http://madebyevan.com/obscure-cpp-features/

 

#include <iostream>
using namespace std;

struct Test {
  int num;
  void func() {}
};

// Notice the extra "Test::" in the pointer type
int Test::*ptr_num = &Test::num;
void (Test::*ptr_func)() = &Test::func;

int main() {
  Test t;
  Test *pt = new Test;

  // Call the stored member function
  (t.*ptr_func)();
  (pt->*ptr_func)();

  // Set the variable in the stored member slot
  t.*ptr_num = 1;
  pt->*ptr_num = 2;

  delete pt;
  return 0;
}

 

#include <iostream>

namespace __hidden__ {
  struct print {
    bool space;
    print() : space(false) {}
    ~print() { std::cout << std::endl; }

    template <typename T>
    print &operator , (const T &t) {
      if (space) std::cout << ' ';
      else space = true;
      std::cout << t;
      return *this;
    }
  };
}

#define print __hidden__::print(),

int main() {
  int a = 1, b = 2;
  print "this is a test";
  print "the sum of", a, "and", b, "is", a + b;
  return 0;
}

 

 

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