MvdOfflineTBAnalysis_Topix4/mrftools.cxx

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/*============================================================*/
/* mrftools.cpp                                               */
/* Toolbox                                                    */
/*                                               M.C. Mertens */
/*============================================================*/


#include "mrftools.h"
#include <climits>

namespace mrftools {

static const UInt_t UInt_t_bitlength = sizeof(UInt_t) * CHAR_BIT;

bool getIntBit(const UInt_t& position, const UInt_t& value)
{
        if (position < UInt_t_bitlength) {
                return (value & (1 << position));
        }
        else {
                return false;
        }
}

void setIntBit(const UInt_t& position, UInt_t& value, const bool& state)
{
        if (position < UInt_t_bitlength) {
                if (state) {
                        value |= (1 << position);
                }
                else {
                        value &= (~(1 << position));
                }
        }
}

UInt_t shiftBy(const int& positions, const UInt_t& value)
{
        if (positions < 0) {
                return (value >> (-positions));
        }
        else if (positions > 0) {
                return (value << positions);
        }
        else {
                return value;
        }
}

unsigned int getIteratorItemCount(const std::map<std::string, TConfItem>::const_iterator& start, const std::map<std::string, TConfItem>::const_iterator& stop)
{
        std::map<std::string, TConfItem>::const_iterator iter;
        unsigned int count = 0;
        for (iter = start; iter != stop; ++iter) {
                ++count;
        }
        return count;
}

unsigned int getIteratorItemCount(const std::map<std::string,std::map<std::string,TConfItem> >::const_iterator& start, const std::map<std::string,std::map<std::string,TConfItem> >::const_iterator& stop)
{
        unsigned int count = 0;
        std::map<std::string, std::map<std::string, TConfItem> >::const_iterator iter;
        std::map<std::string,TConfItem>::const_iterator iter2;
        for (iter=start; iter!=stop; ++iter) {
        for (iter2 = iter->second.begin(); iter2 != iter->second.end(); ++iter2) {
                    ++count;
            }
        }
        return count;
}

UInt_t grayToBin(UInt_t gray)
{
        //UInt_t result = 0;
        //setIntBit(31, result, getIntBit(31, gray));
        //for (unsigned int i = 30; i > 0; --i) {
        //        setIntBit(i, result, (getIntBit(i+1, result) && !(getIntBit(i, gray))) || (!(getIntBit(i+1, result)) && getIntBit(i, gray)));
        //}
        //setIntBit(0, result, (getIntBit(1, result) && !(getIntBit(0, gray))) || (!(getIntBit(1, result)) && getIntBit(0, gray)));

    //return result;

        for (UInt_t bit = 1U << 31; bit > 1; bit >>= 1)
        {
                if (gray & bit) gray ^= bit >> 1;
        }
        return gray;
}

}