xo-unit: + constexpr implementation (runtime+compiletime)

include/xo/unit/unit2.hpp

@@ -0,0 +1,24 @@
+/** @file unit2.hpp
+ *
+ *  Author: Roland Conybeare
+ **/
+
+#pragma once
+
+#include "natural_unit.hpp"
+
+namespace xo {
+    namespace unit {
+        /** @class unit2
+         *  @brief represent an arbitrary unit along with dimension details
+         *
+         *  For example,
+         *    kg.m.s^-2 or
+         *    (kilogram * meter) / (second * second)
+         **/
+        template <typename Int>
+        using unit2 = natural_unit<Int>;
+    } /*namespace unit*/
+} /*namespace xo*/
+
+/** end unit2.hpp **/