class template
<future>
std::uses_allocator<promise>
template <class T, class Alloc>
struct uses_allocator<promise<T>,Alloc>;
Uses allocator for promise
This trait specialization of uses_allocator informs that promise objects can be constructed with allocators, even though the class does not have any allocator_type member. It is defined in the <future> with the same behavior as:
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template <class T, class Alloc>
struct uses_allocator<promise<T>,Alloc> : true_type {};
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