布隆过滤器与位图

代码

第一个是位图，第二个是布隆过滤器，第三个 Twobitmap,是能表示4个状态的位图，因为普通位图一个位只能表示一个状态。

ifndef _BITMAP_H
#define _BITMAP_H
#include<vector>
#include<iostream>
#include<assert.h>
using namespace std;
class bitmap
{
public:
    bitmap()
        :_bitmap(((unsigned)- >> ) + )
    {}
    void Set(size_t x)
    {
        size_t index = x/;
        size_t pos = x%;
        try
        {
            _bitmap.at(index)|=(<<pos);
        }
        catch (const std::out_of_range& err)
                 std::cerr<<"Out of Range error:"<<err.what()<<endl;
        }
    }
    void UnSet(size_t x)
    {
        size_t index = x/;
        size_t pos = x%;
        try
        {
            _bitmap.at(index)&=(~(<<pos));
        }
        catch (const std::out_of_range& err)
        {
            std::cerr<<"Out of Range error:"<<err.what()<<endl;
        }
    }
    bool Test(size_t x)
    {
        size_t index = x/;
        size_t pos = x%;
        try
                try
        {
            return _bitmap.at(index)&(<<pos);
        }
        catch (const std::out_of_range& err)
        {
            std::cerr<<"Out of Range error:"<<err.what()<<endl;
        }
        assert(false);
    }

private:
    std::vector<unsigned char> _bitmap;
};
class TwoBitMap
{
public:
    TwoBitMap()
            :_bits(((unsigned)- >> )* + )
    {

    }
    int GetCount(size_t x)
    {
        int index = x / ;
        int bitpos = x % ;
        return (_bits[index] & ( << bitpos * )) >> ( * bitpos);
    }
    void Add(size_t x)
    {
        int nums = GetCount(x);
        if (x < )
        {
            int index = x / ;
            int bitpos = x % ;
            _bits[index] += ( <<  * bitpos);
                     }
    }
private:
    vector<unsigned char>_bits;
};
template<class K,class HashFunc,class HashFunc2,class HashFunc3,class HashFunc4,class HashFunc5>
class BloomFile
{
  public:
      BloomFile()
          :_bitmap()
      {}
      void Set(const K & key )
      {
            size_t index = HashFunc()(key);
            _bitmap.Set(index);
            index = HashFunc2()(key);
            _bitmap.Set(index);
            index = HashFunc3()(key);
            _bitmap.Set(index);
            index = HashFunc4()(key);
            _bitmap.Set(index);
            index = HashFunc5()(key);
            _bitmap.Set(index);
      }
      bool Test(const K&key)
      {
          size_t index = ;
          index = HashFunc()(key);
          if(!_bitmap.Test(index))
              return false;
          index = HashFunc2()(key);
          if(!_bitmap.Test(index))
              return false;
          index = HashFunc3()(key);
          if(!_bitmap.Test(index))
              return false;
          index = HashFunc4()(key);
          if(!_bitmap.Test(index))
              return false;
          index = HashFunc5()(key);
          if(!_bitmap.Test(index))
              return false;
          return true;
      }
  protected:
    bitmap _bitmap;
};