# std::uses_allocator<std::experimental::promise>

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< cpp‎ | experimental‎ | lib extensions‎ | promise

Defined in header `<experimental/future>` |  |
template< class R, class Alloc > struct uses_allocator<std::experimental::promise<R>, Alloc> : std::true_type {}; |  | (library fundamentals TS)

This specialization of std::uses_allocator informs other library components that all objects of type std::experimental::promise support uses-allocator construction.

## Inherited from std::integral_constant

### Member constants

value [static] | true (public static member constant)

### Member functions

operator bool | converts the object to bool, returns value (public member function)
operator() (C++14) | returns value (public member function)

### Member types

Type | Definition
`value_type` | bool
`type` | std::integral_constant<bool, value>

### See also

uses_allocator (C++11) | checks if the specified type supports uses-allocator construction (class template)

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