+/** Returns true if axis is continuous or false.
+
+ See is_continuous for details.
+
+ @param axis any axis instance
+*/
+template <class Axis>
+constexpr bool continuous(const Axis& axis) noexcept {
+ (void)axis;
+ return is_continuous<Axis>::value;
+}
+
+// specialization for variant
+template <class... Ts>
+bool continuous(const variant<Ts...>& axis) noexcept {
+ return axis.continuous();
+}
+