template fails to compile: 'double' is not a valid type for a template constant parameter

Question

template<typename T, T Min>
class LowerBoundedType {};
template<typename T> class vectorelement {};
template<> class vectorelement<Categorical> { typedef LowerBoundedType<double, 0.0> type; };

with error:

 error: 'double' is not a valid type for a template constant parameter

Answer 1

The only numeric types valid for a nontype template parameter are integers and enumerations. So, you can't have a nontype template parameter of type double.