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1 | // std::list utilities implementation -*- C++ -*- |
2 | ||
3cbc7af0 | 3 | // Copyright (C) 2003, 2005 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 | |
8 | // Free Software Foundation; either version 2, or (at your option) | |
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 | ||
16 | // You should have received a copy of the GNU General Public License along | |
17 | // with this library; see the file COPYING. If not, write to the Free | |
83f51799 | 18 | // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
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19 | // USA. |
20 | ||
21 | // As a special exception, you may use this file as part of a free software | |
22 | // library without restriction. Specifically, if other files instantiate | |
23 | // templates or use macros or inline functions from this file, or you compile | |
24 | // this file and link it with other files to produce an executable, this | |
25 | // file does not by itself cause the resulting executable to be covered by | |
26 | // the GNU General Public License. This exception does not however | |
27 | // invalidate any other reasons why the executable file might be covered by | |
28 | // the GNU General Public License. | |
29 | ||
30 | /* | |
31 | * | |
32 | * Copyright (c) 1994 | |
33 | * Hewlett-Packard Company | |
34 | * | |
35 | * Permission to use, copy, modify, distribute and sell this software | |
36 | * and its documentation for any purpose is hereby granted without fee, | |
37 | * provided that the above copyright notice appear in all copies and | |
38 | * that both that copyright notice and this permission notice appear | |
39 | * in supporting documentation. Hewlett-Packard Company makes no | |
40 | * representations about the suitability of this software for any | |
41 | * purpose. It is provided "as is" without express or implied warranty. | |
42 | * | |
43 | * | |
44 | * Copyright (c) 1996,1997 | |
45 | * Silicon Graphics Computer Systems, Inc. | |
46 | * | |
47 | * Permission to use, copy, modify, distribute and sell this software | |
48 | * and its documentation for any purpose is hereby granted without fee, | |
49 | * provided that the above copyright notice appear in all copies and | |
50 | * that both that copyright notice and this permission notice appear | |
51 | * in supporting documentation. Silicon Graphics makes no | |
52 | * representations about the suitability of this software for any | |
53 | * purpose. It is provided "as is" without express or implied warranty. | |
54 | */ | |
55 | ||
56 | #include <list> | |
57 | ||
c2ba9709 | 58 | _GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD_D) |
3cbc7af0 | 59 | |
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60 | void |
61 | _List_node_base::swap(_List_node_base& __x, _List_node_base& __y) | |
62 | { | |
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 | } | |
90 | } | |
91 | ||
92 | void | |
93 | _List_node_base::transfer(_List_node_base * const __first, | |
94 | _List_node_base * const __last) | |
95 | { | |
96 | if (this != __last) | |
97 | { | |
98 | // Remove [first, last) from its old position. | |
99 | __last->_M_prev->_M_next = this; | |
100 | __first->_M_prev->_M_next = __last; | |
101 | this->_M_prev->_M_next = __first; | |
102 | ||
103 | // Splice [first, last) into its new position. | |
104 | _List_node_base* const __tmp = this->_M_prev; | |
105 | this->_M_prev = __last->_M_prev; | |
106 | __last->_M_prev = __first->_M_prev; | |
107 | __first->_M_prev = __tmp; | |
108 | } | |
109 | } | |
110 | ||
111 | void | |
112 | _List_node_base::reverse() | |
113 | { | |
114 | _List_node_base* __tmp = this; | |
115 | do | |
116 | { | |
117 | std::swap(__tmp->_M_next, __tmp->_M_prev); | |
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118 | |
119 | // Old next node is now prev. | |
120 | __tmp = __tmp->_M_prev; | |
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121 | } |
122 | while (__tmp != this); | |
123 | } | |
124 | ||
125 | void | |
390e4c0d | 126 | _List_node_base::hook(_List_node_base* const __position) |
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127 | { |
128 | this->_M_next = __position; | |
129 | this->_M_prev = __position->_M_prev; | |
130 | __position->_M_prev->_M_next = this; | |
131 | __position->_M_prev = this; | |
132 | } | |
133 | ||
134 | void | |
135 | _List_node_base::unhook() | |
136 | { | |
137 | _List_node_base* const __next_node = this->_M_next; | |
138 | _List_node_base* const __prev_node = this->_M_prev; | |
139 | __prev_node->_M_next = __next_node; | |
140 | __next_node->_M_prev = __prev_node; | |
141 | } | |
e135a038 | 142 | |
3cbc7af0 | 143 | _GLIBCXX_END_NESTED_NAMESPACE |