1// -*- C++ -*-
2
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.
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// 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.
20
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.
30
31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
32
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.
41
42/**
43 * @file split_join_fn_imps.hpp
44 * Contains an implementation class for ov_tree_.
45 */
46
47PB_DS_CLASS_T_DEC
48void
49PB_DS_CLASS_C_DEC::
50split(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)
51{
52  _GLIBCXX_DEBUG_ONLY(assert_valid();)
53  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
54
55  if (m_size == 0)
56    {
57      other.clear();
58      _GLIBCXX_DEBUG_ONLY(assert_valid();)
59      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
60      return;
61    }
62
63  if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))
64    {
65      value_swap(other);
66      _GLIBCXX_DEBUG_ONLY(assert_valid();)
67      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
68      return;
69    }
70
71  if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))
72    {
73      _GLIBCXX_DEBUG_ONLY(assert_valid();)
74      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
75      return;
76    }
77
78  if (m_size == 1)
79    {
80      value_swap(other);
81      _GLIBCXX_DEBUG_ONLY(assert_valid();)
82      _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
83      return;
84    }
85
86  _GLIBCXX_DEBUG_ONLY(map_debug_base::join(other);)
87  iterator it = upper_bound(r_key);
88  PB_DS_CLASS_C_DEC new_other(other, other);
89  new_other.copy_from_ordered_range(it, end());
90  PB_DS_CLASS_C_DEC new_this(*this, * this);
91  new_this.copy_from_ordered_range(begin(), it);
92
93  // No exceptions from this point.
94  _GLIBCXX_DEBUG_ONLY(map_debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
95  other.update(other.node_begin(), (node_update* )(&other));
96  update(node_begin(), (node_update* )this);
97  other.value_swap(new_other);
98  value_swap(new_this);
99  _GLIBCXX_DEBUG_ONLY(assert_valid();)
100  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
101}
102
103PB_DS_CLASS_T_DEC
104void
105PB_DS_CLASS_C_DEC::
106join(PB_DS_CLASS_C_DEC& other)
107{
108  _GLIBCXX_DEBUG_ONLY(assert_valid();)
109  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
110  if (other.m_size == 0)
111    return;
112
113  if (m_size == 0)
114    {
115      value_swap(other);
116      return;
117    }
118
119  const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),
120					  PB_DS_V2F(*other.begin()));
121
122  const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),
123					 PB_DS_V2F(*begin()));
124
125  if (!greater && !lesser)
126    __throw_join_error();
127
128  PB_DS_CLASS_C_DEC new_this(*this, *this);
129
130  if (greater)
131    new_this.copy_from_ordered_range(begin(), end(),
132				     other.begin(), other.end());
133  else
134    new_this.copy_from_ordered_range(other.begin(), other.end(),
135				     begin(), end());
136
137  // No exceptions from this point.
138  _GLIBCXX_DEBUG_ONLY(map_debug_base::join(other);)
139  value_swap(new_this);
140  other.clear();
141  _GLIBCXX_DEBUG_ONLY(assert_valid();)
142  _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
143}
144