I have a function pointer to a member function in class. How do I initialize this function pointer since I get a warning on compilation every time. Here is the code:
//Node.h
class Node{
bool (Node::*strategyPointer)(const unsigned int&);
Node();
};
//Node.cpp
Node::Node(){
//How do I initialize my pointer here?
}
thanks
Firstly, you don't have any methods it could legally point to, so let's add some:
class Node{
bool (Node::*strategyPointer)(const unsigned int&);
bool firstStrategy(const unsigned int&) { return true; }
bool secondStrategy(const unsigned int&) { return false; }
public:
Node();
};
Now we have a valid value to initialize it with, just use:
Node::Node() : strategyPointer(&Node::firstStrategy) {}
firstStrategy or whatever method) and the error if you want us to help with them.I wouldn't initialize it to a particular function, better to assign it that function when you actually need it. Rather just initialize it to null:
Node::Node() : strategyPointer(nullptr)
{
}
This also lets you easily test whether strategyPointer has been used, by if (strategyPointer!=nullptr) or just if (strategyPointer).
Lastly, doing it this way allows you the option of having Node be an (abstract) base class which does not in fact possess any member functions of the right signature.
