xref: /dragonfly/contrib/gcc-4.7/libstdc++-v3/include/ext/pb_ds/detail/binomial_heap_base_/find_fn_imps.hpp (revision e4b17023)

// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009, 2010, 2011 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, or (at your option) any later
// version.

// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.

// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.

/**
 * @file binomial_heap_base_/find_fn_imps.hpp
 * Contains an implementation class for a base of binomial heaps.
 */

PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::const_reference
PB_DS_CLASS_C_DEC::
top() const
{
  PB_DS_ASSERT_VALID_COND((*this),false)
  _GLIBCXX_DEBUG_ASSERT(!base_type::empty());

  if (m_p_max == 0)
    const_cast<PB_DS_CLASS_C_DEC* >(this)->find_max();

  _GLIBCXX_DEBUG_ASSERT(m_p_max != 0);
  return m_p_max->m_value;
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
find_max()
{
  node_pointer p_cur = base_type::m_p_root;
  m_p_max = p_cur;
  while (p_cur != 0)
    {
      if (Cmp_Fn::operator()(m_p_max->m_value, p_cur->m_value))
	m_p_max = p_cur;
      p_cur = p_cur->m_p_next_sibling;
    }
}