libstdc++-v3/include/ext/pb_ds/detail/ov_tree_map_/split_join_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005, 2006, 2009 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 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(const_key_reference r_key, PB_DS_CLASS_C_DEC& other)
  45 {
  46   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  47   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  48
  49   if (m_size == 0)
  50     {
  51       other.clear();
  52       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  53       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  54       return;
  55     }
  56
  57   if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))
  58     {
  59       value_swap(other);
  60       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  61       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  62       return;
  63     }
  64
  65   if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))
  66     {
  67       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  68       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  69       return;
  70     }
  71
  72   if (m_size == 1)
  73     {
  74       value_swap(other);
  75       _GLIBCXX_DEBUG_ONLY(assert_valid();)
  76       _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  77       return;
  78     }
  79
  80   _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
  81   iterator it = upper_bound(r_key);
  82   PB_DS_CLASS_C_DEC new_other(other, other);
  83   new_other.copy_from_ordered_range(it, end());
  84   PB_DS_CLASS_C_DEC new_this(*this, * this);
  85   new_this.copy_from_ordered_range(begin(), it);
  86
  87   // No exceptions from this point.
  88   _GLIBCXX_DEBUG_ONLY(debug_base::split(r_key,(Cmp_Fn& )(*this), other);)
  89   other.update(other.node_begin(), (node_update* )(&other));
  90   update(node_begin(), (node_update* )this);
  91   other.value_swap(new_other);
  92   value_swap(new_this);
  93   _GLIBCXX_DEBUG_ONLY(assert_valid();)
  94   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
  95 }
  96
  97 PB_DS_CLASS_T_DEC
  98 void
  99 PB_DS_CLASS_C_DEC::
 100 join(PB_DS_CLASS_C_DEC& other)
 101 {
 102   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 103   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 104   if (other.m_size == 0)
 105     return;
 106
 107   if (m_size == 0)
 108     {
 109       value_swap(other);
 110       return;
 111     }
 112
 113   const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),
 114                                           PB_DS_V2F(*other.begin()));
 115
 116   const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),
 117                                          PB_DS_V2F(*begin()));
 118
 119   if (!greater && !lesser)
 120     __throw_join_error();
 121
 122   PB_DS_CLASS_C_DEC new_this(*this, *this);
 123
 124   if (greater)
 125     new_this.copy_from_ordered_range(begin(), end(),
 126                                      other.begin(), other.end());
 127   else
 128     new_this.copy_from_ordered_range(other.begin(), other.end(),
 129                                      begin(), end());
 130
 131   // No exceptions from this point.
 132   _GLIBCXX_DEBUG_ONLY(debug_base::join(other);)
 133   value_swap(new_this);
 134   other.clear();
 135   _GLIBCXX_DEBUG_ONLY(assert_valid();)
 136   _GLIBCXX_DEBUG_ONLY(other.assert_valid();)
 137 }