Function asio_handler_invoke

demo_example/asio/asio/impl/use_future.hpp:663–669

template <typename Function, typename Signature, typename Allocator>
inline void asio_handler_invoke(Function& f,
    promise_handler<Signature, Allocator>* h)
{
  typename promise_handler<Signature, Allocator>::executor_type
    ex(h->get_executor());
  asio::dispatch(ex, promise_function_wrapper<Function>(f));
}

template <typename Function, typename Signature, typename Allocator>
inline void asio_handler_invoke(const Function& f,