libstdc++-v3/include/ext/pb_ds/detail/splay_tree_/insert_fn_imps.hpp

   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 splay_tree_/insert_fn_imps.hpp
  38  * Contains an implementation class for splay_tree_.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 inline std::pair<typename PB_DS_CLASS_C_DEC::point_iterator, bool>
  43 PB_DS_CLASS_C_DEC::
  44 insert(const_reference r_value)
  45 {
  46   PB_DS_ASSERT_VALID((*this))
  47   std::pair<point_iterator, bool> ins_pair = insert_leaf_imp(r_value);
  48   ins_pair.first.m_p_nd->m_special = false;
  49   PB_DS_ASSERT_VALID((*this))
  50   splay(ins_pair.first.m_p_nd);
  51   PB_DS_ASSERT_VALID((*this))
  52   return ins_pair;
  53 }
  54
  55 PB_DS_CLASS_T_DEC
  56 inline std::pair<typename PB_DS_CLASS_C_DEC::point_iterator, bool>
  57 PB_DS_CLASS_C_DEC::
  58 insert_leaf_imp(const_reference r_value)
  59 {
  60   _GLIBCXX_DEBUG_ONLY(base_type::structure_only_assert_valid(__FILE__,
  61                                                              __LINE__);)
  62   if (base_type::m_size == 0)
  63     return std::make_pair(base_type::insert_imp_empty(r_value), true);
  64
  65   node_pointer p_nd = base_type::m_p_head->m_p_parent;
  66   node_pointer p_pot = base_type::m_p_head;
  67
  68   while (p_nd != 0)
  69     if (!Cmp_Fn::operator()(PB_DS_V2F(p_nd->m_value), PB_DS_V2F(r_value)))
  70       {
  71         if (!Cmp_Fn::operator()(PB_DS_V2F(r_value), PB_DS_V2F(p_nd->m_value)))
  72           {
  73             return std::make_pair(point_iterator(p_nd), false);
  74           }
  75         p_pot = p_nd;
  76         p_nd = p_nd->m_p_left;
  77       }
  78     else
  79       p_nd = p_nd->m_p_right;
  80
  81   if (p_pot == base_type::m_p_head)
  82     return std::make_pair(base_type::insert_leaf_new(r_value, base_type::m_p_head->m_p_right, false), true);
  83
  84   PB_DS_CHECK_KEY_DOES_NOT_EXIST(PB_DS_V2F(r_value))
  85
  86   p_nd = p_pot->m_p_left;
  87   if (p_nd == 0)
  88     return (std::make_pair(base_type::insert_leaf_new(r_value, p_pot, true), true));
  89
  90   while (p_nd->m_p_right != 0)
  91     p_nd = p_nd->m_p_right;
  92
  93   return std::make_pair(this->insert_leaf_new(r_value, p_nd, false), true);
  94 }