offset_stack_guard.h

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// Common Text Transformation Library
// Copyright (C) 1997-2006 by Igor Kholodov. 
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//
// mailto:cttl@users.sourceforge.net
// http://sourceforge.net/projects/cttl/

// offset_stack_guard.h

#ifndef _OFFSET_STACK_GUARD_H_INCLUDED_
#define _OFFSET_STACK_GUARD_H_INCLUDED_

namespace cttl {

template< typename UniverseT >
class offset_stack_guard {

protected:
    typedef typename UniverseT::offset_manager_T offset_guard_T;

    typedef typename UniverseT::node_T node_T;

protected:
    offset_guard_T m_offset_manager;

    std::stack< size_t >& m_offset_stack;

public:
    offset_stack_guard( std::stack< size_t >& offset_stack_, node_T& node_ )
        :
        m_offset_manager( node_.parent().container(), node_.offset() ),
        m_offset_stack( offset_stack_ )
    {
        m_offset_stack.push( m_offset_manager.stack_identity() );
    }

    ~offset_stack_guard()
    {
        m_offset_stack.pop();
    }

    static size_t offset( UniverseT const& universe_, size_t stack_identity_ )
    {
        return universe_.first.parent().container().stack_offset( stack_identity_ );
    }

    void operator=( offset_stack_guard< UniverseT > const& ) const
    {
    }

}; //offset_stack_guard


}   // namespace cttl


#endif //_OFFSET_STACK_GUARD_H_INCLUDED_

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