bitfieldfixedsize.h

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/*
* Copyright 2015 Autodesk, Inc. All rights reserved.
* Use of this software is subject to the terms of the Autodesk license agreement and any attachments or Appendices thereto provided at the time of installation or download,
* or which otherwise accompanies this software in either electronic or hard copy form, or which is signed by you and accepted by Autodesk.
*/


#ifndef Navigation_BitFieldFixedSize_H
#define Navigation_BitFieldFixedSize_H

#include "gwnavruntime/base/types.h"
#include <string.h>

namespace Kaim
{

template <KyUInt32 N>
class BitFieldFixedSize
{
public:
    BitFieldFixedSize() { UnsetAllBits(); }

    void SetBit(KyUInt32 index) { GetByteByGlobalIndex(index) |= (KyUInt8) 1 << GetPosInElem(index); }
    void UnsetBit(KyUInt32 index) { GetByteByGlobalIndex(index) &= (KyUInt8) ~(1 << GetPosInElem(index)); }

    void UnsetAllBits() { memset(m_bytes, '\0', sizeof (m_bytes)); }
    void SetAllBits() { memset(m_bytes, '\xFF', sizeof (m_bytes)); }

    bool IsBitSet(KyUInt32 index) const { return ((GetByteByGlobalIndex(index) >> GetPosInElem(index)) & 0x01) != 0; }
protected:
    const KyUInt8& GetByteByGlobalIndex(KyUInt32 index) const { return m_bytes[index / nbBitPerByte]; }
    KyUInt8& GetByteByGlobalIndex(KyUInt32 index) { return m_bytes[index / nbBitPerByte]; }
    KyUInt32 GetPosInElem(KyUInt32 index) const { return (index & mask); }
protected:
    enum { mask = 0x07, nbBitPerByte = 8};
    enum { nbBytes = (N + 7) / 8 };
protected:
    KyUInt8 m_bytes[nbBytes];
};

} // namespace Kaim

#endif // Navigation_BitFieldFixedSize_H