allocation_result specializations are returned from the allocate_at_least member function of appropriate Allocator types (e.g. std::allocator::allocate_at_least) and std::allocator_traits::allocate_at_least.
Every specialization of allocation_result has no base classes or declared members other than ptr and count, thus it is suitable for aggregate initialization and structured binding.
Pointer which is typically used for the address of the first element in the storage allocated by allocate_at_least
SizeType which is typically used for the actual number of elements in the storage allocated by allocate_at_least
Pointer and SizeType are a pointer to an object type and std::make_unsigned_t<std::ptrdiff_t> (which is almost always same as std::size_t) by default.
std::allocator<T>) [edit] allocates storage at least as large as the requested size via an allocator
std::allocator_traits<Alloc>) [edit]
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