141 lines
3.2 KiB
C++
141 lines
3.2 KiB
C++
#include "bitvector.h"
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//inefficient I/O operators
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ostream & operator<<(ostream &s, const bitvector &x)
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{
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for(unsigned int i=0; i<x.size(); ++i) s<< x[i];
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return s;
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}
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istream & operator>>(istream &s, bitvector &x)
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{
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bool a;
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x.copyonwrite();
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for(unsigned int i=0; i<x.size(); ++i) {s >>a; x.assign(i,a);}
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return s;
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}
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//implemented so that vectors of different length are considered different automatically
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bool bitvector::operator!=(const bitvector &rhs) const
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{
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if(nn!=rhs.nn || modulo!=rhs.modulo) return 1;
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if(v==rhs.v) return 0;
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if(!modulo) return memcmp(v,rhs.v,nn*sizeof(bitvector_block));
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if(memcmp(v,rhs.v,(nn-1)*sizeof(bitvector_block))) return 1;
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bitvector_block a=v[nn-1];
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bitvector_block b=rhs.v[nn-1];
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//zero out the irrelevant bits
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bitvector_block mask= ~((bitvector_block)0);
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mask <<=modulo;
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mask = ~mask;
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a&=mask; b&=mask;
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return a!=b;
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}
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bool bitvector::operator>(const bitvector &rhs) const
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{
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if(nn!=rhs.nn || modulo!=rhs.modulo) laerror("at the moment only bitvectors of the same length comparable");
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if(v==rhs.v) return 0;
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if(!modulo) return memcmp(v,rhs.v,nn*sizeof(bitvector_block)>0);
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int r;
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if((r=memcmp(v,rhs.v,(nn-1)*sizeof(bitvector_block)))) return r>0;
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bitvector_block a=v[nn-1];
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bitvector_block b=rhs.v[nn-1];
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//zero out the irrelevant bits
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bitvector_block mask= ~((bitvector_block)0);
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mask <<=modulo;
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mask = ~mask;
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a&=mask; b&=mask;
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return a>b;
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}
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bool bitvector::operator<(const bitvector &rhs) const
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{
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if(nn!=rhs.nn || modulo!=rhs.modulo) laerror("at the moment only bitvectors of the same length comparable");
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if(v==rhs.v) return 0;
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if(!modulo) return memcmp(v,rhs.v,nn*sizeof(bitvector_block)<0);
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int r;
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if((r=memcmp(v,rhs.v,(nn-1)*sizeof(bitvector_block)))) return r<0;
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bitvector_block a=v[nn-1];
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bitvector_block b=rhs.v[nn-1];
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//zero out the irrelevant bits
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bitvector_block mask= ~((bitvector_block)0);
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mask <<=modulo;
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mask = ~mask;
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a&=mask; b&=mask;
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return a<b;
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}
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bitvector bitvector::operator~() const
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{
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bitvector r((*this).size());
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for(int i=0; i<nn; ++i) r.v[i] = ~v[i];
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return r;
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}
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bitvector& bitvector::operator&=(const bitvector &rhs)
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{
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#ifdef DEBUG
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if(nn!=rhs.nn || modulo!=rhs.modulo) laerror("operation on incompatible bitvectors");
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#endif
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copyonwrite();
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for(int i=0; i<nn; ++i) v[i] &= rhs.v[i];
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return *this;
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}
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bitvector& bitvector::operator|=(const bitvector &rhs)
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{
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#ifdef DEBUG
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if(nn!=rhs.nn || modulo!=rhs.modulo) laerror("operation on incompatible bitvectors");
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#endif
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copyonwrite();
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for(int i=0; i<nn; ++i) v[i] |= rhs.v[i];
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return *this;
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}
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bitvector& bitvector::operator^=(const bitvector &rhs)
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{
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#ifdef DEBUG
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if(nn!=rhs.nn || modulo!=rhs.modulo) laerror("operation on incompatible bitvectors");
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#endif
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copyonwrite();
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for(int i=0; i<nn; ++i) v[i] ^= rhs.v[i];
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return *this;
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}
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/*number of ones in a binary number, from "Hacker's delight" book*/
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#ifdef LONG_IS_32
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static unsigned long word_popul(unsigned long x)
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{
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x -= ((x>>1)&0x55555555);
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x = (x&0x33333333) + ((x>>2)&0x33333333);
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x=(x + (x>>4))&0x0f0f0f0f;
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x+= (x>>8);
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x+= (x>>16);
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return x&0x3f;
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}
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#endif
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unsigned int bitvector::population(const unsigned int before) const
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{
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//@@@before
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int i;
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unsigned int s=0;
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for(i=0; i<nn-1; ++i) s+=word_popul(v[i]);
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bitvector_block a=v[nn-1];
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if(modulo)
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{
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bitvector_block mask= ~((bitvector_block)0);
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mask <<=modulo;
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a &= ~mask;
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}
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return s+word_popul(a);
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}
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