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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2021 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 #ifdef PB_DS_CLASS_C_DEC
  42
  43 PB_DS_CLASS_T_DEC
  44 void
  45 PB_DS_CLASS_C_DEC::
  46 split(key_const_reference r_key, PB_DS_CLASS_C_DEC& other)
  47 {
  48   PB_DS_ASSERT_VALID((*this))
  49   PB_DS_ASSERT_VALID(other)
  50
  51   if (m_size == 0)
  52     {
  53       other.clear();
  54       return;
  55     }
  56
  57   if (Cmp_Fn::operator()(r_key, PB_DS_V2F(*begin())))
  58     {
  59       value_swap(other);
  60       PB_DS_ASSERT_VALID((*this))
  61       PB_DS_ASSERT_VALID(other)
  62       return;
  63     }
  64
  65   if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(*(end() - 1))))
  66     {
  67       return;
  68     }
  69
  70   if (m_size == 1)
  71     {
  72       value_swap(other);
  73       PB_DS_ASSERT_VALID((*this))
  74       PB_DS_ASSERT_VALID(other)
  75       return;
  76     }
  77
  78   iterator it = upper_bound(r_key);
  79   PB_DS_CLASS_C_DEC new_other(other, other);
  80   new_other.copy_from_ordered_range(it, end());
  81   PB_DS_CLASS_C_DEC new_this(*this, *this);
  82   new_this.copy_from_ordered_range(begin(), it);
  83
  84   // No exceptions from this point.
  85   other.update(other.node_begin(), (node_update*)(&other));
  86   update(node_begin(), (node_update*)this);
  87   other.value_swap(new_other);
  88   value_swap(new_this);
  89   PB_DS_ASSERT_VALID((*this))
  90   PB_DS_ASSERT_VALID(other)
  91 }
  92
  93 PB_DS_CLASS_T_DEC
  94 void
  95 PB_DS_CLASS_C_DEC::
  96 join(PB_DS_CLASS_C_DEC& other)
  97 {
  98   PB_DS_ASSERT_VALID((*this))
  99   PB_DS_ASSERT_VALID(other)
 100   if (other.m_size == 0)
 101     return;
 102
 103   if (m_size == 0)
 104     {
 105       value_swap(other);
 106       PB_DS_ASSERT_VALID((*this))
 107       PB_DS_ASSERT_VALID(other)
 108       return;
 109     }
 110
 111   const bool greater = Cmp_Fn::operator()(PB_DS_V2F(*(end() - 1)),
 112                                           PB_DS_V2F(*other.begin()));
 113
 114   const bool lesser = Cmp_Fn::operator()(PB_DS_V2F(*(other.end() - 1)),
 115                                          PB_DS_V2F(*begin()));
 116
 117   if (!greater && !lesser)
 118     __throw_join_error();
 119
 120   PB_DS_CLASS_C_DEC new_this(*this, *this);
 121
 122   if (greater)
 123     new_this.copy_from_ordered_range(begin(), end(),
 124                                      other.begin(), other.end());
 125   else
 126     new_this.copy_from_ordered_range(other.begin(), other.end(),
 127                                      begin(), end());
 128
 129   // No exceptions from this point.
 130   value_swap(new_this);
 131   other.clear();
 132   PB_DS_ASSERT_VALID((*this))
 133   PB_DS_ASSERT_VALID(other)
 134 }
 135 #endif