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

   1 // -*- C++ -*-
   2
   3 // Copyright (C) 2005-2019 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_/find_fn_imps.hpp
  38  * Contains an implementation class for splay_tree_.
  39  */
  40
  41 PB_DS_CLASS_T_DEC
  42 inline typename PB_DS_CLASS_C_DEC::point_iterator
  43 PB_DS_CLASS_C_DEC::
  44 find(key_const_reference r_key)
  45 {
  46   node_pointer p_found = find_imp(r_key);
  47   if (p_found != base_type::m_p_head)
  48     splay(p_found);
  49   return point_iterator(p_found);
  50 }
  51
  52 PB_DS_CLASS_T_DEC
  53 inline typename PB_DS_CLASS_C_DEC::point_const_iterator
  54 PB_DS_CLASS_C_DEC::
  55 find(key_const_reference r_key) const
  56 {
  57   const node_pointer p_found = find_imp(r_key);
  58   if (p_found != base_type::m_p_head)
  59     const_cast<PB_DS_CLASS_C_DEC* >(this)->splay(p_found);
  60   return point_iterator(p_found);
  61 }
  62
  63 PB_DS_CLASS_T_DEC
  64 inline typename PB_DS_CLASS_C_DEC::node_pointer
  65 PB_DS_CLASS_C_DEC::
  66 find_imp(key_const_reference r_key)
  67 {
  68   _GLIBCXX_DEBUG_ONLY(base_type::structure_only_assert_valid(__FILE__,
  69                                                              __LINE__);)
  70   node_pointer p_nd = base_type::m_p_head->m_p_parent;
  71   while (p_nd != 0)
  72     if (!Cmp_Fn::operator()(PB_DS_V2F(p_nd->m_value), r_key))
  73       {
  74         if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(p_nd->m_value)))
  75           return p_nd;
  76         p_nd = p_nd->m_p_left;
  77       }
  78     else
  79       p_nd = p_nd->m_p_right;
  80   return base_type::m_p_head;
  81 }
  82
  83 PB_DS_CLASS_T_DEC
  84 inline const typename PB_DS_CLASS_C_DEC::node_pointer
  85 PB_DS_CLASS_C_DEC::
  86 find_imp(key_const_reference r_key) const
  87 {
  88   PB_DS_ASSERT_VALID((*this))
  89   node_pointer p_nd = base_type::m_p_head->m_p_parent;
  90   while (p_nd != 0)
  91     if (!Cmp_Fn::operator()(PB_DS_V2F(p_nd->m_value), r_key))
  92       {
  93         if (!Cmp_Fn::operator()(r_key, PB_DS_V2F(p_nd->m_value)))
  94           return p_nd;
  95         p_nd = p_nd->m_p_left;
  96       }
  97     else
  98       p_nd = p_nd->m_p_right;
  99   return base_type::m_p_head;
 100 }