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        (Deprecated: Use two-parameter version of async_result.)
        An interface for customising the behaviour of an initiating function.
      
template<
    typename Handler>
class async_result< Handler >
| Name | Description | 
|---|---|
| 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. | 
This template may be specialised for user-defined handler types.
        Header: boost/asio/async_result.hpp
      
        Convenience header: boost/asio.hpp