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template <typename T>
constexpr T my_pi = T(3.1415926535897932385L); // variable template
template <> constexpr char my_pi<char> = '3'; // variable template specialization
template <typename T>
struct Wrapper {
template <typename U> static constexpr U my_const = U(1);
// Variable template partial specialization with member variable.
template <typename U> static constexpr U *my_const<const U *> = (U *)(0);
};
constexpr char a[] = "hello";
template <> template <>
constexpr const char *Wrapper<float>::my_const<const char *> = a;
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