MyGUI_Bitwise.h

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#ifndef MYGUI_BITWISE_H_
#define MYGUI_BITWISE_H_
 
#include "MyGUI_Prerequest.h"
 
namespace MyGUI
{
 
    class Bitwise
    {
    public:
        template<typename Type>
        static inline Type firstPO2From(Type _value)
        {
            --_value;
            _value |= _value >> 16;
            _value |= _value >> 8;
            _value |= _value >> 4;
            _value |= _value >> 2;
            _value |= _value >> 1;
            ++_value;
            return _value;
        }
 
        template<typename Type>
        static inline bool isPO2(Type _value)
        {
            return (_value & (_value - 1)) == 0;
        }
 
    };
 
} // namespace MyGUI
 
#endif // MYGUI_BITWISE_H_