C++: Calling member function via pointer

Question

I have this example code of using pointer to member function, which I want to change during runtime, but I cannot make it work. I\'ve already tried this->*_currentP

Answer 1

You need to tell the compiler which class the foos are coming from (otherwise it thinks they're functions from global scope):

void A::setPtr(int v){
    if(v == 1){
        _currentPtr = &A::foo1;
                  //  ^^^^
    } else {
        _currentPtr = &A::foo2;
                  //  ^^^^
    }
}

and you need a set of parentheses here:

std::cout << (this->*_currentPtr)(4,5);
          // ^                  ^