headers/cpp/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) 1996,1997
  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 /* NOTE: This is an internal header file, included by other STL headers.
  28  *   You should not attempt to use it directly.
  29  */
  30
  31 #ifndef __SGI_STL_INTERNAL_PAIR_H
  32 #define __SGI_STL_INTERNAL_PAIR_H
  33
  34 __STL_BEGIN_NAMESPACE
  35
  36 template <class _T1, class _T2>
  37 struct pair {
  38   typedef _T1 first_type;
  39   typedef _T2 second_type;
  40
  41   _T1 first;
  42   _T2 second;
  43   pair() : first(_T1()), second(_T2()) {}
  44   pair(const _T1& __a, const _T2& __b) : first(__a), second(__b) {}
  45
  46 #ifdef __STL_MEMBER_TEMPLATES
  47   template <class _U1, class _U2>
  48   pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {}
  49 #endif
  50 };
  51
  52 template <class _T1, class _T2>
  53 inline bool operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
  54 {
  55   return __x.first == __y.first && __x.second == __y.second;
  56 }
  57
  58 template <class _T1, class _T2>
  59 inline bool operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
  60 {
  61   return __x.first < __y.first ||
  62          (!(__y.first < __x.first) && __x.second < __y.second);
  63 }
  64
  65 template <class _T1, class _T2>
  66 inline pair<_T1, _T2> make_pair(const _T1& __x, const _T2& __y)
  67 {
  68   return pair<_T1, _T2>(__x, __y);
  69 }
  70
  71 __STL_END_NAMESPACE
  72
  73 #endif /* __SGI_STL_INTERNAL_PAIR_H */
  74
  75 // Local Variables:
  76 // mode:C++
  77 // End: