Question

Let’s assume mf_ptr is a typedef of member function pointer of a class. And we have the flowing code:

map<string, mb_ptr> cmd_table;
cmd_table["exit"] = &class_name::exit;
string cmd;
while (cin >> cmd){
    (this->*cmd_table[cmd])();
}

So how should i define the function exit() to exit the while loop?

Answer 1

You have a few options:

1. Raise an exception in the exit function, and catch it in the while loop.

2. Have all your functions return a boolean, whether or not to exit the while loop.