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        The uses_executor
        trait detects whether a type T has an associated executor that is convertible
        from type Executor.
      
template< typename T, typename Executor> struct uses_executor : public false_type
        Meets the BinaryTypeTrait requirements. The Asio library provides a definition
        that is derived from false_type. A program may specialize this template to
        derive from true_type for a user-defined type T that can be constructed with
        an executor, where the first argument of a constructor has type executor_arg_t and the second argument
        is convertible from type Executor.
      
        Header: asio/uses_executor.hpp
      
        Convenience header: asio.hpp