cond_dtor.hpp

Go to the documentation of this file.

// -*- C++ -*-

// Copyright (C) 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.

class cond_dtor
{
public:
  cond_dtor(pointer 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(
                   const_cast<typename value_allocator::pointer>(m_a_vec),
                   m_max_size);
  }

  inline void
  set_no_action()
  {
    m_no_action = true;
  }

protected:
  pointer m_a_vec;

  iterator& m_r_last_it;

  const size_type m_max_size;

  bool m_no_action;
};

---