Listing 1: The Header <utility>

// utility standard header
#ifndef _UTILITY_
#define _UTILITY_
#include <iosfwd>
///namespace std {
		// TEMPLATE STRUCT pair
template<class T1, class T2> struct pair {
	pair()
		: first(T1()), second(T2()) {}
	pair(const T1& val1, const T2& val2)
		: first(val1), second(val2) {}
	T1 first;
	T2 second;
	};
		// TEMPLATE FUNCTION make_pair
template<class T1, class T2> inline
	pair<T1, T2> make_pair(const T1& x, const T2& y)
	{return (pair<T1, T2>(x, y)); }
		// pair TEMPLATE OPERATORS
template<class T1, class T2> inline
	bool operator==(const pair<T1, T2>& x,
		const pair<T1, T2>& y)
	{return (x.first == y.first && x.second == y.second); }
template<class T1, class T2> inline
	bool operator<(const pair<T1, T2>& x,
		const pair<T1, T2>& y)
	{return (x.first < y.first ||
		!(y.first < x.first) && x.second < y.second); }
		// TEMPLATE OPERATORS
template<class T> inline
	bool operator!=(const T& x, const T& y)
	{return (!(x == y)); }
template<class T> inline
	bool operator>(const T& x, const T& y)
	{return (y < x); }
template<class T> inline
	bool operator<=(const T& x, const T& y)
	{return (!(y < x)); }
template<class T> inline
	bool operator>=(const T& x, const T& y)
	{return (!(x < y)); }
///};	// end of namespace std
#endif /* _UTILITY_ */