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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. | |
| Wrap a function object in a packaged task. | |
| (Deprecated: Use rebind().) Specify an alternate allocator. | |
| Specify an alternate allocator. | |
| 
                  Construct using default-constructed 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 boost::asio::use_future. For example:
      
std::future<std::size_t> my_future = my_socket.async_read_some(my_buffer, boost::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: boost/asio/use_future.hpp
      
        Convenience header: boost/asio.hpp