Implement LWG-4312 Const and value category mismatch for allocator_arg_t/allocator_arg in the description of uses-allocator construction#5904
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StephanTLavavej merged 1 commit intomicrosoft:mainfrom Nov 27, 2025
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Fixes #5866.
Note that the difference between
allocator_arg/allocator_arg_t{}is only observable for (contrived) user-defined types, so we only need to modify_Tuple_valand_Uses_alloc_construct_non_pair(pre-C++20 only).For
scoped_allocator_adaptorandpolymorphic_allocator, the changes make the pre-C++20 behavior more consistent and closer to C++20 behavior.