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Obtain the service object corresponding to the given type.
template< typename Service> Service & use_service( execution_context & e);
            This function is used to locate a service object that corresponds to
            the given service type. If there is no existing implementation of the
            service, then the execution_context will create
            a new instance of the service.
          
                  The execution_context object
                  that owns the service.
                
The service interface implementing the specified service type. Ownership of the service interface is not transferred to the caller.
            Header: asio/execution_context.hpp
          
            Convenience header: asio/execution.hpp