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

How the allocator is propagated on swap

Synopsis

Declared in <bslma_allocatortraits.h>

using propagate_on_container_swap = __detected_or_t<false_type, __pocs, _Alloc>;

Alloc::propagate_on_container_swap if that type exists, otherwise false_type

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