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// { dg-options "-std=gnu++0x" }

// { dg-do run }

// A basic implementation of TR1's mem_fn using variadic teplates

// Contributed by Douglas Gregor 

#include 

template

class Mem_fn

{

 public:

  explicit Mem_fn(R (Class::*pmf)(Args...)) : pmf(pmf) { }

  R operator()(Class& object, Args... args)

  {

    return (object.*pmf)(args...);

  }

  R operator()(Class* object, Args... args)

  {

    return (object->*pmf)(args...);

  }

  R (Class::*pmf)(Args...);

};

template

inline Mem_fn

mem_fn(R (Class::* pmf)(Args...))

{

  return Mem_fn(pmf);

}

class X {

 public:

  int negate(int x) { return -x; }

  int plus(int x, int y) { return x + y; }

};

int main()

{

  X x;

  X* xp = &x;

  assert(mem_fn(&X::negate)(x, 17) == -17);

  assert(mem_fn(&X::negate)(xp, 17) == -17);

  assert(mem_fn(&X::plus)(x, 17, 25) == 42);

  assert(mem_fn(&X::plus)(xp, 17, 25) == 42);

  return 0;

}