File: main.cpp

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struct A
{
  int i;
  int func(){return i;}
};

struct B
{
  A* pa;
  int (A::* pmethod)();
        B(A* pa, int (A::* pmethod)()):pa(pa), pmethod(pmethod) {}
  int eval(){return (pa->*pmethod)();}
};

int main()
{
  A a;
  B b(&a, &A::func);
  assert(b.eval() == a.i);
}