|  | 
        The execution::is_executor
        trait detects whether a type T satisfies the execution::executor concept.
      
template< typename T> struct is_executor : public integral_constant< bool, automatically_determined >
        Class template is_executor
        is a UnaryTypeTrait that is derived from true_type
        if the type T meets the concept
        definition for an executor, otherwise false_type.
      
        Header: asio/execution/executor.hpp
      
        Convenience header: asio/execution.hpp