[Lua] Bit Flag

function GetBitFlag(index)
     if (0 >= index) then
          return -1
     end

     local bitFlag = 1 << (index - 1)
     return bitFlag
end

function SetBitFlag(targetFlag, index)
     local result = CheckWeekBitFlag(targetFlag, index)
     if (0 ~= result) then
          return targetFlag     --!< 이미 Flag 값 되어 있음.
     end

     local bitFlag = GetWeekBitFlag(index)
     if (0 > bitFlag) then
          return 0
     end

     local resultBitFlag = targetFlag + bitFlag
     return resultBitFlag
end

function CheckBitFlag(targetFlag, index)
     local checkBitFlag = GetBitFlag(index)
     if (0 > checkBitFlag) then
          return 0
     end

     if (targetFlag & checkBitFlag) == 0 then
          return 0
     end

     return 1
end