5ab1c29c
 tangwang
first commit
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#include <iostream>
#include <vector>
using namespace std;
class BitMap
{
public:
BitMap(size_t num)
{
_v.resize((num >> 5) + 1);
}
void Set(size_t num) //set 1
{
size_t index = num >> 5;
size_t pos = num & 0x1F;
_v[index] |= (1 << pos);
}
void Reset(size_t num) //set 0
{
size_t index = num >> 5;
size_t pos = num & 0x1F;
_v[index] &= ~(1 << pos);
}
//
void ResetRoughly(size_t num) //set 0
{
size_t index = num >> 5;
_v[index] = 0;
}
bool Existed(size_t num)//check whether it exists
{
size_t index = num >> 5;
size_t pos = num & 0x1F;
return (_v[index] & (1 << pos));
}
private:
vector<size_t> _v;
};
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