Boost.Asio c++ 网络编程翻译（23）
void start() {
...
do_read(); // first, we wait for client to login
}
void on_read(const error_code & err, size_t bytes) {
std::string msg(read_buffer_, bytes);
if ( msg.find("login ") == 0) on_login(msg);
else if ( msg.find("ping") == 0) on_ping();
else ... }
void on_login(const std::string & msg) {
std::istringstream in(msg);
in >> username_ >> username_;
do_write("login ok\n");
}
void do_write(const std::string & msg) {
std::copy(msg.begin(), msg.end(), write_buffer_);
sock_.async_write_some( buffer(write_buffer_, msg.size()),
MEM_FN2(on_write,_1,_2));
}
void on_write(const error_code & err, size_t bytes) {
do_read(); }