I'd probably do it like this: socks5_socket([&](auto closed_socket) { closed_socket.connect_unauthenticated(proxy_addr, [&](auto authenticated_socket)

I'd probably do it like this: socks5_socket([&](auto closed_socket) { closed_socket.connect_unauthenticated(proxy_addr, [&](auto authenticated_socket) { authenticated_socket.connect_tcp(addr, [&](auto tcp_socket) { //tcp_socket.send or w/e }); }); });