mp-units/test/unit_test/test_tools.cpp

// The MIT License (MIT)
//
// Copyright (c) 2018 Mateusz Pusz
//
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// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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#include "units/ratio.h"

namespace {

  using namespace std::experimental::units;

  template<Ratio R1, Ratio R2>
  inline constexpr bool same = R1::num == R2::num && R1::den == R2::den;

  static_assert(same<ratio<2, 4>, ratio<1, 2>>);

  static_assert(std::is_same_v<ratio_multiply<ratio<4>, ratio<1, 8>>, ratio<1, 2>>);
  static_assert(std::is_same_v<ratio_multiply<ratio<4>, ratio<1, 2>>, ratio<2>>);
  static_assert(std::is_same_v<ratio_multiply<ratio<1, 8>, ratio<2>>, ratio<1, 4>>);
  static_assert(std::is_same_v<ratio_multiply<ratio<1, 2>, ratio<8>>, ratio<4>>);

  static_assert(std::is_same_v<ratio_divide<ratio<4>, ratio<2>>, ratio<2>>);
  static_assert(std::is_same_v<ratio_divide<ratio<2>, ratio<8>>, ratio<1, 4>>);
  static_assert(std::is_same_v<ratio_divide<ratio<1, 8>, ratio<2>>, ratio<1, 16>>);
  static_assert(std::is_same_v<ratio_divide<ratio<6>, ratio<3>>, ratio<2>>);

  // common_ratio

  static_assert(std::is_same_v<common_ratio<ratio<1>, ratio<1000>>, ratio<1>>);
  static_assert(std::is_same_v<common_ratio<ratio<1000>, ratio<1>>, ratio<1>>);
  static_assert(std::is_same_v<common_ratio<ratio<1>, ratio<1, 1000>>, ratio<1, 1000>>);
  static_assert(std::is_same_v<common_ratio<ratio<1, 1000>, ratio<1>>, ratio<1, 1000>>);

}  // namespace