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  1. // -*- C++ -*-
  2.  
  3. // Copyright (C) 2005-2015 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. }
  133.