This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++23 status.
__cpp_lib_constexpr_algorithms should also be defined in <utility>Section: 17.3.2 [version.syn] Status: C++23 Submitter: Marc Mutz Opened: 2022-10-05 Last modified: 2023-11-22
Priority: Not Prioritized
View other active issues in [version.syn].
View all other issues in [version.syn].
View all issues with C++23 status.
Discussion:
17.3.2 [version.syn] says that __cpp_lib_constexpr_algorithms is only defined
in <version> and <algorithm>, but the macro applies to std::exchange()
in <utility> as well (via P0202R3), so it should also be available from
<utility>.
[2022-10-12; Reflector poll]
Set status to Tentatively Ready after eight votes in favour during reflector poll.
[2022-11-12 Approved at November 2022 meeting in Kona. Status changed: Voting → WP.]
Proposed resolution:
This wording is relative to N4917.
Modify 17.3.2 [version.syn] as indicated (It is suggested to retroactively apply to C++20):
[…] #define __cpp_lib_concepts 202207L // also in <concepts>, <compare> #define __cpp_lib_constexpr_algorithms 201806L // also in <algorithm>, <utility> #define __cpp_lib_constexpr_bitset 202202L // also in <bitset> […]