libstdc++-v3/include/bits/stl_stack.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_STACK_H
  32 #define __SGI_STL_INTERNAL_STACK_H
  33
  34 #include <bits/concept_check.h>
  35
  36 namespace std
  37 {
  38
  39 // Forward declarations of operators == and <, needed for friend declaration.
  40
  41 template <class _Tp,
  42           class _Sequence = deque<_Tp> >
  43 class stack;
  44
  45 template <class _Tp, class _Seq>
  46 bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
  47
  48 template <class _Tp, class _Seq>
  49 bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y);
  50
  51
  52 template <class _Tp, class _Sequence>
  53 class stack
  54 {
  55   // concept requirements
  56   __glibcpp_class_requires(_Tp, _SGIAssignableConcept);
  57   __glibcpp_class_requires(_Sequence, _BackInsertionSequenceConcept);
  58   typedef typename _Sequence::value_type _Sequence_value_type;
  59   __glibcpp_class_requires2(_Tp, _Sequence_value_type, _SameTypeConcept);
  60
  61   template <class _Tp1, class _Seq1>
  62   friend bool operator== (const stack<_Tp1, _Seq1>&,
  63                           const stack<_Tp1, _Seq1>&);
  64   template <class _Tp1, class _Seq1>
  65   friend bool operator< (const stack<_Tp1, _Seq1>&,
  66                          const stack<_Tp1, _Seq1>&);
  67 public:
  68   typedef typename _Sequence::value_type      value_type;
  69   typedef typename _Sequence::size_type       size_type;
  70   typedef          _Sequence                  container_type;
  71
  72   typedef typename _Sequence::reference       reference;
  73   typedef typename _Sequence::const_reference const_reference;
  74 protected:
  75   _Sequence c;
  76 public:
  77   stack() : c() {}
  78   explicit stack(const _Sequence& __s) : c(__s) {}
  79
  80   bool empty() const { return c.empty(); }
  81   size_type size() const { return c.size(); }
  82   reference top() { return c.back(); }
  83   const_reference top() const { return c.back(); }
  84   void push(const value_type& __x) { c.push_back(__x); }
  85   void pop() { c.pop_back(); }
  86 };
  87
  88 template <class _Tp, class _Seq>
  89 bool operator==(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
  90 {
  91   return __x.c == __y.c;
  92 }
  93
  94 template <class _Tp, class _Seq>
  95 bool operator<(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
  96 {
  97   return __x.c < __y.c;
  98 }
  99
 100 template <class _Tp, class _Seq>
 101 bool operator!=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
 102 {
 103   return !(__x == __y);
 104 }
 105
 106 template <class _Tp, class _Seq>
 107 bool operator>(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
 108 {
 109   return __y < __x;
 110 }
 111
 112 template <class _Tp, class _Seq>
 113 bool operator<=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
 114 {
 115   return !(__y < __x);
 116 }
 117
 118 template <class _Tp, class _Seq>
 119 bool operator>=(const stack<_Tp,_Seq>& __x, const stack<_Tp,_Seq>& __y)
 120 {
 121   return !(__x < __y);
 122 }
 123
 124 } // namespace std
 125
 126 #endif /* __SGI_STL_INTERNAL_STACK_H */
 127
 128 // Local Variables:
 129 // mode:C++
 130 // End: