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An interface for customising the behaviour of an initiating function.
template<
    typename CompletionToken,
    typename Signature>
class async_result
| Name | Description | 
|---|---|
| The concrete completion handler type for the specific signature. | |
| The return type of the initiating function. | 
| Name | Description | 
|---|---|
| Construct an async result from a given handler. | |
| Obtain the value to be returned from the initiating function. | |
| Initiate the asynchronous operation that will produce the result, and obtain the value to be returned from the initiating function. | 
        The async_result
        traits class is used for determining:
      
The trait allows the handler and return types to be determined at the point where the specific completion handler signature is known.
This template may be specialised for user-defined completion token types. The primary template assumes that the CompletionToken is the completion handler.
        Header: boost/asio/async_result.hpp
      
        Convenience header: boost/asio.hpp