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// -*- C++ -*-

// Copyright (C) 2005, 2006, 2009 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 cond_dealtor.hpp

 * Contains a conditional deallocator.

 */

#ifndef PB_DS_COND_DEALTOR_HPP

#define PB_DS_COND_DEALTOR_HPP

namespace __gnu_pbds

{

  namespace detail

  {

#define PB_DS_COND_DEALTOR_CLASS_T_DEC          \

    template<typename Entry, class Allocator>

#define PB_DS_COND_DEALTOR_CLASS_C_DEC                          \

    cond_dealtor<                                               \

                                                Entry,          \

                                                Allocator>

    template<typename Entry, class Allocator>

    class cond_dealtor

    {

    public:

      typedef

      typename Allocator::template rebind<Entry>::other

      entry_allocator;

      typedef typename entry_allocator::pointer entry_pointer;

    public:

      inline

      cond_dealtor(entry_pointer p_e);

      inline

      ~cond_dealtor();

      inline void

      set_no_action();

    private:

      entry_pointer m_p_e;

      bool m_no_action_destructor;

      static entry_allocator s_alloc;

    };

    PB_DS_COND_DEALTOR_CLASS_T_DEC

    typename PB_DS_COND_DEALTOR_CLASS_C_DEC::entry_allocator

    PB_DS_COND_DEALTOR_CLASS_C_DEC::s_alloc;

    PB_DS_COND_DEALTOR_CLASS_T_DEC

    inline

    PB_DS_COND_DEALTOR_CLASS_C_DEC::

    cond_dealtor(entry_pointer p_e) :

      m_p_e(p_e),

      m_no_action_destructor(false)

    { }

    PB_DS_COND_DEALTOR_CLASS_T_DEC

    inline void

    PB_DS_COND_DEALTOR_CLASS_C_DEC::

    set_no_action()

    {

      m_no_action_destructor = true;

    }

    PB_DS_COND_DEALTOR_CLASS_T_DEC

    inline

    PB_DS_COND_DEALTOR_CLASS_C_DEC::

    ~cond_dealtor()

    {

      if (m_no_action_destructor)

        return;

      s_alloc.deallocate(m_p_e, 1);

    }

#undef PB_DS_COND_DEALTOR_CLASS_T_DEC

#undef PB_DS_COND_DEALTOR_CLASS_C_DEC

  } // namespace detail

} // namespace __gnu_pbds

#endif // #ifndef PB_DS_COND_DEALTOR_HPP