eT\u003c/code\u003e in the return type does not participate in template argument deduction, however the second \u003ccode class=\"notranslate\"\u003eT\u003c/code\u003e in function parameter does. Hence it's the case of \u003ccode class=\"notranslate\"\u003ededuced elsewhere\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn the first snippet, pack \u003ccode class=\"notranslate\"\u003eT\u003c/code\u003e does not appear in function parameters which will be used to determine the value of template arguments  in a context of deduction for function call. I think if there's no certain rule rules that \"template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments\", how to deduced the pack to a empty of template arguments?\u003c/p\u003e","bodyVersion":"7bb8e8d0a3f2d880ab20130d7b4920d025848d85d652aa57d7ed7a04bd7f2d33","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4555#issuecomment-805406233","createdAt":"2021-03-24T01:40:05Z","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":"2021-03-24T01:41:09Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDQ1NTY1Mjk3"},"__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":"Y3Vyc29yOnYyOpPPAAABeGHjiQgAqTgwNTQwNjIzMw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":805995849,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","number":4555,"locked":false,"databaseId":838684728},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDgwNTk5NTg0OQ==","body":"So, the point you're making is that the T pack doesn't appear in the function parameters, so template argument deduction can't possibly deduce it. Which means we need wording elsewhere to say what T is in the example above.\r\n\r\nThe text\r\n\r\n\u003e A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.\r\n\r\nwas made a note in P1787R6.\r\n\r\nAsked CWG http://lists.isocpp.org/core/2021/03/10688.php","bodyHTML":"\u003cp dir=\"auto\"\u003eSo, the point you're making is that the T pack doesn't appear in the function parameters, so template argument deduction can't possibly deduce it. Which means we need wording elsewhere to say what T is in the example above.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe text\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003ewas made a note in P1787R6.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAsked CWG \u003ca href=\"http://lists.isocpp.org/core/2021/03/10688.php\" rel=\"nofollow\"\u003ehttp://lists.isocpp.org/core/2021/03/10688.php\u003c/a\u003e\u003c/p\u003e","bodyVersion":"563c5f49eaf5f86a1016706b59497185d05bc75873ef9e9f6bdc91f1950c4997","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4555#issuecomment-805995849","createdAt":"2021-03-24T16:59:11Z","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":"2021-03-24T17:00:24Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/jensmaurer","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDQ1ODA4NTA5"},"__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":"Y3Vyc29yOnYyOpPPAAABeGUs_xgAqTgwNTk5NTg0OQ=="},{"node":{"__typename":"ReopenedEvent","__isIssueTimelineItems":"ReopenedEvent","__isTimelineEvent":"ReopenedEvent","databaseId":4503180147,"createdAt":"2021-03-24T16:59:15Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"__isNode":"ReopenedEvent","id":"MDEzOlJlb3BlbmVkRXZlbnQ0NTAzMTgwMTQ3"},"cursor":"Y3Vyc29yOnYyOpPPAAABeGUtDrgBqjQ1MDMxODAxNDc="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":4504961650,"createdAt":"2021-03-24T23:30:22Z","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":"MDEyOkxhYmVsZWRFdmVudDQ1MDQ5NjE2NTA="},"cursor":"Y3Vyc29yOnYyOpPPAAABeGaTIrABqjQ1MDQ5NjE2NTA="},{"node":{"__typename":"LabeledEvent","__isIssueTimelineItems":"LabeledEvent","__isTimelineEvent":"LabeledEvent","databaseId":4504961651,"createdAt":"2021-03-24T23:30:22Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"label":{"id":"MDU6TGFiZWw4NzA3NzYxOTM=","nameHTML":"not-editorial","name":"not-editorial","color":"4bd8cf","description":"Issue is not deemed editorial; the editorial issue is kept open for tracking."},"__isNode":"LabeledEvent","id":"MDEyOkxhYmVsZWRFdmVudDQ1MDQ5NjE2NTE="},"cursor":"Y3Vyc29yOnYyOpPPAAABeGaTIrABqjQ1MDQ5NjE2NTE="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":806249571,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","number":4555,"locked":false,"databaseId":838684728},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDgwNjI0OTU3MQ==","body":"This seems to be an issue in the wording, but it feels far from editorial.","bodyHTML":"\u003cp dir=\"auto\"\u003eThis seems to be an issue in the wording, but it feels far from editorial.\u003c/p\u003e","bodyVersion":"9dc4d008a42d95c8264751c1aeaa2f1075154339a2c9a985b72b6b0140d47de4","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4555#issuecomment-806249571","createdAt":"2021-03-24T23:30:46Z","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":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":"Y3Vyc29yOnYyOpPPAAABeGaTgHAAqTgwNjI0OTU3MQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":806309823,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU4Mzg2ODQ3Mjg=","number":4555,"locked":false,"databaseId":838684728},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDgwNjMwOTgyMw==","body":"\u003e So, the point you're making is that the T pack doesn't appear in the function parameters, so template argument deduction can't possibly deduce it. Which means we need wording elsewhere to say what T is in the example above.\r\n\u003e \r\n\u003e The text\r\n\u003e \r\n\u003e \u003e A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.\r\n\u003e \r\n\u003e was made a note in P1787R6.\r\n\u003e \r\n\u003e Asked CWG http://lists.isocpp.org/core/2021/03/10688.php\r\n\r\nYes, That's exactly what I'm concerning here. Moreover, it seems such a case can only apply to those packs that do not parcipate in deduction.  \r\n````cpp\r\ntemplate\u003cclass...T\u003e\r\nstruct Tuple{\r\n  Tuple(int);\r\n};\r\ntemplate\u003cclass...T\u003e\r\nvoid fun(Tuple\u003cT...\u003e);\r\nint main(){\r\n   fun(0);  //invalid\r\n}\r\n````\r\nSince it violates [temp.deduct.call#4]","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eSo, the point you're making is that the T pack doesn't appear in the function parameters, so template argument deduction can't possibly deduce it. Which means we need wording elsewhere to say what T is in the example above.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe text\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eA trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003ewas made a note in P1787R6.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAsked CWG \u003ca href=\"http://lists.isocpp.org/core/2021/03/10688.php\" rel=\"nofollow\"\u003ehttp://lists.isocpp.org/core/2021/03/10688.php\u003c/a\u003e\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes, That's exactly what I'm concerning here. Moreover, it seems such a case can only apply to those packs that do not parcipate in deduction.\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"template\u0026lt;class...T\u0026gt;\nstruct Tuple{\n  Tuple(int);\n};\ntemplate\u0026lt;class...T\u0026gt;\nvoid fun(Tuple\u0026lt;T...\u0026gt;);\nint main(){\n   fun(0);  //invalid\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003etemplate\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e...T\u0026gt;\n\u003cspan class=\"pl-k\"\u003estruct\u003c/span\u003e \u003cspan class=\"pl-en\"\u003eTuple\u003c/span\u003e{\n  \u003cspan class=\"pl-en\"\u003eTuple\u003c/span\u003e(\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e);\n};\n\u003cspan class=\"pl-k\"\u003etemplate\u003c/span\u003e\u0026lt;\u003cspan class=\"pl-k\"\u003eclass\u003c/span\u003e...T\u0026gt;\n\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efun\u003c/span\u003e(Tuple\u0026lt;T...\u0026gt;);\n\u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e \u003cspan class=\"pl-en\"\u003emain\u003c/span\u003e(){\n   \u003cspan class=\"pl-c1\"\u003efun\u003c/span\u003e(\u003cspan class=\"pl-c1\"\u003e0\u003c/span\u003e);  \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003einvalid\u003c/span\u003e\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSince it violates [temp.deduct.call#4]\u003c/p\u003e","bodyVersion":"5a1ef4121a9416960d9da7a680f6095fcfd7433eb38c38224a9e01cf355d3963","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4555#issuecomment-806309823","createdAt":"2021-03-25T02:15:21Z","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":"2021-03-25T02:15:48Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDQ1OTYxNzMz"},"__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":"Y3Vyc29yOnYyOpPPAAABeGcqLqgAqTgwNjMwOTgyMw=="},{"node":{"__typename":"CrossReferencedEvent","__isIssueTimelineItems":"CrossReferencedEvent","__isTimelineEvent":"CrossReferencedEvent","databaseId":1173818269,"createdAt":"2022-03-15T15:38:07Z","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_kwDOACHROc5Ful9l"},"willCloseTarget":false,"referencedAt":"2022-03-15T15:38:06Z","innerSource":{"__typename":"Issue","__isReferencedSubject":"Issue","id":"I_kwDOACHROc5Ful9l","issueTitleHTML":"[temp.deduct.type] 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HeaderViewer-module__VerifiedHTMLBox--_DgIv" data-testid="issue-title">Template parameter pack that does not participate in template argument deduction</bdi> <span class="HeaderViewer-module__issueNumberText--ofQHQ">#4555</span></h1></div><div class="prc-PageHeader-ContextArea-6ykSJ" data-hidden-regular="true"><div class="prc-PageHeader-ContextAreaActions-RTJRk HeaderViewer-module__PageHeader_ContextAreaActions--zjX2m" data-hidden-regular="true"><div class="HeaderMenu-module__menuActionsContainer--Gf9W9"><div class="Box-sc-g0xbh4-0 kIppVx HeaderMenu-module__buttonContainer--Nazjm"><a type="button" href="/login?return_to=" target="_blank" class="prc-Button-ButtonBase-c50BI" data-loading="false" data-no-visuals="true" data-size="medium" data-variant="primary" aria-describedby=":Ria56b:-loading-announcement"><span data-component="buttonContent" data-align="center" class="prc-Button-ButtonContent-HKbr-"><span data-component="text" class="prc-Button-Label-pTQ3x">New 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data-testid="issue-body-header-link"><relative-time class="sc-aXZVg IssueBodyHeader-module__RelativeTime--LRd7n">on <!-- -->Mar 23, 2021</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">According to [temp.deduct.call]</p>
<blockquote>
<p dir="auto">Template argument deduction is done by comparing each function template parameter type (call it P) that <strong>contains template-parameters</strong> that participate in template argument deduction with the type of the corresponding argument of the call (call it A) as described below.</p>
</blockquote>
<blockquote>
<p dir="auto">In most cases, the types, templates, and non-type values that are used to <strong>compose P</strong> participate in template argument deduction.</p>
</blockquote>
<p dir="auto">In this example</p>
<div class="highlight highlight-source-c++ notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="template&lt;class...T, class U&gt;
void fun(U);
int main(){
   fun(0);  //#1
}"><pre class="notranslate"><span class="pl-k">template</span>&lt;<span class="pl-k">class</span>...T, <span class="pl-k">class</span> <span class="pl-en">U</span>&gt;
<span class="pl-k">void</span> <span class="pl-en">fun</span>(U);
<span class="pl-k">int</span> <span class="pl-en">main</span>(){
   <span class="pl-c1">fun</span>(<span class="pl-c1">0</span>);  <span class="pl-c"><span class="pl-c">//</span>#1</span>
}</pre></div>
<p dir="auto">As per the above rule, the template parameter pack does not participate in template argument deduction. If there were no other special rule specified, as per</p>
<blockquote>
<p dir="auto">if any template argument remains neither <strong>deduced</strong> nor explicitly specified, <strong>template argument deduction fails</strong>.</p>
</blockquote>
<p dir="auto">The deduction would fail since the template argument for the template parameter pack is neither deduced(the pack does not participate in the deduction process) nor explicitly specified.</p>
<p dir="auto">However, in the older standard, there's a special rule states that:</p>
<blockquote>
<p dir="auto">A trailing template parameter pack ([temp.variadic]) not otherwise deduced will be deduced as an empty sequence of template arguments.</p>
</blockquote>
<p dir="auto">However, such a normative rule has become a <a href="https://eel.is/c++draft/temp.arg.explicit#note-1" rel="nofollow">note</a> in the current draft. I think such a rule should be a normative rule since there's no other alternative rule that states similar things.  Making it to be a note is not persuasive to explain why can <code class="notranslate">#1</code> be otherwise deduced successfully.</p></div></div><div class="IssueBodyViewer-module__IssueBodyTaskList--xb3uu"><!--$--><div role="toolbar" aria-label="Reactions" class="d-flex gap-1 flex-wrap"></div><!--/$--></div></div></div></div></div></div></div><div data-testid="issue-viewer-comments-container" class="react-comments-container"><div class="IssueViewer-module__commentsContainer--H8wxg"><!--$!--><template></template><div class="issue-timeline-loading-module__delaySkeletonLoad--OE2Lq" data-testid="issue-timeline-loading"><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 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LoadingSkeleton-sc-14d3f1fe-0 hpcToU jtwpHH"></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 enjTfw"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU dplTPO"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU dsfQtU"></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 giHZOD"></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 jfXiil"></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 dRlina"></div></div></div></div></div></div></div><!--/$--></div></div></div><div data-testid="issue-viewer-metadata-container" class="Box-sc-g0xbh4-0 cLtwuV 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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><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%22not-editorial%22" muted="" aria-describedby="MDU6TGFiZWw4NzA3NzYxOTM=-tooltip :Ra5pmb:"><span style="overflow:hidden;text-overflow:ellipsis;cursor:pointer;max-width:100%" class="TokenBase__StyledTokenBase-sc-9bb35eca-0 kwrpnj"><span class="TokenTextContainer-sc-eef9053-0 ljslTk"><span class="prc-Text-Text-0ima0">not-editorial</span></span></span><span class="sr-only" id="MDU6TGFiZWw4NzA3NzYxOTM=-tooltip">Issue is not deemed editorial; the editorial issue is kept open for tracking.</span></a><span class="Box-sc-g0xbh4-0 etxWHV LabelsList-module__labelDescriptionTooltip--LvHc0 prc-TooltipV2-Tooltip-cYMVY" data-direction="s" aria-label="Issue is not deemed editorial; the editorial issue is kept open for tracking." role="tooltip" aria-hidden="true" id=":Ra5pmb:">Issue is not deemed editorial; the editorial issue is kept open for tracking.</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 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prc-Heading-Heading-6CmGO">Milestone</h3></div><span class="Section-module__emptyText--qZ0Bc">No milestone</span><div class="Section-module__hiddenChildrenContainer--X126P"><ul class="prc-ActionList-ActionList-X4RiC" data-dividers="false" data-variant="full"><div class="Milestone-module__hiddenPlaceholder--b_yit"></div></ul></div></div></div><!--$--><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Relationships</h3></div><span class="Section-module__emptyText--qZ0Bc">None yet</span><div class="Section-module__hiddenChildrenContainer--X126P"></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Development</h3></div><span class="Section-module__emptyText--qZ0Bc">No branches or pull requests</span><div class="Section-module__hiddenChildrenContainer--X126P"></div></div></div><!--/$--><h2 class="sr-only prc-Heading-Heading-6CmGO">Issue actions</h2><ul class="prc-ActionList-ActionList-X4RiC OptionsSection-module__ActionListOverrides--DkWge" data-dividers="false" data-variant="full"></ul></div></div></div></div></div></div><!--/$--></div><!--/$--></div></div><!--/$--><!--/$--><script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div>
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          <footer class="footer pt-8 pb-6 f6 color-fg-muted p-responsive" role="contentinfo" >
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    <button
      type="button"
      class="Link--secondary underline-on-hover border-0 p-0 color-bg-transparent"
      data-action="click:cookie-consent-link#showConsentManagement"
      data-analytics-event="{&quot;location&quot;:&quot;footer&quot;,&quot;action&quot;:&quot;cookies&quot;,&quot;context&quot;:&quot;subfooter&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;cookies_link_subfooter_footer&quot;}"
    >
       Manage cookies
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  </cookie-consent-link>
</li>

<li class="mx-2">
  <cookie-consent-link>
    <button
      type="button"
      class="Link--secondary underline-on-hover border-0 p-0 color-bg-transparent text-left"
      data-action="click:cookie-consent-link#showConsentManagement"
      data-analytics-event="{&quot;location&quot;:&quot;footer&quot;,&quot;action&quot;:&quot;dont_share_info&quot;,&quot;context&quot;:&quot;subfooter&quot;,&quot;tag&quot;:&quot;link&quot;,&quot;label&quot;:&quot;dont_share_info_link_subfooter_footer&quot;}"
    >
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    <ghcc-consent id="ghcc" class="position-fixed bottom-0 left-0" style="z-index: 999999"
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    ></ghcc-consent>




  <div id="ajax-error-message" class="ajax-error-message flash flash-error" hidden>
    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert">
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</svg>
    <button type="button" class="flash-close js-ajax-error-dismiss" aria-label="Dismiss error">
      <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
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    You can’t perform that action at this time.
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    <template id="site-details-dialog">
  <details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open>
    <summary role="button" aria-label="Close dialog"></summary>
    <details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
      <button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
        <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 class="octocat-spinner my-6 js-details-dialog-spinner"></div>
    </details-dialog>
  </details>
</template>

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

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

