summaryrefslogtreecommitdiff
path: root/libstdc++-v3/src/compatibility-list.cc
blob: a0d706b27a91dd71fe95c109150686ab66185940 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// Compatibility symbols for previous versions, list bits -*- C++ -*-

// Copyright (C) 2010, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

#include <bits/move.h>

#ifndef _GLIBCXX_BEGIN_NAMESPACE_COMPAT
# define _GLIBCXX_BEGIN_NAMESPACE_COMPAT
#endif

#ifndef _GLIBCXX_END_NAMESPACE_COMPAT
# define _GLIBCXX_END_NAMESPACE_COMPAT
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_COMPAT

  struct _List_node_base
  {
    _List_node_base* _M_next;
    _List_node_base* _M_prev;

    static void
    swap(_List_node_base& __x, _List_node_base& __y) throw ();

    void
    transfer(_List_node_base * const __first,
	     _List_node_base * const __last) throw ();

    void
    reverse() throw ();

    void
    hook(_List_node_base * const __position) throw ();

    void
    unhook() throw ();
  };

  void
  _List_node_base::swap(_List_node_base& __x, _List_node_base& __y) throw()
  {
    if ( __x._M_next != &__x )
      {
	if ( __y._M_next != &__y )
	  {
	    // Both __x and __y are not empty.
	    std::swap(__x._M_next,__y._M_next);
	    std::swap(__x._M_prev,__y._M_prev);
	    __x._M_next->_M_prev = __x._M_prev->_M_next = &__x;
	    __y._M_next->_M_prev = __y._M_prev->_M_next = &__y;
	  }
	else
	  {
	    // __x is not empty, __y is empty.
	    __y._M_next = __x._M_next;
	    __y._M_prev = __x._M_prev;
	    __y._M_next->_M_prev = __y._M_prev->_M_next = &__y;
	    __x._M_next = __x._M_prev = &__x;
	  }
      }
    else if ( __y._M_next != &__y )
      {
	// __x is empty, __y is not empty.
	__x._M_next = __y._M_next;
	__x._M_prev = __y._M_prev;
	__x._M_next->_M_prev = __x._M_prev->_M_next = &__x;
	__y._M_next = __y._M_prev = &__y;
      }
  }

  void
  _List_node_base::transfer(_List_node_base * const __first,
			    _List_node_base * const __last) throw ()
  {
    if (this != __last)
    {
      // Remove [first, last) from its old position.
      __last->_M_prev->_M_next  = this;
      __first->_M_prev->_M_next = __last;
      this->_M_prev->_M_next    = __first;

      // Splice [first, last) into its new position.
      _List_node_base* const __tmp = this->_M_prev;
      this->_M_prev                = __last->_M_prev;
      __last->_M_prev              = __first->_M_prev;
      __first->_M_prev             = __tmp;
    }
  }

  void
  _List_node_base::reverse() throw ()
  {
    _List_node_base* __tmp = this;
    do
    {
      std::swap(__tmp->_M_next, __tmp->_M_prev);

      // Old next node is now prev.
      __tmp = __tmp->_M_prev;
    }
    while (__tmp != this);
  }

  void
  _List_node_base::hook(_List_node_base* const __position) throw ()
  {
    this->_M_next = __position;
    this->_M_prev = __position->_M_prev;
    __position->_M_prev->_M_next = this;
    __position->_M_prev = this;
  }

  void
  _List_node_base::unhook() throw ()
  {
    _List_node_base* const __next_node = this->_M_next;
    _List_node_base* const __prev_node = this->_M_prev;
    __prev_node->_M_next = __next_node;
    __next_node->_M_prev = __prev_node;
  }

_GLIBCXX_END_NAMESPACE_COMPAT

} // namespace std