|  | Home | Libraries | People | FAQ | More | 
        Determine if T has the get_executor member function.
      
        Defined in header <boost/beast/core/stream_traits.hpp>
      
template< class T> using has_get_executor = see-below;
        Metafunctions are used to perform compile time checking of template types.
        This type will be std::true_type if T
        has the member function with the correct signature, else type will be std::false_type.
      
Use with tag dispatching:
template<class T> void maybe_hello(T const& t, std::true_type) { net::post( t.get_executor(), [] { std::cout << "Hello, world!" << std::endl; }); } template<class T> void maybe_hello(T const&, std::false_type) { // T does not have get_executor } template<class T> void maybe_hello(T const& t) { maybe_hello(t, has_get_executor<T>{}); }
        Use with static_assert:
      
struct stream { using executor_type = net::io_context::executor_type; executor_type get_executor() noexcept; }; static_assert(has_get_executor<stream>::value, "Missing get_executor member");