feat: quantity aliases support addded

example/aliases/unknown_dimension.cpp

@@ -0,0 +1,72 @@
+// 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/isq/si/length.h>
+#include <units/isq/si/speed.h> // IWYU pragma: keep
+#include <units/isq/si/time.h>
+#include <units/quantity_io.h>
+#include <exception>
+#include <iostream>
+
+namespace {
+
+template<units::isq::Length D, units::isq::Time T>
+constexpr units::isq::Speed auto avg_speed(D d, T t)
+{
+  return d / t;
+}
+
+void example()
+{
+  using namespace units::isq;
+  using namespace units::aliases::isq::si;
+
+  Length auto d1 = m<>(123);
+  Time auto t1 = s<>(10);
+  Speed auto v1 = avg_speed(d1, t1);
+
+  auto temp1 = v1 * m<>(50);  // produces intermediate unknown dimension with 'unknown_coherent_unit' as its 'coherent_unit'
+  Speed auto v2 = temp1 / m<>(100); // back to known dimensions again
+  Length auto d2 = v2 * s<>(60);
+
+  std::cout << "d1 = " << d1 << '\n';
+  std::cout << "t1 = " << t1 << '\n';
+  std::cout << "v1 = " << v1 << '\n';
+  std::cout << "temp1 = " << temp1 << '\n';
+  std::cout << "v2 = " << v2 << '\n';
+  std::cout << "d2 = " << d2 << '\n';
+}
+
+} // namespace
+
+int main()
+{
+  try {
+    example();
+  }
+  catch (const std::exception& ex) {
+    std::cerr << "Unhandled std exception caught: " << ex.what() << '\n';
+  }
+  catch (...) {
+    std::cerr << "Unhandled unknown exception caught\n";
+  }
+}