<utility>

Library:  General utilities

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The header <utility> is part of the General utilities library of the C++ Standard Library. It defines the class template pair, a helper function template make_pair(), a set of relational operators that C++ programs may use to perform equality and inequality tests on specializations of pair, and, in the namespace rel_ops, the function templates operator!=(), operator>(), operator<=(), and operator>=().

namespace std {
  namespace rel_ops {
    template<class T> bool operator!=(const T&, const T&);
    template<class T> bool operator> (const T&, const T&);
    template<class T> bool operator<=(const T&, const T&);
    template<class T> bool operator>=(const T&, const T&);
  }

  template <class T1, class T2> 
  struct pair;
  template <class T1, class T2>
  bool operator==(const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2>
  bool operator< (const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2>
  bool operator!=(const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2>
  bool operator> (const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2>
  bool operator>=(const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2>
  bool operator<=(const pair<T1, T2>&, const pair<T1, T2>&);
  template <class T1, class T2> pair<T1, T2>
  make_pair (const T1&, const T2&);
}

pair, Operators

ISO/IEC 14882:1998 -- International Standard for Information Systems --Programming Language C++, Section 20.2