xo-unit: compile-time constexpr unit stalking horse [wip]

utest/quantity.test.cpp

@@ -0,0 +1,30 @@
+/* @file quantity.test.cpp */
+
+#include "xo/unit/quantity.hpp"
+#include "xo/indentlog/scope.hpp"
+#include <catch2/catch.hpp>
+
+namespace xo {
+    namespace qty {
+        TEST_CASE("quantity", "[quantity]") {
+            constexpr bool c_debug_flag = true;
+
+            // can get bits from /dev/random by uncommenting the 2nd line below
+            //uint64_t seed = xxx;
+            //rng::Seed<xoshio256ss> seed;
+
+            //auto rng = xo::rng::xoshiro256ss(seed);
+
+            scope log(XO_DEBUG2(c_debug_flag, "TEST_CASE.quantity"));
+            //log && log("(A)", xtag("foo", foo));
+
+            constexpr auto g = qty::grams(1.0);
+
+            static_assert(g.scale() == 1.0);
+
+            log && log(xtag("g.abbrev", g.abbrev()));
+        } /*TEST_CASE(quantity)*/
+    } /*namespace qty*/
+} /*namespace xo*/
+
+/* end quantity.test.cpp */