182 lines
3.5 KiB
C++
182 lines
3.5 KiB
C++
//========= Copyright © 1996-2002, Valve LLC, All rights reserved. ============
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================
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#ifndef BITVEC_H
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#define BITVEC_H
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#ifdef _WIN32
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#ifndef __MINGW32__
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#pragma once
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#endif /* not __MINGW32__ */
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#endif
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#include <assert.h>
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class CBitVecAccessor
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{
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public:
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CBitVecAccessor(unsigned long *pDWords, int iBit);
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void operator=(int val);
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operator unsigned long();
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private:
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unsigned long *m_pDWords;
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int m_iBit;
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};
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// CBitVec allows you to store a list of bits and do operations on them like they were
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// an atomic type.
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template<int NUM_BITS>
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class CBitVec
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{
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public:
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CBitVec();
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// Set all values to the specified value (0 or 1..)
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void Init(int val = 0);
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// Access the bits like an array.
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CBitVecAccessor operator[](int i);
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// Operations on other bit vectors.
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CBitVec& operator=(CBitVec<NUM_BITS> const &other);
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bool operator==(CBitVec<NUM_BITS> const &other);
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bool operator!=(CBitVec<NUM_BITS> const &other);
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// Get underlying dword representations of the bits.
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int GetNumDWords();
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unsigned long GetDWord(int i);
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void SetDWord(int i, unsigned long val);
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int GetNumBits();
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private:
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enum {NUM_DWORDS = NUM_BITS/32 + !!(NUM_BITS & 31)};
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unsigned long m_DWords[NUM_DWORDS];
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};
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// ------------------------------------------------------------------------ //
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// CBitVecAccessor inlines.
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// ------------------------------------------------------------------------ //
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inline CBitVecAccessor::CBitVecAccessor(unsigned long *pDWords, int iBit)
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{
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m_pDWords = pDWords;
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m_iBit = iBit;
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}
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inline void CBitVecAccessor::operator=(int val)
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{
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if(val)
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m_pDWords[m_iBit >> 5] |= (1 << (m_iBit & 31));
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else
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m_pDWords[m_iBit >> 5] &= ~(unsigned long)(1 << (m_iBit & 31));
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}
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inline CBitVecAccessor::operator unsigned long()
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{
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return m_pDWords[m_iBit >> 5] & (1 << (m_iBit & 31));
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}
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// ------------------------------------------------------------------------ //
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// CBitVec inlines.
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// ------------------------------------------------------------------------ //
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template<int NUM_BITS>
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inline int CBitVec<NUM_BITS>::GetNumBits()
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{
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return NUM_BITS;
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}
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template<int NUM_BITS>
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inline CBitVec<NUM_BITS>::CBitVec()
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{
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for(int i=0; i < NUM_DWORDS; i++)
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m_DWords[i] = 0;
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}
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template<int NUM_BITS>
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inline void CBitVec<NUM_BITS>::Init(int val)
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{
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for(int i=0; i < GetNumBits(); i++)
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{
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(*this)[i] = val;
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}
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}
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template<int NUM_BITS>
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inline CBitVec<NUM_BITS>& CBitVec<NUM_BITS>::operator=(CBitVec<NUM_BITS> const &other)
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{
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memcpy(m_DWords, other.m_DWords, sizeof(m_DWords));
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return *this;
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}
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template<int NUM_BITS>
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inline CBitVecAccessor CBitVec<NUM_BITS>::operator[](int i)
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{
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assert(i >= 0 && i < GetNumBits());
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return CBitVecAccessor(m_DWords, i);
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}
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template<int NUM_BITS>
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inline bool CBitVec<NUM_BITS>::operator==(CBitVec<NUM_BITS> const &other)
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{
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for(int i=0; i < NUM_DWORDS; i++)
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if(m_DWords[i] != other.m_DWords[i])
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return false;
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return true;
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}
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template<int NUM_BITS>
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inline bool CBitVec<NUM_BITS>::operator!=(CBitVec<NUM_BITS> const &other)
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{
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return !(*this == other);
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}
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template<int NUM_BITS>
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inline int CBitVec<NUM_BITS>::GetNumDWords()
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{
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return NUM_DWORDS;
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}
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template<int NUM_BITS>
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inline unsigned long CBitVec<NUM_BITS>::GetDWord(int i)
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{
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assert(i >= 0 && i < NUM_DWORDS);
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return m_DWords[i];
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}
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template<int NUM_BITS>
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inline void CBitVec<NUM_BITS>::SetDWord(int i, unsigned long val)
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{
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assert(i >= 0 && i < NUM_DWORDS);
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m_DWords[i] = val;
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}
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#endif // BITVEC_H
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