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[libc++] P3372R3: constexpr unordered_multimap #128667

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frederick-vs-ja opened this issue Feb 25, 2025 · 0 comments
Open

[libc++] P3372R3: constexpr unordered_multimap #128667

frederick-vs-ja opened this issue Feb 25, 2025 · 0 comments
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c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.

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Make unordered_multimap constexpr as part of P3372R3.

Note that node-handle::key() is intentionally left not constexpr, and the constexpr-ness largely requires a user-defined hash functor.

Feature-test macro (also covers constexpr unordered_map):

#define __cpp_lib_constexpr_unordered_map 202502L // also in <unordered_map>
@frederick-vs-ja frederick-vs-ja added c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. labels Feb 25, 2025
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c++26 libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.
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