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);
}