How to check if socket is closed in Boost.Asio?

Question

What is the easiest way to check if a socket was closed on the remote side of the connection? socket::is_open() returns true even if it is closed on the remote

Answer 1

Using error_code is able to check the condition whether the client is connected or not. If the connection is success, the error_code error.value() will return 0, else return other value. You can also check the message() from the error_code.