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1 // -*- C++ -*-
3 // Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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 terms
7 // of the GNU General Public License as published by the Free Software
8 // Foundation; either version 2, or (at your option) any later
9 // version.
11 // This library is distributed in the hope that it will be useful, but
12 // WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // General Public License for more details.
16 // You should have received a copy of the GNU General Public License
17 // along with this library; see the file COPYING. If not, write to
18 // the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
19 // MA 02111-1307, USA.
21 // As a special exception, you may use this file as part of a free
22 // software library without restriction. Specifically, if other files
23 // instantiate templates or use macros or inline functions from this
24 // file, or you compile this file and link it with other files to
25 // produce an executable, this file does not by itself cause the
26 // resulting executable to be covered by the GNU General Public
27 // License. This exception does not however invalidate any other
28 // reasons why the executable file might be covered by the GNU General
29 // Public License.
31 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
33 // Permission to use, copy, modify, sell, and distribute this software
34 // is hereby granted without fee, provided that the above copyright
35 // notice appears in all copies, and that both that copyright notice
36 // and this permission notice appear in supporting documentation. None
37 // of the above authors, nor IBM Haifa Research Laboratories, make any
38 // representation about the suitability of this software for any
39 // purpose. It is provided "as is" without express or implied
40 // warranty.
42 /**
43 * @file split_join_fn_imps.hpp
44 * Contains an implementation class for splay_tree_.
47 PB_DS_CLASS_T_DEC
48 inline void
49 PB_DS_CLASS_C_DEC::
50 join(PB_DS_CLASS_C_DEC& other)
52 _GLIBCXX_DEBUG_ONLY(assert_valid();)
53 _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
54 if (base_type::join_prep(other) == false)
56 _GLIBCXX_DEBUG_ONLY(assert_valid();)
57 _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
58 return;
61 node_pointer p_target_r = other.leftmost(other.m_p_head);
62 _GLIBCXX_DEBUG_ASSERT(p_target_r != NULL);
63 other.splay(p_target_r);
65 _GLIBCXX_DEBUG_ASSERT(p_target_r == other.m_p_head->m_p_parent);
66 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left == NULL);
68 p_target_r->m_p_left = base_type::m_p_head->m_p_parent;
70 _GLIBCXX_DEBUG_ASSERT(p_target_r->m_p_left != NULL);
71 p_target_r->m_p_left->m_p_parent = p_target_r;
73 base_type::m_p_head->m_p_parent = p_target_r;
74 p_target_r->m_p_parent = base_type::m_p_head;
75 apply_update(p_target_r, (node_update* )this);
77 base_type::join_finish(other);
79 _GLIBCXX_DEBUG_ONLY(assert_valid();)
80 _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
83 PB_DS_CLASS_T_DEC
84 void
85 PB_DS_CLASS_C_DEC::
86 split(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)
88 _GLIBCXX_DEBUG_ONLY(assert_valid());
89 _GLIBCXX_DEBUG_ONLY(other.assert_valid());
91 if (base_type::split_prep(r_key, other) == false)
93 _GLIBCXX_DEBUG_ONLY(assert_valid());
94 _GLIBCXX_DEBUG_ONLY(other.assert_valid());
95 return;
98 node_pointer p_upper_bound = upper_bound(r_key).m_p_nd;
99 _GLIBCXX_DEBUG_ASSERT(p_upper_bound != NULL);
101 splay(p_upper_bound);
102 _GLIBCXX_DEBUG_ASSERT(p_upper_bound->m_p_parent == this->m_p_head);
104 node_pointer p_new_root = p_upper_bound->m_p_left;
105 _GLIBCXX_DEBUG_ASSERT(p_new_root != NULL);
107 base_type::m_p_head->m_p_parent = p_new_root;
108 p_new_root->m_p_parent = base_type::m_p_head;
109 other.m_p_head->m_p_parent = p_upper_bound;
110 p_upper_bound->m_p_parent = other.m_p_head;
111 p_upper_bound->m_p_left = NULL;
112 apply_update(p_upper_bound, (node_update* )this);
113 base_type::split_finish(other);
115 _GLIBCXX_DEBUG_ONLY(assert_valid());
116 _GLIBCXX_DEBUG_ONLY(other.assert_valid());