/data/refman/pasoursint/CMSSW_5_3_3/src/L1Trigger/GlobalTrigger/src/L1GlobalTriggerFunctions.cc

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// this class header
#include "L1Trigger/GlobalTrigger/interface/L1GlobalTriggerFunctions.h"

// system include files

// user include files
#include "FWCore/MessageLogger/interface/MessageLogger.h"

// methods

// factorial function

int factorial(int n) {
    return (n <= 0) ? 1 : (n * factorial(n - 1));
}

// hex string to a vector of 64-bit integers
bool hexStringToInt64(const std::string& hexString,
        std::vector<unsigned long long>& vecInt64) {

    int iVec = 0;
    size_t initialPos = 0;
    unsigned long long iValue = 0ULL;

    do {

        iValue = 0ULL;

        if (stringToNumber<unsigned long long> (iValue,
                hexString.substr(initialPos, 16), std::hex)) {

            LogTrace("L1GlobalTrigger") << "\n  String " << hexString.substr(
                    initialPos, 16) << " converted to hex value 0x" << std::hex
                    << iValue << std::dec << std::endl;

            vecInt64[iVec] = iValue;
        } else {
            LogTrace("L1GlobalTrigger")
                    << "\nstringToNumber failed to convert string "
                    << hexString.substr(initialPos, 16) << std::endl;

            return false;
        }

        initialPos = +16;
        iVec++;
    } while (hexString.size() >= (initialPos + 16));

    return true;
}