C++ How to pass member function pointer to another class?

Question

Here is what I want to realize:

class Delegate
{
public:
    void SetFunction(void(*fun)());
private:
    void(*mEventFunction)();
}

Then i

Answer 1

You should pass &Test::OnEventStarted, this is the right syntax for a member function pointer

And after that, you'll have to get an instance of the Test class to run the function like this

instanceOfTest->*mEventFunction()

Answer 2

In order to call a member function, you need both pointer to member function and the object. However, given that member function type actually includes the class containting the function (in your example, it would be void (Test:: *mEventFunction)(); and would work with Test members only, the better solution is to use std::function. This is how it would look like:

class Delegate {
public:
    void SetFunction(std::function<void ()> fn) { mEventFunction = fn);
private:
    std::function<void ()> fn;
}

Test::Test() {
    Delegate testClass; // No need for dynamic allocation
    testClass->SetFunction(std::bind(&Test::OnEventStarted, this));
}