xo-unit: + constexpr unit b/blocks (wip)

include/xo/unit/dim_util2.hpp

@@ -0,0 +1,51 @@
+/** @file dim_util2.hpp
+ *
+ *  Author: Roland Conybeare
+ **/
+
+#pragma once
+
+#include "dim_util.hpp"
+#include "xo/flatstring/flatstring.hpp"
+
+namespace xo {
+    namespace unit {
+        using native_unit2_abbrev_type = flatstring<8>;
+
+        /** @class native_unit2
+         *
+         *  @brief Represent a native (built-in) unit.
+         *
+         *  A basis_unit2 is expressed as a multiple of a native_unit2
+         *
+         **/
+        struct native_unit2 {
+        public:
+            constexpr native_unit2(dim native_dim,
+                                   const native_unit2_abbrev_type & abbrev_str)
+                : native_dim_{native_dim},
+                  abbrev_str_{abbrev_str}
+                {}
+
+            constexpr dim native_dim() const { return native_dim_; }
+            constexpr const native_unit2_abbrev_type & abbrev_str() const { return abbrev_str_; }
+
+        private:
+            dim native_dim_;
+            native_unit2_abbrev_type abbrev_str_;
+        };
+
+        static constexpr native_unit2 native_unit2_v[n_dim] = {
+            native_unit2(dim::mass,     native_unit2_abbrev_type::from_chars("g")),
+            native_unit2(dim::distance, native_unit2_abbrev_type::from_chars("m")),
+            native_unit2(dim::time,     native_unit2_abbrev_type::from_chars("s")),
+            native_unit2(dim::currency, native_unit2_abbrev_type::from_chars("ccy")),
+            native_unit2(dim::price,    native_unit2_abbrev_type::from_chars("px")),
+        };
+
+    } /*namespace unit*/
+} /*namespace xo*/
+
+
+
+/** end dim_util2.hpp **/