libstdc++

ov_tree_map_/split_join_fn_imps.hpp
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1 // -*- C++ -*-
2
3 // Copyright (C) 2005-2013 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 3, or (at your option) any later
9 // version.
10
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.
15
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.
19
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/>.
24
25 // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
26
27 // Permission to use, copy, modify, sell, and distribute this software
28 // is hereby granted without fee, provided that the above copyright
29 // notice appears in all copies, and that both that copyright notice
30 // and this permission notice appear in supporting documentation. None
31 // of the above authors, nor IBM Haifa Research Laboratories, make any
32 // representation about the suitability of this software for any
33 // purpose. It is provided "as is" without express or implied
34 // warranty.
35
36 /**
37 * @file ov_tree_map_/split_join_fn_imps.hpp
38 * Contains an implementation class for ov_tree_.
39 */
40
41 PB_DS_CLASS_T_DEC
42 void
43 PB_DS_CLASS_C_DEC::
44 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
45 {
46 PB_DS_ASSERT_VALID((*this))
47 PB_DS_ASSERT_VALID(other)
48
49 if (m_size == 0)
50 {
51 other.clear();
52 return;
53 }
54
55 if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))
56 {
57 value_swap(other);
58 PB_DS_ASSERT_VALID((*this))
59 PB_DS_ASSERT_VALID(other)
60 return;
61 }
62
63 if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))
64 {
65 return;
66 }
67
68 if (m_size == 1)
69 {
70 value_swap(other);
71 PB_DS_ASSERT_VALID((*this))
72 PB_DS_ASSERT_VALID(other)
73 return;
74 }
75
76 iterator it = upper_bound(r_key);
77 PB_DS_CLASS_C_DEC new_other(other, other);
78 new_other.copy_from_ordered_range(it, end());
79 PB_DS_CLASS_C_DEC new_this(*this, *this);
80 new_this.copy_from_ordered_range(begin(), it);
81
82 // No exceptions from this point.
83 other.update(other.node_begin(), (node_update*)(&other));
84 update(node_begin(), (node_update*)this);
85 other.value_swap(new_other);
86 value_swap(new_this);
87 PB_DS_ASSERT_VALID((*this))
88 PB_DS_ASSERT_VALID(other)
89 }
90
91 PB_DS_CLASS_T_DEC
92 void
93 PB_DS_CLASS_C_DEC::
94 join(PB_DS_CLASS_C_DEC& other)
95 {
96 PB_DS_ASSERT_VALID((*this))
97 PB_DS_ASSERT_VALID(other)
98 if (other.m_size == 0)
99 return;
100
101 if (m_size == 0)
102 {
103 value_swap(other);
104 PB_DS_ASSERT_VALID((*this))
105 PB_DS_ASSERT_VALID(other)
106 return;
107 }
108
109 const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),
110 PB_DS_V2F(*other.begin()));
111
112 const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),
113 PB_DS_V2F(*begin()));
114
115 if (!greater && !lesser)
116 __throw_join_error();
117
118 PB_DS_CLASS_C_DEC new_this(*this, *this);
119
120 if (greater)
121 new_this.copy_from_ordered_range(begin(), end(),
122 other.begin(), other.end());
123 else
124 new_this.copy_from_ordered_range(other.begin(), other.end(),
125 begin(), end());
126
127 // No exceptions from this point.
128 value_swap(new_this);
129 other.clear();
130 PB_DS_ASSERT_VALID((*this))
131 PB_DS_ASSERT_VALID(other)
132 }