Method on_connection_error

cpp/src/handler.cpp:53–53

void messaging_handler::on_connection_close(connection &) {}
void messaging_handler::on_connection_error(connection &c) { on_error(c.error()); }
void messaging_handler::on_connection_open(connection &c) {
    if (c.uninitialized()) {
        pn_connection_open(unwrap(c));