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1 | // std::list utilities implementation -*- C++ -*- |
2 | ||
a945c346 | 3 | // Copyright (C) 2003-2024 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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9 | // any later version. |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
748086b7 JJ |
16 | // Under Section 7 of GPL version 3, you are granted additional |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
e135a038 | 19 | |
748086b7 JJ |
20 | // You should have received a copy of the GNU General Public License and |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
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24 | |
25 | /* | |
26 | * | |
27 | * Copyright (c) 1994 | |
28 | * Hewlett-Packard Company | |
29 | * | |
30 | * Permission to use, copy, modify, distribute and sell this software | |
31 | * and its documentation for any purpose is hereby granted without fee, | |
32 | * provided that the above copyright notice appear in all copies and | |
33 | * that both that copyright notice and this permission notice appear | |
34 | * in supporting documentation. Hewlett-Packard Company makes no | |
35 | * representations about the suitability of this software for any | |
36 | * purpose. It is provided "as is" without express or implied warranty. | |
37 | * | |
38 | * | |
39 | * Copyright (c) 1996,1997 | |
40 | * Silicon Graphics Computer Systems, Inc. | |
41 | * | |
42 | * Permission to use, copy, modify, distribute and sell this software | |
43 | * and its documentation for any purpose is hereby granted without fee, | |
44 | * provided that the above copyright notice appear in all copies and | |
45 | * that both that copyright notice and this permission notice appear | |
46 | * in supporting documentation. Silicon Graphics makes no | |
47 | * representations about the suitability of this software for any | |
48 | * purpose. It is provided "as is" without express or implied warranty. | |
49 | */ | |
50 | ||
51 | #include <list> | |
52 | ||
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53 | namespace std _GLIBCXX_VISIBILITY(default) |
54 | { | |
4a15d842 FD |
55 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
56 | ||
12ffa228 | 57 | namespace __detail |
e135a038 | 58 | { |
12ffa228 | 59 | void |
d3677132 PC |
60 | _List_node_base::swap(_List_node_base& __x, |
61 | _List_node_base& __y) _GLIBCXX_USE_NOEXCEPT | |
e135a038 | 62 | { |
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63 | if ( __x._M_next != &__x ) |
64 | { | |
65 | if ( __y._M_next != &__y ) | |
66 | { | |
67 | // Both __x and __y are not empty. | |
68 | std::swap(__x._M_next,__y._M_next); | |
69 | std::swap(__x._M_prev,__y._M_prev); | |
70 | __x._M_next->_M_prev = __x._M_prev->_M_next = &__x; | |
71 | __y._M_next->_M_prev = __y._M_prev->_M_next = &__y; | |
72 | } | |
73 | else | |
74 | { | |
75 | // __x is not empty, __y is empty. | |
76 | __y._M_next = __x._M_next; | |
77 | __y._M_prev = __x._M_prev; | |
78 | __y._M_next->_M_prev = __y._M_prev->_M_next = &__y; | |
79 | __x._M_next = __x._M_prev = &__x; | |
80 | } | |
81 | } | |
82 | else if ( __y._M_next != &__y ) | |
83 | { | |
84 | // __x is empty, __y is not empty. | |
85 | __x._M_next = __y._M_next; | |
86 | __x._M_prev = __y._M_prev; | |
87 | __x._M_next->_M_prev = __x._M_prev->_M_next = &__x; | |
88 | __y._M_next = __y._M_prev = &__y; | |
89 | } | |
e135a038 | 90 | } |
e135a038 | 91 | |
12ffa228 | 92 | void |
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93 | _List_node_base:: |
94 | _M_transfer(_List_node_base * const __first, | |
95 | _List_node_base * const __last) _GLIBCXX_USE_NOEXCEPT | |
e135a038 | 96 | { |
ff7793be JW |
97 | __glibcxx_assert(__first != __last); |
98 | ||
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99 | if (this != __last) |
100 | { | |
101 | // Remove [first, last) from its old position. | |
102 | __last->_M_prev->_M_next = this; | |
103 | __first->_M_prev->_M_next = __last; | |
104 | this->_M_prev->_M_next = __first; | |
105 | ||
106 | // Splice [first, last) into its new position. | |
107 | _List_node_base* const __tmp = this->_M_prev; | |
108 | this->_M_prev = __last->_M_prev; | |
109 | __last->_M_prev = __first->_M_prev; | |
110 | __first->_M_prev = __tmp; | |
111 | } | |
e135a038 | 112 | } |
e135a038 | 113 | |
12ffa228 | 114 | void |
d3677132 | 115 | _List_node_base::_M_reverse() _GLIBCXX_USE_NOEXCEPT |
e135a038 | 116 | { |
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117 | _List_node_base* __tmp = this; |
118 | do | |
119 | { | |
120 | std::swap(__tmp->_M_next, __tmp->_M_prev); | |
bd1a56a0 | 121 | |
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122 | // Old next node is now prev. |
123 | __tmp = __tmp->_M_prev; | |
124 | } | |
125 | while (__tmp != this); | |
126 | } | |
e135a038 | 127 | |
12ffa228 | 128 | void |
d3677132 PC |
129 | _List_node_base:: |
130 | _M_hook(_List_node_base* const __position) _GLIBCXX_USE_NOEXCEPT | |
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131 | { |
132 | this->_M_next = __position; | |
133 | this->_M_prev = __position->_M_prev; | |
134 | __position->_M_prev->_M_next = this; | |
135 | __position->_M_prev = this; | |
136 | } | |
e135a038 | 137 | |
12ffa228 | 138 | void |
d3677132 | 139 | _List_node_base::_M_unhook() _GLIBCXX_USE_NOEXCEPT |
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140 | { |
141 | _List_node_base* const __next_node = this->_M_next; | |
142 | _List_node_base* const __prev_node = this->_M_prev; | |
143 | __prev_node->_M_next = __next_node; | |
144 | __next_node->_M_prev = __prev_node; | |
145 | } | |
12ffa228 | 146 | } // namespace __detail |
4a15d842 FD |
147 | |
148 | _GLIBCXX_END_NAMESPACE_VERSION | |
12ffa228 | 149 | } // namespace std |