#include <iostream>
using namespace std;

struct short2
{
  short x;
  short y;
};

struct short3
{
  short x;
  short y;
  short z;
};

#define CREATE_MEMBER_DETECTOR(X)                                                   \
template<typename T> class Detect_##X {                                             \
    struct Fallback { int X; };                                                     \
    struct Derived : T, Fallback { };                                               \
                                                                                    \
    template<typename U, U> struct Check;                                           \
                                                                                    \
    typedef char ArrayOfOne[1];                                                     \
    typedef char ArrayOfTwo[2];                                                     \
                                                                                    \
    template<typename U> static ArrayOfOne & func(Check<int Fallback::*, &U::X> *); \
    template<typename U> static ArrayOfTwo & func(...);                             \
  public:                                                                           \
    typedef Detect_##X type;                                                        \
    enum { value = sizeof(func<Derived>(0)) == 2 };                                 \
};

CREATE_MEMBER_DETECTOR(x);
CREATE_MEMBER_DETECTOR(y);
CREATE_MEMBER_DETECTOR(z);

int main()
{
  std::cout << Detect_z<short2>::value << std::endl;
  std::cout << Detect_z<short3>::value << std::endl;
  return 0;
}