//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_BUFFERED_VALUE
#define OSG_BUFFERED_VALUE 1

#include <osg/DisplaySettings>
#include <vector>

namespace osg {

/** Simple buffered value array which is used for values that need to multibuffered on
  * one per graphics context basis.*/
  
template<class T>
class buffered_value
{
    public:
    
        inline buffered_value():
            _array(DisplaySettings::instance()->getMaxNumberOfGraphicsContexts(),0)
            {}

        buffered_value& operator = (const buffered_value& rhs)
        {
            _array = rhs._array;
            return *this;
        }

        inline void clear() { _array.clear(); }

        inline bool empty() const { return _array.empty(); }

        inline unsigned int size() const { return _array.size(); }

        inline T& operator[] (unsigned int pos)
        {
            // automatically resize array.
            if (_array.size()<=pos)
                _array.resize(pos+1,0);

            return _array[pos];
        }
/* // do we implement the const version???
        inline T operator[] (unsigned int pos) const
        {
            return 0;
        }
*/        

    protected:
    
        std::vector<T> _array;
};

}

#endif