1 #ifndef __PRIVATE_CONSTRUCTOR__H 2 #define __PRIVATE_CONSTRUCTOR__H 3 4 #include <iostream> 5 6 struct PrivateConstructor { 7 8 PrivateConstructor static make ( int v ) { return PrivateConstructor(v); } 9 int get () const { return val; } 10 private: 11 PrivateConstructor ( int v ) : val(v) {} 12 int val; 13 }; 14 15 bool operator < ( const PrivateConstructor &lhs, const PrivateConstructor &rhs ) { return lhs.get() < rhs.get(); } 16 17 bool operator < ( const PrivateConstructor &lhs, int rhs ) { return lhs.get() < rhs; } 18 bool operator < ( int lhs, const PrivateConstructor &rhs ) { return lhs < rhs.get(); } 19 20 std::ostream & operator << ( std::ostream &os, const PrivateConstructor &foo ) { return os << foo.get (); } 21 22 #endif 23