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  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. namespace std
  35. {
  36.  
  37. template <class _T1, class _T2>
  38. struct pair {
  39.   typedef _T1 first_type;
  40.   typedef _T2 second_type;
  41.  
  42.   _T1 first;
  43.   _T2 second;
  44. #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
  45. //265.  std::pair::pair() effects overly restrictive
  46.   pair() : first(), second() {}
  47. #else
  48.   pair() : first(_T1()), second(_T2()) {}
  49. #endif
  50.   pair(const _T1& __a, const _T2& __b) : first(__a), second(__b) {}
  51.  
  52.   template <class _U1, class _U2>
  53.   pair(const pair<_U1, _U2>& __p) : first(__p.first), second(__p.second) {}
  54. };
  55.  
  56. template <class _T1, class _T2>
  57. inline bool operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
  58. {
  59.   return __x.first == __y.first && __x.second == __y.second;
  60. }
  61.  
  62. template <class _T1, class _T2>
  63. inline bool operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
  64. {
  65.   return __x.first < __y.first ||
  66.          (!(__y.first < __x.first) && __x.second < __y.second);
  67. }
  68.  
  69. template <class _T1, class _T2>
  70. inline bool operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
  71.   return !(__x == __y);
  72. }
  73.  
  74. template <class _T1, class _T2>
  75. inline bool operator>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
  76.   return __y < __x;
  77. }
  78.  
  79. template <class _T1, class _T2>
  80. inline bool operator<=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
  81.   return !(__y < __x);
  82. }
  83.  
  84. template <class _T1, class _T2>
  85. inline bool operator>=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y) {
  86.   return !(__x < __y);
  87. }
  88.  
  89. template <class _T1, class _T2>
  90. #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
  91. //181.  make_pair() unintended behavior
  92. inline pair<_T1, _T2> make_pair(_T1 __x, _T2 __y)
  93. #else
  94. inline pair<_T1, _T2> make_pair(const _T1& __x, const _T2& __y)
  95. #endif
  96. {
  97.   return pair<_T1, _T2>(__x, __y);
  98. }
  99.  
  100. } // namespace std
  101.  
  102. #endif /* __SGI_STL_INTERNAL_PAIR_H */
  103.  
  104. // Local Variables:
  105. // mode:C++
  106. // End:
  107.