The is_async_operation trait detects whether a type T and arguments Args... may be used to initiate an asynchronous operation.

template<
    typename T,
    typename... Args>
struct is_async_operation :
  public integral_constant< bool, automatically_determined >

Class template is_async_operation is a trait is derived from true_type if the expression T(Args..., token) initiates an asynchronous operation, where token is an unspecified completion token type. Otherwise, is_async_operation is derived from false_type.

Requirements

Header: asio/async_result.hpp

Convenience header: asio.hpp