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  <title>[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression? · Issue #4619 · cplusplus/draft · GitHub</title>



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    <script type="application/ld+json">{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression?","articleBody":"\u003e [expr.prim.lambda#capture-15] When the lambda-expression is evaluated, the entities that are captured by copy are used to direct-initialize each corresponding non-static data member of the resulting closure object, and the non-static data members corresponding to the init-captures are initialized as indicated by the corresponding initializer (which may be copy- or direct-initialization). (For array members, the array elements are direct-initialized in increasing subscript order.) These initializations are performed in the (unspecified) order in which the non-static data members are declared.  \r\n\r\nIt is underspecified about which entity the id-expression **captured by reference**  refers to when the lambda-expression is evaluated.  For instance:  \r\n````cpp\r\nvoid fun(){\r\n  int a;\r\n auto f = [\u0026a](){\r\n    a = 1; //#3\r\n };\r\n}\r\nint main(){\r\n  fun(); //#1\r\n  fun(); //#2\r\n}\r\n````\r\nIn major implementations, each invocation of the function `fun` will make that the id-expression  `a` at `#3` denotes the different object.  In other words, the evaluation of the prvalue lambda-expression will initialize its result object which is `f`, however, the standard does not specify what object the id-expression `a` will refer to in every result function object `f`.    \r\n\r\nThe rule  for an entity that is captured by reference  is defined as the following:   \r\n\u003e [expr.prim.lambda#capture-12] An entity is captured by reference if it is implicitly or explicitly captured but not captured by copy. It is unspecified whether additional unnamed non-static data members are declared in the closure type for entities captured by reference. If declared, such non-static data members shall be of literal type.\r\n\r\nIt does not explicitly specify the `otherwise` case that there's no additional unnamed non-static data member to be declared. So, we may unclear know what entity the id-expression refers to when the lambda-expression is evaluated, where the id-expression is captured by reference. As far as I know, the following rule does not apply to the above example as well.   \r\n\u003e [expr.prim.lambda#capture-13] An id-expression within the compound-statement of a lambda-expression that is an odr-use of a **reference** captured by reference refers to the entity to which the captured reference is bound and not to the captured reference.   \r\n\r\nSince in the simple-capture `\u0026a` where `a` is not a reference. Instead, it's an object.   \r\n\r\nIn addition, even though the unnamed non-static data member is declared for such capture(captured by reference), I think the following rule is still not suitable for that case \r\n\u003e [expr.prim.lambda#capture-11] Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity **captured by copy** is transformed into an access to the corresponding unnamed data member of the closure type.  \r\n\r\nAlso, [expr.prim.lambda#capture-15] does not specify how the initialization would be for the unnamed non-static data member declared for the case captured by reference. \r\n\r\nGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\r\n","author":{"url":"https://github.com/xmh0511","@type":"Person","name":"xmh0511"},"datePublished":"2021-05-31T12:07:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/4619/draft/issues/4619"}</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">
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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="hECkw2R7W-6XhWZoVPe8lK_pGMAsw6ytTmrF949ljDC61vDpgk3CjkFfV3cp0D-8b7anAYC5furUQNDPtUqHhg" 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-0baab18c-df36-46ff-b6a2-fe375ec5a8c1" data-target="query-builder.input" data-action="
          input:query-builder#inputChange
          blur:query-builder#inputBlur
          keydown:query-builder#inputKeydown
          focus:query-builder#inputFocus
        " data-view-component="true" class="FormControl-input QueryBuilder-Input FormControl-medium" />
          </div>
        </div>
          <span class="sr-only" id="query-builder-test-clear">Clear</span>
          <button role="button" id="query-builder-test-clear-button" aria-labelledby="query-builder-test-clear query-builder-test-label" data-target="query-builder.clearButton" data-action="
                click:query-builder#clear
                focus:query-builder#clearButtonFocus
                blur:query-builder#clearButtonBlur
              " variant="small" hidden="hidden" type="button" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium mr-1 px-2 py-0 d-flex flex-items-center rounded-1 color-fg-muted">  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x-circle-fill Button-visual">
    <path d="M2.343 13.657A8 8 0 1 1 13.658 2.343 8 8 0 0 1 2.343 13.657ZM6.03 4.97a.751.751 0 0 0-1.042.018.751.751 0 0 0-.018 1.042L6.94 8 4.97 9.97a.749.749 0 0 0 .326 1.275.749.749 0 0 0 .734-.215L8 9.06l1.97 1.97a.749.749 0 0 0 1.275-.326.749.749 0 0 0-.215-.734L9.06 8l1.97-1.97a.749.749 0 0 0-.326-1.275.749.749 0 0 0-.734.215L8 6.94Z"></path>
</svg>
</button>

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

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

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

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

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

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

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

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

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

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

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

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

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

<template id="copilot-error-icon">
  <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copilot-error">
    <path d="M16 11.24c0 .112-.072.274-.21.467L13 9.688V7.862l-.023-.116c-.49.21-1.075.291-1.727.291-.198 0-.388-.009-.571-.029L6.833 5.226a4.01 4.01 0 0 0 .17-.782c.117-.935-.037-1.395-.241-1.614-.193-.206-.637-.413-1.682-.297-.683.076-1.115.231-1.395.415l-1.257-.91c.579-.564 1.413-.877 2.485-.996 1.206-.134 2.262.034 2.944.765.05.053.096.108.139.165.044-.057.094-.112.143-.165.682-.731 1.738-.899 2.944-.765 1.23.137 2.145.528 2.724 1.261.566.715.693 1.614.693 2.484 0 .572-.053 1.148-.254 1.656.066.228.098.429.126.612.012.076.024.148.037.218.924.385 1.522 1.471 1.591 2.095Zm-5.083-8.707c-1.044-.116-1.488.091-1.681.297-.204.219-.359.679-.242 1.614.091.726.303 1.231.618 1.553.299.305.784.54 1.638.54.922 0 1.28-.198 1.442-.379.179-.2.308-.578.308-1.371 0-.765-.123-1.242-.37-1.554-.233-.296-.693-.587-1.713-.7Zm2.511 11.074c-1.393.776-3.272 1.428-5.43 1.428-4.562 0-7.873-2.914-7.998-3.749V9.338c.085-.628.677-1.686 1.588-2.065.013-.07.024-.143.036-.218.029-.183.06-.384.126-.612-.18-.455-.241-.963-.252-1.475L.31 4.107A.747.747 0 0 1 0 3.509V3.49a.748.748 0 0 1 .625-.73c.156-.026.306.047.435.139l14.667 10.578a.592.592 0 0 1 .227.264.752.752 0 0 1 .046.249v.022a.75.75 0 0 1-1.19.596Zm-1.367-.991L5.635 7.964a5.128 5.128 0 0 1-.889.073c-.652 0-1.236-.081-1.727-.291l-.023.116v4.255c.419.323 2.722 1.433 5.002 1.433 1.539 0 3.089-.505 4.063-.934Z"></path>
</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="play-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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              <input type="hidden" data-csrf="true" value="IEqLk8N//EEzUJuWCkh+o8mKDqjUcedphd//WNVaxOO0YpLve4ew0nse06xxf5VufpLHQ3DTvr+yEZWl0CXq7A==" />
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            <label for="custom_scope_query">Query</label>
            <input
              type="text"
              name="custom_scope_query"
              id="custom_scope_query"
              data-target="custom-scopes.customScopesQueryField"
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              placeholder="(repo:mona/a OR repo:mona/b) AND lang:python"
              required
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            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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                style="margin-left: 12px;"
                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/4619&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="7eae3c7ce0c4809202ff76cae76c9bad59c54e8a1a0d5edf4472b55350095ba0"
                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/4619&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="7eae3c7ce0c4809202ff76cae76c9bad59c54e8a1a0d5edf4472b55350095ba0"
                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-6e6485e7-9ad4-4870-99b4-e943941ac58f" aria-labelledby="tooltip-54280a9c-7704-456d-824d-d6bae182f104" 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-54280a9c-7704-456d-824d-d6bae182f104" for="icon-button-6e6485e7-9ad4-4870-99b4-e943941ac58f" 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-d0df7aec-a044-4762-8e8e-04c7339109e9" aria-labelledby="tooltip-6f67dd55-7f21-474b-a9bf-33e7602a728e" 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-6f67dd55-7f21-474b-a9bf-33e7602a728e" for="icon-button-d0df7aec-a044-4762-8e8e-04c7339109e9" 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/4619&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="df07e9882231c952d6c3d66bc51f13ddf26be5cc68bcde3edc5e47a93ed245e5" 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-05b99af4-88a2-4c67-a849-d4438f4e30cd" 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/4619&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="3daf673c87208bac57179734b01a8dbd88d756f2eb118dbeee518b864d22dd4a" 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/4619&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="f5d5c60ae58c29d8964c6f337fc1810ea3c65468dec5e4c6d0671ea0ed2141a1" aria-label="You must be signed in to star a repository" data-view-component="true" class="tooltipped tooltipped-sw btn-sm btn">    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-star v-align-text-bottom d-inline-block mr-2">
    <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path>
</svg><span data-view-component="true" class="d-inline">
          Star
</span>          <span id="repo-stars-counter-star" aria-label="5938 users starred this repository" data-singular-suffix="user starred this repository" data-plural-suffix="users starred this repository" data-turbo-replace="true" title="5,938" data-view-component="true" class="Counter js-social-count">5.9k</span>
</a></div>
  </li>

</ul>

        </div>
      </div>

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


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

  <ul data-view-component="true" class="UnderlineNav-body list-style-none">
      <li data-view-component="true" class="d-inline-flex">
  <a id="code-tab" href="/cplusplus/draft" data-tab-item="i0code-tab" data-selected-links="repo_source repo_downloads repo_commits repo_releases repo_tags repo_branches repo_packages repo_deployments repo_attestations /cplusplus/draft" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g c" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Code&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-code UnderlineNav-octicon d-none d-sm-inline">
    <path d="m11.28 3.22 4.25 4.25a.75.75 0 0 1 0 1.06l-4.25 4.25a.749.749 0 0 1-1.275-.326.749.749 0 0 1 .215-.734L13.94 8l-3.72-3.72a.749.749 0 0 1 .326-1.275.749.749 0 0 1 .734.215Zm-6.56 0a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042L2.06 8l3.72 3.72a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L.47 8.53a.75.75 0 0 1 0-1.06Z"></path>
</svg>
        <span data-content="Code">Code</span>
          <span id="code-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="Not available" data-view-component="true" class="Counter"></span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="issues-tab" href="/cplusplus/draft/issues" data-tab-item="i1issues-tab" data-selected-links="repo_issues repo_labels repo_milestones /cplusplus/draft/issues" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g i" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Issues&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" aria-current="page" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item selected">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-issue-opened UnderlineNav-octicon d-none d-sm-inline">
    <path d="M8 9.5a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path><path d="M8 0a8 8 0 1 1 0 16A8 8 0 0 1 8 0ZM1.5 8a6.5 6.5 0 1 0 13 0 6.5 6.5 0 0 0-13 0Z"></path>
</svg>
        <span data-content="Issues">Issues</span>
          <span id="issues-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="685" data-view-component="true" class="Counter">685</span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="pull-requests-tab" href="/cplusplus/draft/pulls" data-tab-item="i2pull-requests-tab" data-selected-links="repo_pulls checks /cplusplus/draft/pulls" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g p" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Pull requests&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-git-pull-request UnderlineNav-octicon d-none d-sm-inline">
    <path d="M1.5 3.25a2.25 2.25 0 1 1 3 2.122v5.256a2.251 2.251 0 1 1-1.5 0V5.372A2.25 2.25 0 0 1 1.5 3.25Zm5.677-.177L9.573.677A.25.25 0 0 1 10 .854V2.5h1A2.5 2.5 0 0 1 13.5 5v5.628a2.251 2.251 0 1 1-1.5 0V5a1 1 0 0 0-1-1h-1v1.646a.25.25 0 0 1-.427.177L7.177 3.427a.25.25 0 0 1 0-.354ZM3.75 2.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm0 9.5a.75.75 0 1 0 0 1.5.75.75 0 0 0 0-1.5Zm8.25.75a.75.75 0 1 0 1.5 0 .75.75 0 0 0-1.5 0Z"></path>
</svg>
        <span data-content="Pull requests">Pull requests</span>
          <span id="pull-requests-repo-tab-count" data-pjax-replace="" data-turbo-replace="" title="298" data-view-component="true" class="Counter">298</span>


    
</a></li>
      <li data-view-component="true" class="d-inline-flex">
  <a id="actions-tab" href="/cplusplus/draft/actions" data-tab-item="i3actions-tab" data-selected-links="repo_actions /cplusplus/draft/actions" data-pjax="#repo-content-pjax-container" data-turbo-frame="repo-content-turbo-frame" data-hotkey="g a" data-analytics-event="{&quot;category&quot;:&quot;Underline navbar&quot;,&quot;action&quot;:&quot;Click tab&quot;,&quot;label&quot;:&quot;Actions&quot;,&quot;target&quot;:&quot;UNDERLINE_NAV.TAB&quot;}" data-view-component="true" class="UnderlineNav-item no-wrap js-responsive-underlinenav-item js-selected-navigation-item">
    
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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":"[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression?","articleBody":"\u003e [expr.prim.lambda#capture-15] When the lambda-expression is evaluated, the entities that are captured by copy are used to direct-initialize each corresponding non-static data member of the resulting closure object, and the non-static data members corresponding to the init-captures are initialized as indicated by the corresponding initializer (which may be copy- or direct-initialization). (For array members, the array elements are direct-initialized in increasing subscript order.) These initializations are performed in the (unspecified) order in which the non-static data members are declared.  \r\n\r\nIt is underspecified about which entity the id-expression **captured by reference**  refers to when the lambda-expression is evaluated.  For instance:  \r\n````cpp\r\nvoid fun(){\r\n  int a;\r\n auto f = [\u0026a](){\r\n    a = 1; //#3\r\n };\r\n}\r\nint main(){\r\n  fun(); //#1\r\n  fun(); //#2\r\n}\r\n````\r\nIn major implementations, each invocation of the function `fun` will make that the id-expression  `a` at `#3` denotes the different object.  In other words, the evaluation of the prvalue lambda-expression will initialize its result object which is `f`, however, the standard does not specify what object the id-expression `a` will refer to in every result function object `f`.    \r\n\r\nThe rule  for an entity that is captured by reference  is defined as the following:   \r\n\u003e [expr.prim.lambda#capture-12] An entity is captured by reference if it is implicitly or explicitly captured but not captured by copy. It is unspecified whether additional unnamed non-static data members are declared in the closure type for entities captured by reference. If declared, such non-static data members shall be of literal type.\r\n\r\nIt does not explicitly specify the `otherwise` case that there's no additional unnamed non-static data member to be declared. So, we may unclear know what entity the id-expression refers to when the lambda-expression is evaluated, where the id-expression is captured by reference. As far as I know, the following rule does not apply to the above example as well.   \r\n\u003e [expr.prim.lambda#capture-13] An id-expression within the compound-statement of a lambda-expression that is an odr-use of a **reference** captured by reference refers to the entity to which the captured reference is bound and not to the captured reference.   \r\n\r\nSince in the simple-capture `\u0026a` where `a` is not a reference. Instead, it's an object.   \r\n\r\nIn addition, even though the unnamed non-static data member is declared for such capture(captured by reference), I think the following rule is still not suitable for that case \r\n\u003e [expr.prim.lambda#capture-11] Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity **captured by copy** is transformed into an access to the corresponding unnamed data member of the closure type.  \r\n\r\nAlso, [expr.prim.lambda#capture-15] does not specify how the initialization would be for the unnamed non-static data member declared for the case captured by reference. \r\n\r\nGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\r\n","author":{"url":"https://github.com/xmh0511","@type":"Person","name":"xmh0511"},"datePublished":"2021-05-31T12:07:36.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":11},"url":"https://github.com/4619/draft/issues/4619"},"preloadedQueries":[{"queryId":"cee21fcf82c877ad153a2db35b36eb94","queryName":"IssueViewerViewQuery","variables":{"count":15,"id":"repository","number":4619,"owner":"cplusplus","repo":"draft"},"result":{"data":{"repository":{"isOwnerEnterpriseManaged":false,"issue":{"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","updatedAt":"2021-06-03T07:32:48Z","title":"[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression?","number":4619,"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":"[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression?","url":"https://github.com/cplusplus/draft/issues/4619","viewerCanUpdateNext":false,"issueType":null,"state":"OPEN","stateReason":null,"duplicateOf":null,"linkedPullRequests":{"nodes":[]},"subIssuesSummary":{"total":0,"completed":0},"__isLabelable":"Issue","labels":{"edges":[],"pageInfo":{"endCursor":null,"hasNextPage":false}},"__isNode":"Issue","assignedActors":{"nodes":[]},"milestone":null,"databaseId":907410974,"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":"\u003e [expr.prim.lambda#capture-15] When the lambda-expression is evaluated, the entities that are captured by copy are used to direct-initialize each corresponding non-static data member of the resulting closure object, and the non-static data members corresponding to the init-captures are initialized as indicated by the corresponding initializer (which may be copy- or direct-initialization). (For array members, the array elements are direct-initialized in increasing subscript order.) These initializations are performed in the (unspecified) order in which the non-static data members are declared.  \r\n\r\nIt is underspecified about which entity the id-expression **captured by reference**  refers to when the lambda-expression is evaluated.  For instance:  \r\n````cpp\r\nvoid fun(){\r\n  int a;\r\n auto f = [\u0026a](){\r\n    a = 1; //#3\r\n };\r\n}\r\nint main(){\r\n  fun(); //#1\r\n  fun(); //#2\r\n}\r\n````\r\nIn major implementations, each invocation of the function `fun` will make that the id-expression  `a` at `#3` denotes the different object.  In other words, the evaluation of the prvalue lambda-expression will initialize its result object which is `f`, however, the standard does not specify what object the id-expression `a` will refer to in every result function object `f`.    \r\n\r\nThe rule  for an entity that is captured by reference  is defined as the following:   \r\n\u003e [expr.prim.lambda#capture-12] An entity is captured by reference if it is implicitly or explicitly captured but not captured by copy. It is unspecified whether additional unnamed non-static data members are declared in the closure type for entities captured by reference. If declared, such non-static data members shall be of literal type.\r\n\r\nIt does not explicitly specify the `otherwise` case that there's no additional unnamed non-static data member to be declared. So, we may unclear know what entity the id-expression refers to when the lambda-expression is evaluated, where the id-expression is captured by reference. As far as I know, the following rule does not apply to the above example as well.   \r\n\u003e [expr.prim.lambda#capture-13] An id-expression within the compound-statement of a lambda-expression that is an odr-use of a **reference** captured by reference refers to the entity to which the captured reference is bound and not to the captured reference.   \r\n\r\nSince in the simple-capture `\u0026a` where `a` is not a reference. Instead, it's an object.   \r\n\r\nIn addition, even though the unnamed non-static data member is declared for such capture(captured by reference), I think the following rule is still not suitable for that case \r\n\u003e [expr.prim.lambda#capture-11] Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity **captured by copy** is transformed into an access to the corresponding unnamed data member of the closure type.  \r\n\r\nAlso, [expr.prim.lambda#capture-15] does not specify how the initialization would be for the unnamed non-static data member declared for the case captured by reference. \r\n\r\nGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\r\n","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e[expr.prim.lambda#capture-15] When the lambda-expression is evaluated, the entities that are captured by copy are used to direct-initialize each corresponding non-static data member of the resulting closure object, and the non-static data members corresponding to the init-captures are initialized as indicated by the corresponding initializer (which may be copy- or direct-initialization). (For array members, the array elements are direct-initialized in increasing subscript order.) These initializations are performed in the (unspecified) order in which the non-static data members are declared.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt is underspecified about which entity the id-expression \u003cstrong\u003ecaptured by reference\u003c/strong\u003e  refers to when the lambda-expression is evaluated.  For instance:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"void fun(){\n  int a;\n auto f = [\u0026amp;a](){\n    a = 1; //#3\n };\n}\nint main(){\n  fun(); //#1\n  fun(); //#2\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efun\u003c/span\u003e(){\n  \u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e a;\n \u003cspan class=\"pl-k\"\u003eauto\u003c/span\u003e f = [\u0026amp;a](){\n    a = \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e; \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e#3\u003c/span\u003e\n };\n}\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-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e#1\u003c/span\u003e\n  \u003cspan class=\"pl-c1\"\u003efun\u003c/span\u003e(); \u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e//\u003c/span\u003e#2\u003c/span\u003e\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn major implementations, each invocation of the function \u003ccode class=\"notranslate\"\u003efun\u003c/code\u003e will make that the id-expression  \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e at \u003ccode class=\"notranslate\"\u003e#3\u003c/code\u003e denotes the different object.  In other words, the evaluation of the prvalue lambda-expression will initialize its result object which is \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e, however, the standard does not specify what object the id-expression \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e will refer to in every result function object \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe rule  for an entity that is captured by reference  is defined as the following:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e[expr.prim.lambda#capture-12] An entity is captured by reference if it is implicitly or explicitly captured but not captured by copy. It is unspecified whether additional unnamed non-static data members are declared in the closure type for entities captured by reference. If declared, such non-static data members shall be of literal type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt does not explicitly specify the \u003ccode class=\"notranslate\"\u003eotherwise\u003c/code\u003e case that there's no additional unnamed non-static data member to be declared. So, we may unclear know what entity the id-expression refers to when the lambda-expression is evaluated, where the id-expression is captured by reference. As far as I know, the following rule does not apply to the above example as well.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e[expr.prim.lambda#capture-13] An id-expression within the compound-statement of a lambda-expression that is an odr-use of a \u003cstrong\u003ereference\u003c/strong\u003e captured by reference refers to the entity to which the captured reference is bound and not to the captured reference.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSince in the simple-capture \u003ccode class=\"notranslate\"\u003e\u0026amp;a\u003c/code\u003e where \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e is not a reference. Instead, it's an object.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn addition, even though the unnamed non-static data member is declared for such capture(captured by reference), I think the following rule is still not suitable for that case\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e[expr.prim.lambda#capture-11] Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity \u003cstrong\u003ecaptured by copy\u003c/strong\u003e is transformed into an access to the corresponding unnamed data member of the closure type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eAlso, [expr.prim.lambda#capture-15] does not specify how the initialization would be for the unnamed non-static data member declared for the case captured by reference.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\u003c/p\u003e","bodyVersion":"9d8d9078fb69e8385fcdee9277f8f20544dd14846e0be10dbab68ec6b68544fe","createdAt":"2021-05-31T12:07:36Z","__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":"Y3Vyc29yOnYyOpPPAAABedDJ-QABqjQ4MzU4NTc3NTM="},"totalCount":14,"edges":[{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":4820324116,"createdAt":"2021-05-31T12:07:56Z","actor":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?s=64\u0026u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileResourcePath":"/xmh0511"},"currentTitle":"The description for which entity the id-expression captured by reference refers to after evaluating the lambda-expression","previousTitle":"The description for which entity the id-expression captured by reference refers to after evaluting the lambda-expression","__isNode":"RenamedTitleEvent","id":"MDE3OlJlbmFtZWRUaXRsZUV2ZW50NDgyMDMyNDExNg=="},"cursor":"Y3Vyc29yOnYyOpPPAAABecJSyWABqjQ4MjAzMjQxMTY="},{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":4822500582,"createdAt":"2021-06-01T01:34:05Z","actor":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?s=64\u0026u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileResourcePath":"/xmh0511"},"currentTitle":"The description for which entity does the id-expression captured by reference refer to after evaluating the lambda-expression","previousTitle":"The description for which entity the id-expression captured by reference refers to after evaluating the lambda-expression","__isNode":"RenamedTitleEvent","id":"MDE3OlJlbmFtZWRUaXRsZUV2ZW50NDgyMjUwMDU4Mg=="},"cursor":"Y3Vyc29yOnYyOpPPAAABecU01sgBqjQ4MjI1MDA1ODI="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851747714,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"languagelawyer","avatarUrl":"https://avatars.githubusercontent.com/u/38548419?v=4","profileUrl":"https://github.com/languagelawyer","id":"MDQ6VXNlcjM4NTQ4NDE5"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTc0NzcxNA==","body":"\u003e ... the standard does not specify what object the id-expression `a` will refer to in every result function object `f`.\r\n\r\nYou mean that the context in which variable `a` is mapped to the object is not  tied to the closure object? I don't think this issue is solvable without variable/object divorce. There is just no adequate language to speak about this.\r\n\r\n\u003e expr.prim.lambda#capture-12 ... It does not explicitly specify the otherwise case that there's no additional unnamed non-static data member to be declared.\r\n\r\nWhere do you want to put the «otherwise» part?\r\n\r\n\u003e Generally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\r\n\r\nWhy the presence of the corresponding NSDM is relevant when such id-expression is never transformed to member access?","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e... the standard does not specify what object the id-expression \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e will refer to in every result function object \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYou mean that the context in which variable \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e is mapped to the object is not  tied to the closure object? I don't think this issue is solvable without variable/object divorce. There is just no adequate language to speak about this.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eexpr.prim.lambda#capture-12 ... It does not explicitly specify the otherwise case that there's no additional unnamed non-static data member to be declared.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhere do you want to put the «otherwise» part?\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhy the presence of the corresponding NSDM is relevant when such id-expression is never transformed to member access?\u003c/p\u003e","bodyVersion":"1a343340e59ed28cd68ac823c391c37377c1f447c2858f8f3d1ddb2b29081c89","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851747714","createdAt":"2021-06-01T01:47:07Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABecVAxXgAqTg1MTc0NzcxNA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851751089,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTc1MTA4OQ==","body":"\u003e \u003e ... the standard does not specify what object the id-expression `a` will refer to in every result function object `f`.\r\n\u003e \r\n\u003e You mean that the context in which variable `a` is mapped to the object is not tied to the closure object? I don't think this issue is solvable without variable/object divorce. There is just no adequate language to speak about this.\r\n\u003e \r\nSince the wording is lack for the case of the reference capture when the prvalue(lambda-expression) is evaluated, it should clearly specify what the id-expression will denote(captured by reference) . [expr.prim.lambda#capture-15] totally talks about the case of **captured by copy**, regardless of simple-capture or init-capture\r\n\r\n\u003e \u003e expr.prim.lambda#capture-12 ... It does not explicitly specify the otherwise case that there's no additional unnamed non-static data member to be declared.\r\n\u003e \r\n\u003e Where do you want to put the «otherwise» part? \r\n\u003e   \r\nMaybe `otherwise part` would clarify what entity the id-expression denotes in the compound-statement of the lambda-expression(or in the function body of the call operator of the **result object**), after all, in this case, there's no unnamed NSDN. Such as: \r\n\u003e  Otherwise, the id-expression in the compound-statement denotes the entity named by the id-expression when the lambda-expression is evaluated. \r\n\r\nIt could tie the entity named by the id-expression to the id-expression that appears in the call operator function's body of the result object of the lambda-expression.\r\n\r\n\u003e \u003e Generally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\r\n\u003e \r\n\u003e Why the presence of the corresponding NSDM is relevant when such id-expression is never transformed to member access? \r\n\r\nSince [expr.prim.lambda#capture-12] says \r\n\u003e  If declared, such non-static data members shall be of literal type. \r\n\r\nThe implementation can adopt the suggestion to declare an NSDM for this purpose as long as the member is of literal type. So, in this case, the standard should clarify how the member will be initialized when the lambda-expression is evaluated and how the id-expression in the function body will be transformed.\r\n\r\n\r\n\r\n","bodyHTML":"\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003e... the standard does not specify what object the id-expression \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e will refer to in every result function object \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYou mean that the context in which variable \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e is mapped to the object is not tied to the closure object? I don't think this issue is solvable without variable/object divorce. There is just no adequate language to speak about this.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSince the wording is lack for the case of the reference capture when the prvalue(lambda-expression) is evaluated, it should clearly specify what the id-expression will denote(captured by reference) . [expr.prim.lambda#capture-15] totally talks about the case of \u003cstrong\u003ecaptured by copy\u003c/strong\u003e, regardless of simple-capture or init-capture\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eexpr.prim.lambda#capture-12 ... It does not explicitly specify the otherwise case that there's no additional unnamed non-static data member to be declared.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhere do you want to put the «otherwise» part?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eMaybe \u003ccode class=\"notranslate\"\u003eotherwise part\u003c/code\u003e would clarify what entity the id-expression denotes in the compound-statement of the lambda-expression(or in the function body of the call operator of the \u003cstrong\u003eresult object\u003c/strong\u003e), after all, in this case, there's no unnamed NSDN. Such as:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOtherwise, the id-expression in the compound-statement denotes the entity named by the id-expression when the lambda-expression is evaluated.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt could tie the entity named by the id-expression to the id-expression that appears in the call operator function's body of the result object of the lambda-expression.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eGenerally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhy the presence of the corresponding NSDM is relevant when such id-expression is never transformed to member access?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eSince [expr.prim.lambda#capture-12] says\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIf declared, such non-static data members shall be of literal type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eThe implementation can adopt the suggestion to declare an NSDM for this purpose as long as the member is of literal type. So, in this case, the standard should clarify how the member will be initialized when the lambda-expression is evaluated and how the id-expression in the function body will be transformed.\u003c/p\u003e","bodyVersion":"d29b79b5895c327d06d51a5b1c963ddfb8170b095c4325449e28ffd0e6e2daad","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851751089","createdAt":"2021-06-01T01:59:50Z","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":"2021-06-01T02:15:31Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDY1NDk0ODI0"},"__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":"Y3Vyc29yOnYyOpPPAAABecVMafAAqTg1MTc1MTA4OQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851762303,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"languagelawyer","avatarUrl":"https://avatars.githubusercontent.com/u/38548419?v=4","profileUrl":"https://github.com/languagelawyer","id":"MDQ6VXNlcjM4NTQ4NDE5"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTc2MjMwMw==","body":"I still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.","bodyHTML":"\u003cp dir=\"auto\"\u003eI still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.\u003c/p\u003e","bodyVersion":"8bd45fb200f27d6f192c341c73a6fb7e3718f7e3086096bc141f9da22c8c1b87","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851762303","createdAt":"2021-06-01T02:36:14Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABecVtvTAAqTg1MTc2MjMwMw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851764857,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTc2NDg1Nw==","body":"\u003e I still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.\r\n\r\nBecause the standard does not forbid the implementation to declare NSDM for this purpose(capture-by-reference case), since it can declare the member, the use of the id-expression should transform to the corresponding unnamed data member of the closure type; as the same manner as the following: \r\n\u003e Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity captured by copy is transformed into an access to the corresponding unnamed data member of the closure type. \r\n\r\nOtherwise, how is the meaning of adding the unnamed NSDM for `capture-by-reference`? Hence, how the member will be initialized when the lambda-expression is evaluated is meaningful. \r\n\r\nIn contrast, if the implementation adopts the suggestion that does not declare such an NSDM, we should clarify what the id-expression denotes in every result object. Please consider the following example: \r\n````cpp\r\nvoid fun(){\r\n  int a;\r\n static auto f = [\u0026a](){\r\n    a = 10;\r\n };\r\n}\r\nint main(){\r\n  fun();\r\n  fun();\r\n}\r\n````\r\nEven though the `fun` is called twice, however, only at the beginning, the result object `f` is initialized once. Please ignore the UB in this case, we just talk about the meaning of what `a` denotes. We should specify that the id-expression `a` in this result object is tied to the object denoted by the name `a` which is created at the beginning of the invocation of `fun`. In other words,  in the subsequent invocation of `fun`, the id-expression in `f` still denotes the object that is created at the first time the `fun` is called, although the lifetime of the object has ended.","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eI still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eBecause the standard does not forbid the implementation to declare NSDM for this purpose(capture-by-reference case), since it can declare the member, the use of the id-expression should transform to the corresponding unnamed data member of the closure type; as the same manner as the following:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eEvery id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity captured by copy is transformed into an access to the corresponding unnamed data member of the closure type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eOtherwise, how is the meaning of adding the unnamed NSDM for \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e? Hence, how the member will be initialized when the lambda-expression is evaluated is meaningful.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn contrast, if the implementation adopts the suggestion that does not declare such an NSDM, we should clarify what the id-expression denotes in every result object. Please consider the following example:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"void fun(){\n  int a;\n static auto f = [\u0026amp;a](){\n    a = 10;\n };\n}\nint main(){\n  fun();\n  fun();\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-k\"\u003evoid\u003c/span\u003e \u003cspan class=\"pl-en\"\u003efun\u003c/span\u003e(){\n  \u003cspan class=\"pl-k\"\u003eint\u003c/span\u003e a;\n \u003cspan class=\"pl-k\"\u003estatic\u003c/span\u003e \u003cspan class=\"pl-k\"\u003eauto\u003c/span\u003e f = [\u0026amp;a](){\n    a = \u003cspan class=\"pl-c1\"\u003e10\u003c/span\u003e;\n };\n}\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();\n  \u003cspan class=\"pl-c1\"\u003efun\u003c/span\u003e();\n}\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEven though the \u003ccode class=\"notranslate\"\u003efun\u003c/code\u003e is called twice, however, only at the beginning, the result object \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e is initialized once. Please ignore the UB in this case, we just talk about the meaning of what \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e denotes. We should specify that the id-expression \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e in this result object is tied to the object denoted by the name \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e which is created at the beginning of the invocation of \u003ccode class=\"notranslate\"\u003efun\u003c/code\u003e. In other words,  in the subsequent invocation of \u003ccode class=\"notranslate\"\u003efun\u003c/code\u003e, the id-expression in \u003ccode class=\"notranslate\"\u003ef\u003c/code\u003e still denotes the object that is created at the first time the \u003ccode class=\"notranslate\"\u003efun\u003c/code\u003e is called, although the lifetime of the object has ended.\u003c/p\u003e","bodyVersion":"707c8327adb362eda9d3b1541597f3eb768a041c2a94bf30670e3a4fc65381ef","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851764857","createdAt":"2021-06-01T02:45:19Z","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":"2021-06-01T03:04:53Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDY1NTAxODYw"},"__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":"Y3Vyc29yOnYyOpPPAAABecV2DhgAqTg1MTc2NDg1Nw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851786127,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"languagelawyer","avatarUrl":"https://avatars.githubusercontent.com/u/38548419?v=4","profileUrl":"https://github.com/languagelawyer","id":"MDQ6VXNlcjM4NTQ4NDE5"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTc4NjEyNw==","body":"\u003e\u003e I still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.\r\n\u003e\r\n\u003e Because the standard does not forbid the implementation to declare NSDM for this purpose\r\n\r\nWhat is «this purpose» here?\r\n\r\n\u003e since it can declare the member, the use of the id-expression should transform …\r\n\r\nI don't see a logical connection.\r\n\r\n\u003e as the same manner as the following:\r\n\u003e\r\n\u003e\u003e    Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity captured by copy is transformed into an access to the corresponding unnamed data member of the closure type.\r\n\r\nIn the capture-by-copy case, I see the reason to transform an id-expression to class member access. In the capture-by-reference case, I see none.\r\n\r\n\u003e Otherwise, how is the meaning of adding the unnamed NSDM for capture-by-reference?\r\n\r\nIt is implementation's business/details why it adds a NSDM.\r\n\r\n\u003e Hence, how the member will be initialized when the lambda-expression is evaluated is meaningful.\r\n\r\nWhen adding the corresponding NSDM, I think an implementation is no allowed to change the observable behavior other than by changing the size of the closure type. So I don't think there is a need to describe non-observable things such as the initializer of this NSDM.\r\n\r\n\u003e we should clarify what the id-expression denotes in every result object. Please consider the following example\r\n\r\nI understand where the issue is.  I don't see the connection with NSDMs.","bodyHTML":"\u003cblockquote\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eI still don't get why the description of how an id-expression is evaluated in capture-by-reference case should depend on the presence of the corresponding NSDM.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eBecause the standard does not forbid the implementation to declare NSDM for this purpose\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhat is «this purpose» here?\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003esince it can declare the member, the use of the id-expression should transform …\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't see a logical connection.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eas the same manner as the following:\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eEvery id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity captured by copy is transformed into an access to the corresponding unnamed data member of the closure type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIn the capture-by-copy case, I see the reason to transform an id-expression to class member access. In the capture-by-reference case, I see none.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eOtherwise, how is the meaning of adding the unnamed NSDM for capture-by-reference?\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt is implementation's business/details why it adds a NSDM.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eHence, how the member will be initialized when the lambda-expression is evaluated is meaningful.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eWhen adding the corresponding NSDM, I think an implementation is no allowed to change the observable behavior other than by changing the size of the closure type. So I don't think there is a need to describe non-observable things such as the initializer of this NSDM.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003ewe should clarify what the id-expression denotes in every result object. Please consider the following example\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI understand where the issue is.  I don't see the connection with NSDMs.\u003c/p\u003e","bodyVersion":"8d9ed11d97a50773c7241f3d62fc3d05632d12239251c50e208af2d2247328bc","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851786127","createdAt":"2021-06-01T03:56:26Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABecW3KhAAqTg1MTc4NjEyNw=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851812800,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTgxMjgwMA==","body":"\u003e When adding the corresponding NSDM, I think an implementation is no allowed to change the observable behavior other than by changing the size of the closure type. So I don't think there is a need to describe non-observable things such as the initializer of this NSDM.\r\n\r\nPlease note the [expr.prim.lambda#capture-12]  \r\n\u003e It is **unspecified whether additional unnamed non-static data members** are declared in the closure type for entities captured by reference. **If declared**, such non-static data members shall be of literal type.  \r\n\r\nIt appears to me that the standard supplies two options to implement the `capture-by-reference`; One is it does not declare the NSDM and the other is it declared the NSDM for that. It says **If declared**, that means the implementations may take the later option. However, if the implementation takes the later option but the standard does not say more detail about how this case would be, it's underspecified. Hence, I think the issue of what entity the id-expression would be tied to in each result object of lambda-expression also exists in this option. Since the standard defines the rule about NSDM for `capture-by-copy` case, why does not it define a similar rule for `NSDM` in `capture-by-reference` case, if the implementation takes that option? I think the non-observable thing here is which option the implementation takes for implementing `capture-by-reference`.\r\n\r\n\u003e In the capture-by-reference case, I see none.\r\n\r\nIf the implementation takes the latter option, namely add the unnamed NSDM for implementing `capture-by-reference`, if we do not define the rule for transforming the original id-expression to the declared unnamed NSDM? what's the meaningful of the latter option?","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eWhen adding the corresponding NSDM, I think an implementation is no allowed to change the observable behavior other than by changing the size of the closure type. So I don't think there is a need to describe non-observable things such as the initializer of this NSDM.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003ePlease note the [expr.prim.lambda#capture-12]\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIt is \u003cstrong\u003eunspecified whether additional unnamed non-static data members\u003c/strong\u003e are declared in the closure type for entities captured by reference. \u003cstrong\u003eIf declared\u003c/strong\u003e, such non-static data members shall be of literal type.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIt appears to me that the standard supplies two options to implement the \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e; One is it does not declare the NSDM and the other is it declared the NSDM for that. It says \u003cstrong\u003eIf declared\u003c/strong\u003e, that means the implementations may take the later option. However, if the implementation takes the later option but the standard does not say more detail about how this case would be, it's underspecified. Hence, I think the issue of what entity the id-expression would be tied to in each result object of lambda-expression also exists in this option. Since the standard defines the rule about NSDM for \u003ccode class=\"notranslate\"\u003ecapture-by-copy\u003c/code\u003e case, why does not it define a similar rule for \u003ccode class=\"notranslate\"\u003eNSDM\u003c/code\u003e in \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e case, if the implementation takes that option? I think the non-observable thing here is which option the implementation takes for implementing \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eIn the capture-by-reference case, I see none.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eIf the implementation takes the latter option, namely add the unnamed NSDM for implementing \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e, if we do not define the rule for transforming the original id-expression to the declared unnamed NSDM? what's the meaningful of the latter option?\u003c/p\u003e","bodyVersion":"acf5407489f686cc94314889dbaa984d13de4e9ae2f050a4b2530f6f7a7b16fe","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851812800","createdAt":"2021-06-01T05:16:05Z","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":"2021-06-01T05:25:34Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDY1NTIyNzQ4"},"__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":"Y3Vyc29yOnYyOpPPAAABecYAFggAqTg1MTgxMjgwMA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851886356,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTg4NjM1Ng==","body":"I'm seeing the following problem being described:\r\n\r\nThe note in [expr.prim.lambda.capture] p16 lacks normative wording to base it on. In particular, it should be made clear that the *evaluation* of a lambda-expression causes the reference binding of entities captured by reference, and that (later) evaluation of an id-expression that names an entity captured by reference uses that reference binding (which might refer to an out-of-lifetime object).","bodyHTML":"\u003cp dir=\"auto\"\u003eI'm seeing the following problem being described:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe note in [expr.prim.lambda.capture] p16 lacks normative wording to base it on. In particular, it should be made clear that the \u003cem\u003eevaluation\u003c/em\u003e of a lambda-expression causes the reference binding of entities captured by reference, and that (later) evaluation of an id-expression that names an entity captured by reference uses that reference binding (which might refer to an out-of-lifetime object).\u003c/p\u003e","bodyVersion":"0389f1962e68a6d9334e3840bac7a535fe57d14f9c9f0b40fafa68e062f6ef73","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851886356","createdAt":"2021-06-01T07:16:32Z","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":"Y3Vyc29yOnYyOpPPAAABecZuXIAAqTg1MTg4NjM1Ng=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851897402,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTg5NzQwMg==","body":"http://lists.isocpp.org/core/2021/06/index.php","bodyHTML":"\u003cp dir=\"auto\"\u003e\u003ca href=\"http://lists.isocpp.org/core/2021/06/index.php\" rel=\"nofollow\"\u003ehttp://lists.isocpp.org/core/2021/06/index.php\u003c/a\u003e\u003c/p\u003e","bodyVersion":"266fd42fb63f579948ea261e18ed3553272b555d237828540abf013470321d21","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851897402","createdAt":"2021-06-01T07:33:50Z","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":"Y3Vyc29yOnYyOpPPAAABecZ-MzAAqTg1MTg5NzQwMg=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":851899908,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDg1MTg5OTkwOA==","body":"\u003e I'm seeing the following problem being described:\r\n\u003e \r\n\u003e The note in [expr.prim.lambda.capture] p16 lacks normative wording to base it on. In particular, it should be made clear that the _evaluation_ of a lambda-expression causes the reference binding of entities captured by reference, and that (later) evaluation of an id-expression that names an entity captured by reference uses that reference binding (which might refer to an out-of-lifetime object).\r\n\r\nYes, I exactly mean that. The standard introduces two options to implement `capture-by-reference`. We should clarify the above situation for these two options, respectively. It lacks in the current draft.","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eI'm seeing the following problem being described:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe note in [expr.prim.lambda.capture] p16 lacks normative wording to base it on. In particular, it should be made clear that the \u003cem\u003eevaluation\u003c/em\u003e of a lambda-expression causes the reference binding of entities captured by reference, and that (later) evaluation of an id-expression that names an entity captured by reference uses that reference binding (which might refer to an out-of-lifetime object).\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eYes, I exactly mean that. The standard introduces two options to implement \u003ccode class=\"notranslate\"\u003ecapture-by-reference\u003c/code\u003e. We should clarify the above situation for these two options, respectively. It lacks in the current draft.\u003c/p\u003e","bodyVersion":"e49348189683db40c2c08baa1f51ca3ee63f46213154e9ecfff33d95848a9a8a","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-851899908","createdAt":"2021-06-01T07:38:00Z","authorAssociation":"CONTRIBUTOR","viewerCanDelete":false,"viewerCanMinimize":false,"viewerCanUnminimize":false,"viewerCanReport":false,"viewerCanReportToMaintainer":false,"viewerCanBlockFromOrg":false,"viewerCanUnblockFromOrg":false,"viaApp":null,"isHidden":false,"minimizedReason":null,"showSpammyBadge":false,"createdViaEmail":false,"authorToRepoOwnerSponsorship":null,"repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","name":"draft","owner":{"__typename":"Organization","id":"MDEyOk9yZ2FuaXphdGlvbjU5Mjc2","login":"cplusplus","url":"https://github.com/cplusplus"},"isPrivate":false,"slashCommandsEnabled":false,"nameWithOwner":"cplusplus/draft","databaseId":2216249},"__isComment":"IssueComment","viewerCanReadUserContentEdits":true,"lastEditedAt":null,"lastUserContentEdit":null,"__isReactable":"IssueComment","reactionGroups":[{"content":"THUMBS_UP","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"THUMBS_DOWN","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"LAUGH","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HOORAY","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"CONFUSED","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"HEART","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"ROCKET","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}},{"content":"EYES","viewerHasReacted":false,"reactors":{"totalCount":0,"nodes":[]}}],"__isNode":"IssueComment"},"cursor":"Y3Vyc29yOnYyOpPPAAABecaCA8AAqTg1MTg5OTkwOA=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":852061211,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"jensmaurer","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?v=4","profileUrl":"https://github.com/jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1"},"id":"MDEyOklzc3VlQ29tbWVudDg1MjA2MTIxMQ==","body":"I don't think we need to differentiate those two options as long as we say what the effects are.","bodyHTML":"\u003cp dir=\"auto\"\u003eI don't think we need to differentiate those two options as long as we say what the effects are.\u003c/p\u003e","bodyVersion":"7fe97fc015bd7d4e644cb3280fb33169a01d473b11bb82123bca070fd8bb7583","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-852061211","createdAt":"2021-06-01T11:50:11Z","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":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":"Y3Vyc29yOnYyOpPPAAABecdo5TgAqTg1MjA2MTIxMQ=="},{"node":{"__typename":"IssueComment","__isIssueTimelineItems":"IssueComment","databaseId":852117706,"viewerDidAuthor":false,"issue":{"author":{"__typename":"User","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDU6SXNzdWU5MDc0MTA5NzQ=","number":4619,"locked":false,"databaseId":907410974},"author":{"__typename":"User","login":"xmh0511","avatarUrl":"https://avatars.githubusercontent.com/u/17973891?u=4644fae26cfb3747712a5956cb193f4067b86016\u0026v=4","profileUrl":"https://github.com/xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDEyOklzc3VlQ29tbWVudDg1MjExNzcwNg==","body":"\u003e I don't think we need to differentiate those two options as long as we say what the effects are.\r\n\r\nI don't know how the concrete normative rule would be, maybe such two options can be unified described by that rule. However, in my humble opinion, if we adopt the latter option(namely, **introduce an additional unnamed NSDM**), the use of the id-expression in the compound-statement of the lambda-expression will be replaced by using that member. For the above example, the use of the id-expression `a` in `a = 1; //#3` will look like\r\n````cpp\r\nthis-\u003eunnamed_member_for_a = 1;\r\n````\r\nThis means the member should be initialized in order to refer to the entity captured by reference when the lambda-expression is evaluated to initialize its result object. Instead, the former option does not have the additional member, hence there's no member to be initialized and no transformation for the id-expression, where I think the difference is here. Specifically, for the former option, we should state the rule to make the id-expression clearly refer to the captured entity. For the latter option, we should state the rule to make the **additional member** clearly refer to the captured entity.","bodyHTML":"\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't think we need to differentiate those two options as long as we say what the effects are.\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cp dir=\"auto\"\u003eI don't know how the concrete normative rule would be, maybe such two options can be unified described by that rule. However, in my humble opinion, if we adopt the latter option(namely, \u003cstrong\u003eintroduce an additional unnamed NSDM\u003c/strong\u003e), the use of the id-expression in the compound-statement of the lambda-expression will be replaced by using that member. For the above example, the use of the id-expression \u003ccode class=\"notranslate\"\u003ea\u003c/code\u003e in \u003ccode class=\"notranslate\"\u003ea = 1; //#3\u003c/code\u003e will look like\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-c++ notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"this-\u0026gt;unnamed_member_for_a = 1;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003cspan class=\"pl-c1\"\u003ethis\u003c/span\u003e-\u0026gt;unnamed_member_for_a = \u003cspan class=\"pl-c1\"\u003e1\u003c/span\u003e;\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis means the member should be initialized in order to refer to the entity captured by reference when the lambda-expression is evaluated to initialize its result object. Instead, the former option does not have the additional member, hence there's no member to be initialized and no transformation for the id-expression, where I think the difference is here. Specifically, for the former option, we should state the rule to make the id-expression clearly refer to the captured entity. For the latter option, we should state the rule to make the \u003cstrong\u003eadditional member\u003c/strong\u003e clearly refer to the captured entity.\u003c/p\u003e","bodyVersion":"965445d0bca5c195b69ef06bb26ba36e62c5b4f987251f6e7a8d02b62b199fdc","viewerCanUpdate":false,"url":"https://github.com/cplusplus/draft/issues/4619#issuecomment-852117706","createdAt":"2021-06-01T13:19:08Z","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":"2021-06-01T13:22:57Z","lastUserContentEdit":{"editor":{"__typename":"User","url":"https://github.com/xmh0511","login":"xmh0511","id":"MDQ6VXNlcjE3OTczODkx"},"id":"MDE1OlVzZXJDb250ZW50RWRpdElzc3VlQ29tbWVudEVkaXQ6NDY1NjUxMzM0"},"__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":"Y3Vyc29yOnYyOpPPAAABece6VOAAqTg1MjExNzcwNg=="},{"node":{"__typename":"RenamedTitleEvent","__isIssueTimelineItems":"RenamedTitleEvent","__isTimelineEvent":"RenamedTitleEvent","databaseId":4835857753,"createdAt":"2021-06-03T07:32:48Z","actor":{"__typename":"User","login":"jensmaurer","id":"MDQ6VXNlcjIzNDEyNzU1","__isActor":"User","avatarUrl":"https://avatars.githubusercontent.com/u/23412755?s=64\u0026v=4","profileResourcePath":"/jensmaurer"},"currentTitle":"[expr.prim.lambda.capture] Which entity does the id-expression captured by reference refer to after evaluating the lambda-expression?","previousTitle":"The description for which entity does the id-expression captured by reference refer to after evaluating the lambda-expression","__isNode":"RenamedTitleEvent","id":"MDE3OlJlbmFtZWRUaXRsZUV2ZW50NDgzNTg1Nzc1Mw=="},"cursor":"Y3Vyc29yOnYyOpPPAAABedDJ-QABqjQ4MzU4NTc3NTM="}]},"backTimelineItems":{"pageInfo":{"hasPreviousPage":true,"startCursor":null},"totalCount":14,"edges":[]}},"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5"},"safeViewer":null}},"timestamp":1759108697}]},"title":null,"appPayload":{"initial_view_content":{"team_id":null,"can_edit_view":true},"current_user":null,"current_user_settings":{"preferred_emoji_skin_tone":null,"copilot_show_functionality":false,"use_single_key_shortcut":false},"paste_url_link_as_plain_text":false,"base_avatar_url":"https://avatars.githubusercontent.com","help_url":"https://docs.github.com","sso_organizations":null,"current_sso_orgs_match_dismissed_cookie":null,"multi_tenant":false,"tracing":false,"tracing_flamegraph":false,"catalog_service":"github/issues","scoped_repository":{"id":"MDEwOlJlcG9zaXRvcnkyMjE2MjQ5","owner":"cplusplus","name":"draft","is_archived":false},"enabled_features":{"use_pull_request_subscriptions_enabled":false,"pull_request_single_subscription":true,"disable_issues_react_ssr":false,"issue_dependencies":true,"copilot_natural_language_github_search":false,"private_avatars":false,"reserved_domain":true,"projects_classic_sunset_override":false,"issues_react_bypass_es_limits":true,"notifyd_issue_watch_activity_notify":false,"notifyd_enable_issue_thread_subscriptions":false,"timeline_best_effort_count_optimization":false,"copilot_auto_assign_metadata":false,"issues_react_bots_timeline_pagination":true,"copilot_workspace_cross_repo_selection":false,"copilot_agent_mode":true,"issues_react_force_turbo_nav":false,"copilot_swe_agent":true,"copilot_workspace":null,"tasklist_block":false,"issues_react_perf_test":false}}}</script>
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<p dir="auto">[expr.prim.lambda#capture-15] When the lambda-expression is evaluated, the entities that are captured by copy are used to direct-initialize each corresponding non-static data member of the resulting closure object, and the non-static data members corresponding to the init-captures are initialized as indicated by the corresponding initializer (which may be copy- or direct-initialization). (For array members, the array elements are direct-initialized in increasing subscript order.) These initializations are performed in the (unspecified) order in which the non-static data members are declared.</p>
</blockquote>
<p dir="auto">It is underspecified about which entity the id-expression <strong>captured by reference</strong>  refers to when the lambda-expression is evaluated.  For instance:</p>
<div class="highlight highlight-source-c++ notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="void fun(){
  int a;
 auto f = [&amp;a](){
    a = 1; //#3
 };
}
int main(){
  fun(); //#1
  fun(); //#2
}"><pre class="notranslate"><span class="pl-k">void</span> <span class="pl-en">fun</span>(){
  <span class="pl-k">int</span> a;
 <span class="pl-k">auto</span> f = [&amp;a](){
    a = <span class="pl-c1">1</span>; <span class="pl-c"><span class="pl-c">//</span>#3</span>
 };
}
<span class="pl-k">int</span> <span class="pl-en">main</span>(){
  <span class="pl-c1">fun</span>(); <span class="pl-c"><span class="pl-c">//</span>#1</span>
  <span class="pl-c1">fun</span>(); <span class="pl-c"><span class="pl-c">//</span>#2</span>
}</pre></div>
<p dir="auto">In major implementations, each invocation of the function <code class="notranslate">fun</code> will make that the id-expression  <code class="notranslate">a</code> at <code class="notranslate">#3</code> denotes the different object.  In other words, the evaluation of the prvalue lambda-expression will initialize its result object which is <code class="notranslate">f</code>, however, the standard does not specify what object the id-expression <code class="notranslate">a</code> will refer to in every result function object <code class="notranslate">f</code>.</p>
<p dir="auto">The rule  for an entity that is captured by reference  is defined as the following:</p>
<blockquote>
<p dir="auto">[expr.prim.lambda#capture-12] An entity is captured by reference if it is implicitly or explicitly captured but not captured by copy. It is unspecified whether additional unnamed non-static data members are declared in the closure type for entities captured by reference. If declared, such non-static data members shall be of literal type.</p>
</blockquote>
<p dir="auto">It does not explicitly specify the <code class="notranslate">otherwise</code> case that there's no additional unnamed non-static data member to be declared. So, we may unclear know what entity the id-expression refers to when the lambda-expression is evaluated, where the id-expression is captured by reference. As far as I know, the following rule does not apply to the above example as well.</p>
<blockquote>
<p dir="auto">[expr.prim.lambda#capture-13] An id-expression within the compound-statement of a lambda-expression that is an odr-use of a <strong>reference</strong> captured by reference refers to the entity to which the captured reference is bound and not to the captured reference.</p>
</blockquote>
<p dir="auto">Since in the simple-capture <code class="notranslate">&amp;a</code> where <code class="notranslate">a</code> is not a reference. Instead, it's an object.</p>
<p dir="auto">In addition, even though the unnamed non-static data member is declared for such capture(captured by reference), I think the following rule is still not suitable for that case</p>
<blockquote>
<p dir="auto">[expr.prim.lambda#capture-11] Every id-expression within the compound-statement of a lambda-expression that is an odr-use of an entity <strong>captured by copy</strong> is transformed into an access to the corresponding unnamed data member of the closure type.</p>
</blockquote>
<p dir="auto">Also, [expr.prim.lambda#capture-15] does not specify how the initialization would be for the unnamed non-static data member declared for the case captured by reference.</p>
<p dir="auto">Generally, the standard has no wording about what the id-expression would denote if it's reference capture in two cases(has/has no the corresponding unnamed non-static data member).</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 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eidMeE"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU iWDiln"></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 dRdjrc"></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 iUqXOB"></div></div></div></div></div></div><div><div class="CommentLoading-module__CommentLoadingContainer--I9JkW"><div height="40px" width="40px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 kqdiwS gALJmv"></div><div class="CommentLoading-module__CommentLoadingContentWrapper--Qd0Vg"><div class="CommentDivider-module__CommentDividerContainer--fCCZA"><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerLeftLine--TwR8y"></div><div class="Box-sc-g0xbh4-0 HpFDd CommentDivider-module__CommentDividerRightLine--_guT1"></div></div><div data-testid="comment-skeleton" class="CommentLoading-module__CommentLoadingCard--QQ_c8"><div class="CommentLoading-module__CommentLoadingHeader--_JjPE"><div height="sm" width="150px" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 jKxfJf gpOnMk"></div></div><div class="CommentLoading-module__CommentLoadingContent--QWS3r"><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU jhemUW"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gKqNAx"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU dRdjrc"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU iUqXOB"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU infpTv"></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 isIkcH"></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 dRlina"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gmBcjw"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU gdffFr"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU zyzbf"></div><div height="sm" width="random" class="Box-sc-g0xbh4-0 LoadingSkeleton-sc-14d3f1fe-0 hpcToU isIkcH"></div></div></div></div></div></div></div><!--/$--></div></div></div><div data-testid="issue-viewer-metadata-container" class="Box-sc-g0xbh4-0 cLtwuV IssueViewer-module__metadataSidebar--QdJ2b"><div class="IssueViewer-module__issueViewerMetadataPane--i01ta" data-testid="issue-viewer-metadata-pane"><h2 class="IssueViewer-module__metadataHeader--OGi4i prc-Heading-Heading-6CmGO">Metadata</h2><h2 class="IssueViewer-module__largeScreenMetadataHeader--xPLHt sr-only prc-Heading-Heading-6CmGO">Metadata</h2><div data-testid="sticky-sidebar"><div class="IssueSidebar-module__sidebarContent--II51T"><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Assignees</h3></div><span class="Section-module__emptyText--qZ0Bc">No one assigned</span><div class="Section-module__hiddenChildrenContainer--X126P"><ul class="prc-ActionList-ActionList-X4RiC Assignees-module__assigneesList--JFnuE" data-dividers="false" data-variant="full"></ul></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Labels</h3></div><span class="Section-module__emptyText--qZ0Bc">No labels</span><div class="Section-module__hiddenChildrenContainer--X126P"><div tabindex="-1" data-testid="issue-labels" class="Box-sc-g0xbh4-0 LabelsList-module__labelsListContainer--bS7BO">No labels</div></div></div></div><div data-testid="sidebar-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Type</h3></div><span class="Section-module__emptyText--qZ0Bc">No type</span><div class="Section-module__hiddenChildrenContainer--X126P"><div class="TypesSection-module__typeContainer--YI5mY"><div class="IssueType-module__hiddenPlaceholder--nnfV9"></div></div></div></div></div><!--$--><div data-testid="sidebar-projects-section" class="Box-sc-g0xbh4-0 bbGjsc Section-module__SectionContainer--bIlEv"><div class="Section-module__headerContentWrapper--OIm9m"><div class="Box-sc-g0xbh4-0 bwxuvd"><h3 class="Box-sc-g0xbh4-0 bpDFns SectionHeader-module__SectionHeaderTitle--TxSJL prc-Heading-Heading-6CmGO">Projects</h3></div><span class="Section-module__emptyText--qZ0Bc">No projects</span><div class="Section-module__hiddenChildrenContainer--X126P"><div class="ProjectsSection-module__projectItemsContainer--XwAWz"></div></div></div></div><!--/$--><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">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 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</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>

