cond_key_dtor_entry_dealtor.hpp

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// -*- 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.

/**
 * @file cond_key_dtor_entry_dealtor.hpp
 * Contains a conditional key destructor, used for exception handling.
 */

namespace pb_assoc
{

  namespace detail
  {

#define PB_ASSOC_CLASS_T_DEC \
	template<class HT_Map>

#define PB_ASSOC_CLASS_C_DEC \
	PB_ASSOC_CKDED_CLASS_NAME< \
		HT_Map>

    /**
     * A conditional key destructor, used for exception handling.
     **/
    template<class HT_Map>
    class PB_ASSOC_CKDED_CLASS_NAME
    {
    public:
      typedef typename HT_Map::entry entry;

      typedef typename HT_Map::entry_allocator entry_allocator;

      typedef typename HT_Map::key_type key_type;

    public:
      inline
      PB_ASSOC_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e);

      inline
      ~PB_ASSOC_CKDED_CLASS_NAME();

      inline void
      set_key_destruct();

      inline void
      set_no_action_destructor();

    protected:
      entry_allocator* const m_p_a;
      entry* const m_p_e;

      bool m_key_destruct;
      bool m_no_action_destructor;
    };

    PB_ASSOC_CLASS_T_DEC
    inline
    PB_ASSOC_CLASS_C_DEC::
    PB_ASSOC_CKDED_CLASS_NAME(entry_allocator* p_a, entry* p_e) :
      m_p_a(p_a),
      m_p_e(p_e),
      m_key_destruct(false),
      m_no_action_destructor(false)
    { }

    PB_ASSOC_CLASS_T_DEC
    inline void
    PB_ASSOC_CLASS_C_DEC::
    set_key_destruct()
    {
      m_key_destruct = true;
    }

    PB_ASSOC_CLASS_T_DEC
    inline void
    PB_ASSOC_CLASS_C_DEC::
    set_no_action_destructor()
    {
      m_no_action_destructor = true;
    }

    PB_ASSOC_CLASS_T_DEC
    inline
    PB_ASSOC_CLASS_C_DEC::
    ~PB_ASSOC_CKDED_CLASS_NAME()
    {
      if (m_no_action_destructor)
	return;

      if (m_key_destruct)
	m_p_e->m_value.first.~key_type();

      m_p_a->deallocate(m_p_e, 1);
    }

#undef PB_ASSOC_CLASS_T_DEC
#undef PB_ASSOC_CLASS_C_DEC

  } // namespace detail

} // namespace pb_assoc