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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Implement standard concepts"
href="https://bugs.llvm.org/show_bug.cgi?id=48876">48876</a>
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<th>Summary</th>
<td>Implement standard concepts
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>cjdb.ns@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<pre>This bug tracks the implementation of concepts from [[concepts]][1].
## Success criteria
* All concepts in [concepts] are implemented.
* libc++ C++20 status notes show that [P0898][9] and relevant LWG issues are
completed.
## Concepts merged into libc++ at the time of filing
* [std::same_as][2] (D74291)
* [std::destructible][3] (D91004)
## Concepts with open patches in Phabricator
* [std::derived_from][4] (D74292)
* [Arithmetic concepts][5] (D88131)
* [std::constructible_from][6] (D91986)
* [std::default_initializable][7] (D93461)
## WIP patches
* [std::convertible_to][8] (D77961)
[1]: <a href="http://wg21.link/concepts">http://wg21.link/concepts</a>
[2]: <a href="http://wg21.link/concept.same">http://wg21.link/concept.same</a>
[3]: <a href="http://wg21.link/concept.destructible">http://wg21.link/concept.destructible</a>
[4]: <a href="http://wg21.link/concept.derived">http://wg21.link/concept.derived</a>
[5]: <a href="http://wg21.link/concepts.arithmetic">http://wg21.link/concepts.arithmetic</a>
[6]: <a href="http://wg21.link/concept.constructible">http://wg21.link/concept.constructible</a>
[7]: <a href="http://wg21.link/concept.default.init">http://wg21.link/concept.default.init</a>
[8]: <a href="http://wg21.link/concept.convertible">http://wg21.link/concept.convertible</a>
[9]: <a href="http://wg21.link/p0898">http://wg21.link/p0898</a></pre>
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