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Diffstat (limited to 'libstdc++/src/list.cc')
| -rw-r--r-- | libstdc++/src/list.cc | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/libstdc++/src/list.cc b/libstdc++/src/list.cc new file mode 100644 index 0000000..fe68ba1 --- /dev/null +++ b/libstdc++/src/list.cc @@ -0,0 +1,141 @@ +// std::list utilities implementation -*- C++ -*- + +// Copyright (C) 2003, 2005 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 2, 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. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +/* + * + * Copyright (c) 1994 + * Hewlett-Packard Company + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Hewlett-Packard Company makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + * + * + * Copyright (c) 1996,1997 + * Silicon Graphics Computer Systems, Inc. + * + * Permission to use, copy, modify, distribute and sell this software + * and its documentation for any purpose is hereby granted without fee, + * provided that the above copyright notice appear in all copies and + * that both that copyright notice and this permission notice appear + * in supporting documentation. Silicon Graphics makes no + * representations about the suitability of this software for any + * purpose. It is provided "as is" without express or implied warranty. + */ + +#include <list> + +_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD) + + void + _List_node_base::swap(_List_node_base& __x, _List_node_base& __y) + { + 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) + { + 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() + { + _List_node_base* __tmp = this; + do + { + std::swap(__tmp->_M_next, __tmp->_M_prev); + __tmp = __tmp->_M_prev; // Old next node is now prev. + } + while (__tmp != this); + } + + void + _List_node_base::hook(_List_node_base* const __position) + { + 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() + { + _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_NESTED_NAMESPACE |
