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| Original file line number | Diff line number | Diff line change |
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| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <title>Issue 4131: Including <optional> doesn't provide std::begin/end</title> | ||
| <meta property="og:title" content="Issue 4131: Including <optional> doesn't provide std::begin/end"> | ||
| <meta property="og:description" content="C++ library issue. Status: New"> | ||
| <meta property="og:url" content="https://cplusplus.github.io/LWG/issue4131.html"> | ||
| <meta property="og:type" content="website"> | ||
| <meta property="og:image" content="http://cplusplus.github.io/LWG/images/cpp_logo.png"> | ||
| <meta property="og:image:alt" content="C++ logo"> | ||
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| <body> | ||
| <hr> | ||
| <p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p> | ||
| <h3 id="4131"><a href="lwg-active.html#4131">4131</a>. Including <code><optional></code> doesn't provide <code>std::begin/end</code></h3> | ||
| <p><b>Section:</b> 25.7 <a href="https://wg21.link/iterator.range">[iterator.range]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a> | ||
| <b>Submitter:</b> Hewill Kang <b>Opened:</b> 2024-08-02 <b>Last modified:</b> 2024-08-03</p> | ||
| <p><b>Priority: </b>Not Prioritized | ||
| </p> | ||
| <p><b>View other</b> <a href="lwg-index-open.html#iterator.range">active issues</a> in [iterator.range].</p> | ||
| <p><b>View all other</b> <a href="lwg-index.html#iterator.range">issues</a> in [iterator.range].</p> | ||
| <p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p> | ||
| <p><b>Discussion:</b></p> | ||
| <p> | ||
| Since <code>optional</code> now provides <code>begin/end</code> members, it is reasonable | ||
| to ensure the validity of <code>std::begin/end</code> after including <code><optional></code>. | ||
| </p> | ||
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| <p id="res-4131"><b>Proposed resolution:</b></p> | ||
| <p> | ||
| This wording is relative to <a href="https://wg21.link/N4986" title=" Working Draft, Programming Languages — C++">N4986</a>. | ||
| </p> | ||
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| <ol> | ||
| <li><p>Modify 25.7 <a href="https://wg21.link/iterator.range">[iterator.range]</a> as indicated:</p> | ||
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| <blockquote> | ||
| <p> | ||
| -1- In addition to being available via inclusion of the <code><iterator></code> header, the function | ||
| templates in 25.7 <a href="https://wg21.link/iterator.range">[iterator.range]</a> are available when any of the following headers are included: | ||
| <code><array></code> (24.3.2 <a href="https://wg21.link/array.syn">[array.syn]</a>), | ||
| <code><deque></code> (24.3.3 <a href="https://wg21.link/deque.syn">[deque.syn]</a>), | ||
| <code><flat_map></code> (24.6.4 <a href="https://wg21.link/flat.map.syn">[flat.map.syn]</a>), | ||
| <code><flat_set></code> (24.6.5 <a href="https://wg21.link/flat.set.syn">[flat.set.syn]</a>), | ||
| <code><forward_list></code> (24.3.4 <a href="https://wg21.link/forward.list.syn">[forward.list.syn]</a>), | ||
| <code><inplace_vector></code> (24.3.7 <a href="https://wg21.link/inplace.vector.syn">[inplace.vector.syn]</a>), | ||
| <code><list></code> (24.3.5 <a href="https://wg21.link/list.syn">[list.syn]</a>), | ||
| <code><map></code> (24.4.2 <a href="https://wg21.link/associative.map.syn">[associative.map.syn]</a>), | ||
| <ins><code><optional></code> (22.5.2 <a href="https://wg21.link/optional.syn">[optional.syn]</a>),</ins> | ||
| <code><regex></code> (32.3 <a href="https://wg21.link/re.syn">[re.syn]</a>), | ||
| <code><set></code> (24.4.3 <a href="https://wg21.link/associative.set.syn">[associative.set.syn]</a>), | ||
| <code><span></code> (24.7.2.1 <a href="https://wg21.link/span.syn">[span.syn]</a>), | ||
| <code><string></code> (23.4.2 <a href="https://wg21.link/string.syn">[string.syn]</a>), | ||
| <code><string_view></code> (23.3.2 <a href="https://wg21.link/string.view.synop">[string.view.synop]</a>), | ||
| <code><unordered_map></code> (24.5.2 <a href="https://wg21.link/unord.map.syn">[unord.map.syn]</a>), | ||
| <code><unordered_set></code> (24.5.3 <a href="https://wg21.link/unord.set.syn">[unord.set.syn]</a>), | ||
| and <code><vector></code> (24.3.6 <a href="https://wg21.link/vector.syn">[vector.syn]</a>). | ||
| </p> | ||
| </blockquote> | ||
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| </html> |
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