Method is_writable

examples/server/httplib.h:5019–5022

}

inline bool SocketStream::is_writable() const {
  return select_write(sock_, write_timeout_sec_, write_timeout_usec_) > 0 &&
         is_socket_alive(sock_);
}

inline ssize_t SocketStream::read(char *ptr, size_t size) {
#ifdef _WIN32