source: svn/newcon3bcm2_21bu/toolchain/include/c++/3.4.2/debug/safe_iterator.tcc

// Debugging iterator implementation (out of line) -*- 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.

/** @file safe_iterator.tcc
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC
#define _GLIBCXX_DEBUG_SAFE_ITERATOR_TCC 1

namespace __gnu_debug
{
  template<typename _Iterator, typename _Sequence>
    bool
    _Safe_iterator<_Iterator, _Sequence>::
    _M_can_advance(const difference_type& __n) const
    {
      typedef typename _Sequence::const_iterator const_iterator;

      if (this->_M_singular())
        return false;
      if (__n == 0)
        return true;
      if (__n < 0)
        {
          const_iterator __begin =
            static_cast<const _Sequence*>(_M_sequence)->begin();
          pair<difference_type, _Distance_precision> __dist =
            this->_M_get_distance(__begin, *this);
          bool __ok =  (__dist.second == __dp_exact && __dist.first >= -__n
                        || __dist.second != __dp_exact && __dist.first > 0);
          return __ok;
        }
      else
        {
          const_iterator __end =
            static_cast<const _Sequence*>(_M_sequence)->end();
          pair<difference_type, _Distance_precision> __dist =
            this->_M_get_distance(*this, __end);
          bool __ok = (__dist.second == __dp_exact && __dist.first >= __n
                       || __dist.second != __dp_exact && __dist.first > 0);
          return __ok;
        }
    }

  template<typename _Iterator, typename _Sequence>
    template<typename _Other>
      bool
      _Safe_iterator<_Iterator, _Sequence>::
      _M_valid_range(const _Safe_iterator<_Other, _Sequence>& __rhs) const
      {
        if (!_M_can_compare(__rhs))
          return false;

        /* Determine if we can order the iterators without the help of
           the container */
        pair<difference_type, _Distance_precision> __dist =
          this->_M_get_distance(*this, __rhs);
        switch (__dist.second) {
        case __dp_equality:
          if (__dist.first == 0)
            return true;
          break;

        case __dp_sign:
        case __dp_exact:
          return __dist.first >= 0;
        }

        /* We can only test for equality, but check if one of the
           iterators is at an extreme. */
        if (_M_is_begin() || __rhs._M_is_end())
          return true;
        else if (_M_is_end() || __rhs._M_is_begin())
          return false;

        // Assume that this is a valid range; we can't check anything else
        return true;
      }

  template<typename _Iterator, typename _Sequence>
    void
    _Safe_iterator<_Iterator, _Sequence>::
    _M_invalidate()
    {
      typedef typename _Sequence::iterator iterator;
      typedef typename _Sequence::const_iterator const_iterator;

      if (!this->_M_singular())
        {
          for (_Safe_iterator_base* iter = _M_sequence->_M_iterators; iter; )
            {
              iterator* __victim = static_cast<iterator*>(iter);
              iter = iter->_M_next;
              if (this->base() == __victim->base())
                __victim->_M_version = 0;
            }
          for (_Safe_iterator_base* iter2 = _M_sequence->_M_const_iterators;
               iter2; /* increment in loop */)
            {
              const_iterator* __victim = static_cast<const_iterator*>(iter2);
              iter2 = iter2->_M_next;
              if (this->base() == __victim->base())
                __victim->_M_version = 0;
            }
          _M_version = 0;
        }
    }
} // namespace __gnu_debug

#endif