More painful

#include <bits/stdc++.h>

using namespace std;

class DelegateClass {
public:
    void print();
};

void DelegateClass::print() {
    cout << __func__ << endl;
}

template<class DT>
class Main {
private:
    void (DT::*_delegateFunction)();
    DT* _delegateInstance;
public:
    void connectToDelegate(DT*, void (DT::*)());
    void run();
};

template<class DT>
void Main<DT>::run() {
    (_delegateInstance->*_delegateFunction)();
}

template<class DT>
void Main<DT>::connectToDelegate(DT* delegateInstance,
        void (DT::*delegateFunction)())
{
    _delegateFunction = delegateFunction;
    _delegateInstance = delegateInstance;
}

int main() {
    DelegateClass d;
    Main<DelegateClass> c;
    c.connectToDelegate(&d, &DelegateClass::print);
    c.run();
}