xref: /freebsd-11-stable/contrib/libstdc++/include/ext/pb_ds/detail/ov_tree_map_/cond_dtor.hpp

// -*- 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 cond_dtor.hpp
 * Contains a conditional destructor
 */

template<typename Size_Type>
class cond_dtor
{
public:
  cond_dtor(value_vector a_vec, iterator& r_last_it, Size_Type total_size)
  : m_a_vec(a_vec), m_r_last_it(r_last_it), m_max_size(total_size),
    m_no_action(false)
  { }

  ~cond_dtor()
  {
    if (m_no_action)
      return;
    iterator it = m_a_vec;
    while (it != m_r_last_it)
      {
	it->~value_type();
	++it;
      }

    if (m_max_size > 0)
      value_allocator().deallocate(m_a_vec, m_max_size);
  }

  inline void
  set_no_action()
  { m_no_action = true; }

protected:
  value_vector m_a_vec;
  iterator& m_r_last_it;
  const Size_Type m_max_size;
  bool m_no_action;
};