[llvm-bugs] [Bug 48876] New: Implement standard concepts

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48876

            Bug ID: 48876
           Summary: Implement standard concepts
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: cjdb.ns at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

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]: http://wg21.link/concepts
[2]: http://wg21.link/concept.same
[3]: http://wg21.link/concept.destructible
[4]: http://wg21.link/concept.derived
[5]: http://wg21.link/concepts.arithmetic
[6]: http://wg21.link/concept.constructible
[7]: http://wg21.link/concept.default.init
[8]: http://wg21.link/concept.convertible
[9]: http://wg21.link/p0898

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