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          The intention of the join
          function is to join two ranges into one longer range.
        
The resultant range will have the lowest common traversal of the two ranges supplied as parameters.
Note that the joined range incurs a performance cost due to the need to check if the end of a range has been reached internally during traversal.
template<typename SinglePassRange1, typename SinglePassRange2> joined_range<const SinglePassRange1, const SinglePassRange2> join(const SinglePassRange1& rng1, const SinglePassRange2& rng2) template<typename SinglePassRange1, typename SinglePassRange2> joined_range<SinglePassRange1, SinglePassRange2> join(SinglePassRange1& rng1, SinglePassRange2& rng2);
For the const version:
range_value<SinglePassRange2>::type
              must be convertible to range_value<SinglePassRange1>::type.
              The range_reference<const
              SinglePassRange2>::type must be convertible to range_reference<const SinglePassRange1>::type.
            rng1 and rng2
              must be a model of Single
              Pass Range or better.
            joined_range<const
              SinglePassRange1,
              const SinglePassRange2> which is a model of the lesser
              of the two range concepts passed.
            rng1
              and rng2.
            For the mutable version:
range_value<SinglePassRange2>::type
              must be convertible to range_value<SinglePassRange1>::type.
              The range_reference<SinglePassRange2>::type
              must be convertible to range_reference<SinglePassRange1>::type.
            rng1 and rng2
              must be a model of Single
              Pass Range or better.
            joined_range<SinglePassRange1, SinglePassRange2> which is a model of the lesser
              of the two range concepts passed.
            rng1
              and rng2.
            
          The expression join(irange(0,5), irange(5,10)) would
          evaluate to a range representing an integer range [0,10)