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QuasiRandomSequenceIterator.h

Go to the documentation of this file.

#ifndef Impala_Util_QuasiRandomSequenceIterator_h
#define Impala_Util_QuasiRandomSequenceIterator_h

namespace Impala
{
namespace Util
{

class QuasiRandomSequenceIterator
{
public:
    QuasiRandomSequenceIterator(int length, int seed)
    {
        int i;
        for(i=0 ; i<length ; ++i)
            mSequence.push_back(i);
        mCurrent = mSequence.begin();
        mPickout = 11+(2*seed);
    }

    int operator* () const
    {
        return *mCurrent;
    }

    QuasiRandomSequenceIterator& operator++ ()
    {
        mCurrent = mSequence.erase(mCurrent);
        if(mCurrent == mSequence.end())
            mCurrent = mSequence.begin();
        if(mSequence.size() > 0)
            for(int i=mPickout ; i>0 ; --i)
            {
                ++mCurrent;
                if(mCurrent == mSequence.end())
                    mCurrent = mSequence.begin();
            }
        return *this;
    }

private:
    std::list<int> mSequence;
    int mPickout;
    std::list<int>::iterator mCurrent;
};

}//namespace Util
}//namespace Impala

#endif

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