bsl::allocator_traits<std::allocator<ALLOCATOR_TYPE>>::is_always

Whether all instances of the allocator type compare equal.

Synopsis

Declared in <bslma_allocatortraits.h>

using is_always_equal = __detected_or_t<is_empty<_Alloc>, __equal, _Alloc>::type;

Alloc::is_always_equal if that type exists, otherwise is_empty<Alloc>::type

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