US system isolated from SI

test/unit_test/static/us_test.cpp

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+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <units/physical/si/area.h>
+#include <units/physical/si/length.h>
+#include <units/physical/si/velocity.h>
+#include <units/physical/si/volume.h>
+#include <units/physical/us/area.h>
+#include <units/physical/us/length.h>
+#include <units/physical/us/velocity.h>
+#include <units/physical/us/volume.h>
+#include <utility>
+
+namespace {
+
+using namespace units;
+using namespace units::si;
+using namespace units::us;
+
+/* ************** BASE DIMENSIONS **************** */
+
+// length
+
+static_assert(1yd == 0.9144m);
+static_assert(1yd == 3ft);
+static_assert(1ft == 12in);
+static_assert(1mi == 1760yd);
+
+static_assert(5in + 8cm == 207mm);
+
+
+/* ************** DERIVED DIMENSIONS IN TERMS OF BASE UNITS **************** */
+
+// velocity
+
+static_assert(10.0mi / 2h == 5mph);
+
+static_assert(mile_per_hour::symbol == "mi/h");
+
+}  // namespace