feat: unit_constants

2020-12-28 12:20:54 +01:00
parent 0fb821a392
commit 8dede0db9f
70 changed files with 1000 additions and 28 deletions
@@ -0,0 +1,85 @@
+// 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/external/hacks.h"
+#include "units/physical/dimensions/length.h"
+#include "units/physical/dimensions/speed.h"
+#include "units/physical/si/base/length.h"
+#include "units/physical/si/base/mass.h"
+#include "units/physical/si/base/time.h"
+#include "units/physical/si/derived/area.h"
+#include "units/physical/si/derived/speed.h"
+#include <cassert>
+#include <cstdint>
+#include <type_traits>
+
+#if defined(COMP_MSVC)
+#pragma warning( disable : 4459 ) // Disable shadowing warning.
+#endif
+
+using namespace units::physical;
+using namespace si;
+using namespace unit_constants;
+
+static_assert(2 * m == 2_q_m);
+static_assert(2 * s == 2_q_s);
+#if !defined(COMP_MSVC) || defined(NDEBUG)
+static_assert([]<auto& s = ::s>() {
+  assert(!requires { s / 2; });
+  assert(!requires { s * 2; });
+  assert(!requires { s + 2; });
+  assert(!requires { s + s; });
+  return 1_q_s + s == 2_q_s;
+}());
+#endif
+
+constexpr auto m_per_s = m / s;
+
+static_assert(2_q_m / s == 2_q_m_per_s);
+static_assert(2 * m / s == 2_q_m_per_s);
+static_assert(2 / s * m == 2_q_m_per_s);
+static_assert(2 * (m / s) == 2_q_m_per_s);
+static_assert(2 * ::m_per_s == 2_q_m_per_s);
+static_assert(std::is_same_v<decltype(::m_per_s)::rep, decltype(m)::rep>);
+
+static_assert(120 * km / (2 * h) == 60_q_km_per_h);
+static_assert(120 * km / 2 / h == 60_q_km_per_h);
+static_assert([] {
+  const auto length{120};
+  const auto duration{2};
+  return length * km / (duration * h);
+}() == 60_q_km_per_h);
+static_assert(std::is_same_v<decltype(std::int64_t{120} * km / (2 * h)), decltype(60_q_km_per_h)>);
+static_assert(std::is_same_v<decltype(std::int64_t{120} * km / 2 / h), decltype(60_q_km_per_h)>);
+static_assert(std::is_same_v<decltype(120.L * km / 2 / h), decltype(60._q_km_per_h)>);
+
+static_assert(1. / 4 * m2 == 1._q_m2 / 4);
+
+static_assert([] {
+  Speed auto v0 = 10 * m / s;
+  signed s = 2;  // hides  ^
+  Length auto v = 20 * m / s;
+  /*      */ v0 = 10 * m / ::s;
+  return !std::is_same_v<decltype(v0), decltype(v)>;
+}());
+
+int main() {}