std::map of member function pointers?

Question

I need to implement an std::map with pairs. The function pointers are pointers to methods of the same class that owns t

Answer 1

Another option is to use delegates as oppose to function pointers. This delegate implementation is pretty fast, supports polymorphisms, and plays well with stl containers. You could have something like:

class MyClass {
public:
    // defines
    typedef fastdelegate::FastDelegate2 MyDelegate;
    typedef std::map MyMap;

    // populate your map of delegates
    MyClass() {
        _myMap["plus"] = fastdelegate::MakeDelegate(this, &Plus);
        _myMap["minus"] = fastdelegate::MakeDelegate(this, &Minus);
    }

    bool Do(const std::string& operation, int a, int b, int& res){
        MyMap::const_iterator it = _myMap.find(operation);
        if (it != _myMap.end()){
            res = it.second(a,b);
            return true;
        }

        return false; 
    }
private:
    int Plus (int a, int b) { return a+b; }
    int Minus(int a, int b) { return a-b; }
    MyMap _myMap;    
};