libstdc++/stl/pair.h

   1 /*
   2  *
   3  * Copyright (c) 1994
   4  * Hewlett-Packard Company
   5  *
   6  * Permission to use, copy, modify, distribute and sell this software
   7  * and its documentation for any purpose is hereby granted without fee,
   8  * provided that the above copyright notice appear in all copies and
   9  * that both that copyright notice and this permission notice appear
  10  * in supporting documentation.  Hewlett-Packard Company makes no
  11  * representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  *
  15  * Copyright (c) 1996
  16  * Silicon Graphics Computer Systems, Inc.
  17  *
  18  * Permission to use, copy, modify, distribute and sell this software
  19  * and its documentation for any purpose is hereby granted without fee,
  20  * provided that the above copyright notice appear in all copies and
  21  * that both that copyright notice and this permission notice appear
  22  * in supporting documentation.  Silicon Graphics makes no
  23  * representations about the suitability of this software for any
  24  * purpose.  It is provided "as is" without express or implied warranty.
  25  */
  26
  27 #ifndef PAIR_H
  28 #define PAIR_H
  29
  30 #include <stl_config.h>
  31
  32 template <class T1, class T2>
  33 struct pair {
  34     typedef T1 first_type;
  35     typedef T2 second_type;
  36
  37     T1 first;
  38     T2 second;
  39     pair() : first(T1()), second(T2()) {}
  40     pair(const T1& a, const T2& b) : first(a), second(b) {}
  41
  42 #ifdef __STL_MEMBER_TEMPLATES
  43     template <class U1, class U2>
  44     pair(const pair<U1, U2>& p) : first(p.first), second(p.second) {}
  45 #endif
  46 };
  47
  48 template <class T1, class T2>
  49 inline bool operator==(const pair<T1, T2>& x, const pair<T1, T2>& y) {
  50     return x.first == y.first && x.second == y.second;
  51 }
  52
  53 template <class T1, class T2>
  54 inline bool operator<(const pair<T1, T2>& x, const pair<T1, T2>& y) {
  55     return x.first < y.first || (!(y.first < x.first) && x.second < y.second);
  56 }
  57
  58 template <class T1, class T2>
  59 inline pair<T1, T2> make_pair(const T1& x, const T2& y) {
  60     return pair<T1, T2>(x, y);
  61 }
  62
  63 #endif