fix: add quantity_point::origin, like std::chrono::time_point::clock

test/unit_test/static/point_origin_test.cpp

@@ -0,0 +1,73 @@
+// 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/bits/equivalent.h>
+#include <units/chrono.h>
+#include <units/kind.h>
+#include <units/quantity_point.h>
+#include <units/isq/si/length.h>
+#include <units/isq/si/cgs/length.h>
+
+using namespace units;
+namespace si = isq::si;
+
+namespace {
+
+struct width : kind<width, si::dim_length> {};
+
+struct ones_viewpoint1 : point_origin<si::dim_length> {
+  template<typename D>
+  using rebind = ones_viewpoint1;
+};
+
+struct ones_viewpoint2 : point_origin<si::cgs::dim_length> {
+  template<typename D>
+  using rebind = ones_viewpoint1;
+};
+
+static_assert(PointOrigin<dynamic_origin<si::dim_length>>);
+static_assert(!PointOrigin<point_origin<si::dim_length>>);
+static_assert(!PointOrigin<width>);
+static_assert(!PointOrigin<point_kind<struct abscissa, width>>);
+
+static_assert(RebindablePointOriginFor<dynamic_origin<si::dim_length>, si::dim_length>);
+static_assert(is_same_v<rebind_point_origin_dimension<dynamic_origin<si::dim_length>, si::dim_length>,
+                        dynamic_origin<si::dim_length>>);
+static_assert(RebindablePointOriginFor<dynamic_origin<si::dim_length>, si::dim_time>);
+static_assert(is_same_v<rebind_point_origin_dimension<dynamic_origin<si::dim_length>, si::dim_time>,
+                        dynamic_origin<si::dim_time>>);
+static_assert(RebindablePointOriginFor<ones_viewpoint1, si::dim_length>);
+static_assert(is_same_v<rebind_point_origin_dimension<ones_viewpoint1, si::dim_length>, ones_viewpoint1>);
+static_assert(RebindablePointOriginFor<ones_viewpoint2, si::dim_length>);
+static_assert(is_same_v<rebind_point_origin_dimension<ones_viewpoint2, si::dim_length>, ones_viewpoint1>);
+static_assert(RebindablePointOriginFor<ones_viewpoint2, si::cgs::dim_length>);
+static_assert(is_same_v<rebind_point_origin_dimension<ones_viewpoint2, si::cgs::dim_length>, ones_viewpoint2>);
+static_assert(!RebindablePointOriginFor<ones_viewpoint1, si::cgs::dim_length>);
+
+static_assert(equivalent<dynamic_origin<si::dim_time>, dynamic_origin<si::dim_time>>);
+static_assert(equivalent<dynamic_origin<si::dim_length>, dynamic_origin<si::cgs::dim_length>>);
+static_assert(!equivalent<dynamic_origin<si::dim_time>, clock_origin<std::chrono::system_clock>>);
+static_assert(!equivalent<clock_origin<std::chrono::steady_clock>, clock_origin<std::chrono::system_clock>>);
+static_assert(!equivalent<dynamic_origin<si::dim_time>, dynamic_origin<si::dim_length>>);
+static_assert(!equivalent<ones_viewpoint1, ones_viewpoint2>);
+
+}  // namespace