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template<
    typename Service>
bool has_service(
    execution_context & e);
        This function is used to determine whether the execution_context
        contains a service object corresponding to the given service type.
      
              The execution_context
              object that owns the service.
            
        A boolean indicating whether the execution_context
        contains the service.
      
        Header: boost/asio/impl/execution_context.hpp
      
        Convenience header: boost/asio.hpp