contrib/gcc-8.0/libstdc++-v3/include/ext/pb_ds/detail/ov_tree_map_/split_join_fn_imps.hpp

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2018 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 }