libstdc++
binomial_heap_base_/find_fn_imps.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2017 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
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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
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35 
36 /**
37  * @file binomial_heap_base_/find_fn_imps.hpp
38  * Contains an implementation class for a base of binomial heaps.
39  */
40 
41 PB_DS_CLASS_T_DEC
42 inline typename PB_DS_CLASS_C_DEC::const_reference
43 PB_DS_CLASS_C_DEC::
44 top() const
45 {
46  PB_DS_ASSERT_VALID_COND((*this),false)
47  _GLIBCXX_DEBUG_ASSERT(!base_type::empty());
48 
49  if (m_p_max == 0)
50  const_cast<PB_DS_CLASS_C_DEC* >(this)->find_max();
51 
52  _GLIBCXX_DEBUG_ASSERT(m_p_max != 0);
53  return m_p_max->m_value;
54 }
55 
56 PB_DS_CLASS_T_DEC
57 void
58 PB_DS_CLASS_C_DEC::
59 find_max()
60 {
61  node_pointer p_cur = base_type::m_p_root;
62  m_p_max = p_cur;
63  while (p_cur != 0)
64  {
65  if (Cmp_Fn::operator()(m_p_max->m_value, p_cur->m_value))
66  m_p_max = p_cur;
67  p_cur = p_cur->m_p_next_sibling;
68  }
69 }
70