Added l2Norm function

src/algebra/TinyVector.hpp

@@ -238,4 +238,12 @@ public:
   }
 };
 
+template <size_t N, typename T>
+KOKKOS_INLINE_FUNCTION
+T l2Norm(const TinyVector<N,T>& x)
+{
+  static_assert(std::is_arithmetic<T>(),"Cannot compute L2 norm for non-arithmetic types");
+  return std::sqrt((x,x));
+}
+
 #endif // TINYVECTOR_HPP