92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
#pragma once
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#include <assert.h>
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namespace Lawn { // namespace start
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class LBitField_Dynamic_IT
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{
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public:
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// construction
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void Initialize();
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void Terminate();
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private:
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// prevent copying (see effective C++ scott meyers)
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// there is no implementation for copy constructor, hence compiler will complain if you try to copy.
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LBitField_Dynamic_IT& operator=(const LBitField_Dynamic_IT&);
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public:
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// create automatically blanks
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void Create(unsigned int uiNumBits, bool bBlank = true);
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void Destroy();
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// public funcs
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inline unsigned int GetNumBits() const {return m_uiNumBits;}
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inline unsigned int GetBit(unsigned int uiBit) const;
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inline void SetBit(unsigned int uiBit, unsigned int bSet);
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void Blank(bool bSetOrZero = false);
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void Invert();
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void CopyFrom(const LBitField_Dynamic_IT &source);
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// loading / saving
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unsigned char * GetData() {return m_pucData;}
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const unsigned char * GetData() const {return m_pucData;}
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unsigned int GetNumBytes() const {return m_uiNumBytes;}
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protected:
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// member funcs
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void Initialize_Do();
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void Terminate_Do();
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// member vars
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unsigned char * m_pucData;
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unsigned int m_uiNumBytes;
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unsigned int m_uiNumBits;
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};
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class LBitField_Dynamic : public LBitField_Dynamic_IT
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{
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public:
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// call initialize and terminate automatically
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LBitField_Dynamic(unsigned int uiNumBits) {Initialize_Do(); Create(uiNumBits);}
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LBitField_Dynamic() {Initialize_Do();}
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~LBitField_Dynamic() {Terminate_Do();}
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// disallow explicit calls
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void Initialize();
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void Terminate();
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};
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//////////////////////////////////////////////////////////
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inline unsigned int LBitField_Dynamic_IT::GetBit(unsigned int uiBit) const
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{
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assert (m_pucData);
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unsigned int uiByteNumber = uiBit >> 3; // divide by 8
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assert (uiByteNumber < m_uiNumBytes);
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unsigned char uc = m_pucData[uiByteNumber];
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unsigned int uiBitSet = uc & (1 << (uiBit & 7));
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return uiBitSet;
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}
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inline void LBitField_Dynamic_IT::SetBit(unsigned int uiBit, unsigned int bSet)
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{
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assert (m_pucData);
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unsigned int uiByteNumber = uiBit >> 3; // divide by 8
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assert (uiByteNumber < m_uiNumBytes);
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unsigned char uc = m_pucData[uiByteNumber];
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unsigned int uiMask = 1 << (uiBit & 7);
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if (bSet)
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{
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uc = uc | uiMask;
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}
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else
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{
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uc &= ~uiMask;
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}
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m_pucData[uiByteNumber] = uc;
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}
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} // namespace end
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