safe_base.h

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// Safe sequence/iterator base implementation  -*- C++ -*-

// Copyright (C) 2003, 2004
// 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.

#ifndef _GLIBCXX_DEBUG_SAFE_BASE_H
#define _GLIBCXX_DEBUG_SAFE_BASE_H 1

namespace __gnu_debug
{
  class _Safe_sequence_base;

  class _Safe_iterator_base
  {
  public:
    _Safe_sequence_base* _M_sequence;

    unsigned int         _M_version;

    _Safe_iterator_base* _M_prior;

    _Safe_iterator_base* _M_next;

  protected:
    _Safe_iterator_base()
    : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
    { }

    _Safe_iterator_base(const _Safe_sequence_base* __seq, bool __constant)
    : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
    { this->_M_attach(const_cast<_Safe_sequence_base*>(__seq), __constant); }

    _Safe_iterator_base(const _Safe_iterator_base& __x, bool __constant)
    : _M_sequence(0), _M_version(0), _M_prior(0), _M_next(0)
    { this->_M_attach(__x._M_sequence, __constant); }

    _Safe_iterator_base&
    operator=(const _Safe_iterator_base&);

    explicit
    _Safe_iterator_base(const _Safe_iterator_base&);

    ~_Safe_iterator_base() { this->_M_detach(); }

  public:
    void _M_attach(_Safe_sequence_base* __seq, bool __constant);

    void _M_detach();

    bool _M_attached_to(const _Safe_sequence_base* __seq) const
    { return _M_sequence == __seq; }

    bool _M_singular() const;

    bool _M_can_compare(const _Safe_iterator_base& __x) const;
  };

  class _Safe_sequence_base
  {
  public:
    _Safe_iterator_base* _M_iterators;

    _Safe_iterator_base* _M_const_iterators;

    mutable unsigned int _M_version;

  protected:
    // Initialize with a version number of 1 and no iterators
    _Safe_sequence_base()
    : _M_iterators(0), _M_const_iterators(0), _M_version(1)
    { }

    ~_Safe_sequence_base()
    { this->_M_detach_all(); }

    void
    _M_detach_all();

    void
    _M_detach_singular();

    void
    _M_revalidate_singular();

    void
    _M_swap(_Safe_sequence_base& __x);

  public:
    void
    _M_invalidate_all() const
    { if (++_M_version == 0) _M_version = 1; }
  };
} // namespace __gnu_debug

#endif

---