c++11 Template metaprogramming - Undefinned reference compile proble

i am tryng to implement a range selector,using template metaprogramming for de range unit ; but i am getting stuck with a compile time error. I now that an error like undefinned reference is because the linker it not seeing a variable, so eventually a move that variable to an namespace , it first create and then it resolve the conflict. but in this case, i cannot do that , i need that tuple definned in that order, initialized by templates arguments. Here is the code:

#include <iostream>
#include <tuple>
namespace NSIndexSelector
{
  namespace variables
  {
  }
    template<typename OutPutValueType,typename IndexValueType,const IndexValueType BEGIN_VALUE, const IndexValueType END_VALUE,unsigned RANGE_INDEX>
    class RangeUnit
    {
      static constexpr unsigned NOT_IN_RANGE=100;
      static constexpr std::tuple<IndexValueType,IndexValueType> tuplaRange{BEGIN_VALUE,END_VALUE};

        public:
        RangeUnit()
        {}
        static bool isInRange(const IndexValueType aIndexValue, unsigned & aIndexRange)
        {
            bool result=false;
            std::get<static_cast<unsigned>(TupleIndex::First)>(tuplaRange);
            //result=((std::get<TupleIndex::First>(tuplaRange))<aIndexValue && aIndexValue<(std::get<TupleIndex::First>(tuplaRange)));
            aIndexRange=(result?RANGE_INDEX:NOT_IN_RANGE);
            return result;
        }
        private:
        enum class TupleIndex
        {
            First,
            Last
        };


    };
}

int main()
{
  static constexpr unsigned InitialValue=0;
  static constexpr unsigned LastValue=10;
  static constexpr unsigned RANGE_INDEX=1;
  NSIndexSelector::RangeUnit<unsigned,unsigned,InitialValue,LastValue,RANGE_INDEX> RangeUnit;

  unsigned aRangeValue=0U;
  unsigned aIndexValue=11;
  NSIndexSelector::RangeUnit<unsigned,unsigned,InitialValue,LastValue,RANGE_INDEX>::isInRange(aIndexValue,aRangeValue);

  return 0;
}

I am a little bit tired by this hours, and i cannot see where is the error. Thx in advance,! Question: I have an undefinned refence to std::tuple<> ..., but how do i initialize the variable before it is called?, i have already try to init outside the class.