Class AddConstToPointer

develop/matchit/patterns.h:218–223

        template <typename T>
        struct AddConstToPointer
        {
            using type = std::conditional_t<
                !std::is_pointer_v<T>, T,
                std::add_pointer_t<std::add_const_t<std::remove_pointer_t<T>>>>;
        };
        template <typename T>
        using AddConstToPointerT = typename AddConstToPointer<T>::type;