Passing range by ref (&) is fine, but using (&&) results in and error. Any ideas?
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When you pass by T&&, the deduced type of T will include the reference. (So e.g. if you have a T&& argument and you pass in an int rvalue, T will be deduced as 'const int&'. If you pass an int lvalue, T will be deduced as 'int&'. This is in contrast to a regular reference, like T&, where if you pass an int lvalue, T will be deduced as just 'int'). Range metafunctions don't accept references to range types as their input; you must pass the range type itself. So, you must call remove_reference<> on the deduced type 'T' prior to passing it to a range metafunction. I wonder if we should change the range metafunctions to accept references to range types, and do the reference stripping themselves? Regards, Nate