// -*- C++ -*-

// Copyright (C) 2005, 2006 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 2, 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.

// You should have received a copy of the GNU General Public License
// along with this library; see the file COPYING.  If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
// MA 02111-1307, USA.

// As a special exception, you may use this file as part of a free
// software library without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to
// produce an executable, this file does not by itself cause the
// resulting executable to be covered by the GNU General Public
// License.  This exception does not however invalidate any other
// reasons why the executable file might be covered by the GNU General
// Public License.

// 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 constructors_destructor_fn_imps.hpp
 * Contains an implementation class for bin_search_tree_.
 */

PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_allocator
PB_DS_CLASS_C_DEC::s_node_allocator;

PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
PB_DS_CLASS_NAME() : m_p_head(s_node_allocator.allocate(1)), m_size(0)
{
  initialize();
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
}

PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
PB_DS_CLASS_NAME(const Cmp_Fn& r_cmp_fn) :
  Cmp_Fn(r_cmp_fn), m_p_head(s_node_allocator.allocate(1)), m_size(0)
{
  initialize();
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
}

PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
PB_DS_CLASS_NAME(const Cmp_Fn& r_cmp_fn, const node_update& r_node_update) :
  Cmp_Fn(r_cmp_fn),
  node_update(r_node_update),
  m_p_head(s_node_allocator.allocate(1)),
  m_size(0)
{
  initialize();
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
}

PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
PB_DS_CLASS_NAME(const PB_DS_CLASS_C_DEC& other) :
#ifdef _GLIBCXX_DEBUG
  debug_base(other),
#endif 
#ifdef PB_DS_TREE_TRACE
  PB_DS_TREE_TRACE_BASE_C_DEC(other),
#endif 
  Cmp_Fn(other),
  node_update(other),
  m_p_head(s_node_allocator.allocate(1)),
  m_size(0)
{
  initialize();
  m_size = other.m_size;
  _GLIBCXX_DEBUG_ONLY(other.structure_only_assert_valid();)

    try
      {
        m_p_head->m_p_parent = recursive_copy_node(other.m_p_head->m_p_parent);
        if (m_p_head->m_p_parent != NULL)
	  m_p_head->m_p_parent->m_p_parent = m_p_head;
        m_size = other.m_size;
        initialize_min_max();
      }
    catch(...)
      {
        _GLIBCXX_DEBUG_ONLY(debug_base::clear();)
	s_node_allocator.deallocate(m_p_head, 1);
        __throw_exception_again;
      }
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
swap(PB_DS_CLASS_C_DEC& other)
{
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
  _GLIBCXX_DEBUG_ONLY(other.structure_only_assert_valid();)
  value_swap(other);
  std::swap((Cmp_Fn& )(*this), (Cmp_Fn& )other);
  _GLIBCXX_DEBUG_ONLY(structure_only_assert_valid();)
  _GLIBCXX_DEBUG_ONLY(other.structure_only_assert_valid();)
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
value_swap(PB_DS_CLASS_C_DEC& other)
{
  _GLIBCXX_DEBUG_ONLY(debug_base::swap(other);)
  std::swap(m_p_head, other.m_p_head);
  std::swap(m_size, other.m_size);
}

PB_DS_CLASS_T_DEC
PB_DS_CLASS_C_DEC::
~PB_DS_CLASS_NAME()
{
  clear();
  s_node_allocator.deallocate(m_p_head, 1);
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
initialize()
{
  m_p_head->m_p_parent = NULL;
  m_p_head->m_p_left = m_p_head;
  m_p_head->m_p_right = m_p_head;
  m_size = 0;
}

PB_DS_CLASS_T_DEC
typename PB_DS_CLASS_C_DEC::node_pointer
PB_DS_CLASS_C_DEC::
recursive_copy_node(const node_pointer p_nd)
{
  if (p_nd == NULL)
    return (NULL);

  node_pointer p_ret = s_node_allocator.allocate(1);
  try
    {
      new (p_ret) node(*p_nd);
    }
  catch(...)
    {
      s_node_allocator.deallocate(p_ret, 1);
      __throw_exception_again;
    }

  p_ret->m_p_left = p_ret->m_p_right = NULL;

  try
    {
      p_ret->m_p_left = recursive_copy_node(p_nd->m_p_left);
      p_ret->m_p_right = recursive_copy_node(p_nd->m_p_right);
    }
  catch(...)
    {
      clear_imp(p_ret);
      __throw_exception_again;
    }

  if (p_ret->m_p_left != NULL)
    p_ret->m_p_left->m_p_parent = p_ret;

  if (p_ret->m_p_right != NULL)
    p_ret->m_p_right->m_p_parent = p_ret;

  _GLIBCXX_DEBUG_ONLY(assert_node_consistent(p_ret);)
  return p_ret;
}

PB_DS_CLASS_T_DEC
void
PB_DS_CLASS_C_DEC::
initialize_min_max()
{
  if (m_p_head->m_p_parent == NULL)
    {
      m_p_head->m_p_left = m_p_head->m_p_right = m_p_head;
      return;
    }

  {
    node_pointer p_min = m_p_head->m_p_parent;
    while (p_min->m_p_left != NULL)
      p_min = p_min->m_p_left;
    m_p_head->m_p_left = p_min;
  }

  {
    node_pointer p_max = m_p_head->m_p_parent;
    while (p_max->m_p_right != NULL)
      p_max = p_max->m_p_right;
    m_p_head->m_p_right = p_max;
  }
}

