|  | 
Class used to specify that an asynchronous operation should return a future.
template< typename Allocator = std::allocator<void>> class use_future_t
| Name | Description | 
|---|---|
| The allocator type. The allocator is used when constructing the std::promise object for a given asynchronous operation. | 
| Name | Description | 
|---|---|
| Obtain allocator. | |
| Specify an alternate allocator. | |
| Construct using default-constructed allocator. Construct using specified allocator. | 
        The use_future_t
        class is used to indicate that an asynchronous operation should return a
        std::future object. A use_future_t object may be passed
        as a handler to an asynchronous operation, typically using the special value
        asio::use_future. For example:
      
std::future<std::size_t> my_future = my_socket.async_read_some(my_buffer, asio::use_future);
        The initiating function (async_read_some in the above example) returns a
        future that will receive the result of the operation. If the operation completes
        with an error_code
        indicating failure, it is converted into a system_error and passed back to
        the caller via the future.
      
        Header: asio/use_future.hpp
      
Convenience header: None