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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
// The MIT License (MIT)
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//
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// Copyright (c) 2024 Chip Hogg
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <catch2/catch_test_macros.hpp>
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#ifdef MP_UNITS_IMPORT_STD
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import std;
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#else
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#include <atomic>
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#include <numbers>
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#endif
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#ifdef MP_UNITS_MODULES
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import mp_units;
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#else
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#include <mp-units/math.h>
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#include <mp-units/systems/si.h>
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#endif
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using namespace mp_units;
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using namespace mp_units::si::unit_symbols;
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namespace {
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template<typename T>
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constexpr bool within_4_ulps(T a, T b)
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{
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static_assert(std::is_floating_point_v<T>);
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auto walk_ulps = [](T x, int n) {
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while (n > 0) {
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x = std::nextafter(x, std::numeric_limits<T>::infinity());
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--n;
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}
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while (n < 0) {
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x = std::nextafter(x, -std::numeric_limits<T>::infinity());
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++n;
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}
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return x;
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};
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return (walk_ulps(a, -4) <= b) && (b <= walk_ulps(a, 4));
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}
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} // namespace
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TEST_CASE("quantity operations", "[quantity]")
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{
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// conversion requiring radical magnitudes
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SECTION("unit conversions support radical magnitudes")
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{
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REQUIRE(within_4_ulps(sqrt((1.0 * m) * (1.0 * km)).numerical_value_in(m), sqrt(1000.0)));
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}
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// Reproducing issue #474 exactly:
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SECTION("Issue 474 is fixed")
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{
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constexpr auto val_issue_474 = 8.0 * si::si2019::boltzmann_constant * 1000.0 * K / (std::numbers::pi * 10 * Da);
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REQUIRE(within_4_ulps(sqrt(val_issue_474).numerical_value_in(m / s),
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sqrt(val_issue_474.numerical_value_in(m * m / s / s))));
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}
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SECTION("Volatile representation type")
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{
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volatile std::int16_t vint = 123;
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REQUIRE(quantity(vint * m).numerical_value_in(m) == 123);
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}
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}
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