third_party/llvm-project/libcxx/test/std/time/time.point/time.point.comparisons/compare.three_way.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17

// <chrono>

// time_point

// template<class Clock, class Duration1,
//          three_way_comparable_with<Duration1> Duration2>
//   constexpr auto operator<=>(const time_point<Clock, Duration1>& lhs,
//                              const time_point<Clock, Duration2>& rhs);

#include <cassert>
#include <chrono>
#include <ratio>

#include "test_comparisons.h"

constexpr void test_with_integral_ticks_value() {
  using Clock = std::chrono::system_clock;

  using Duration1 = std::chrono::milliseconds;
  using Duration2 = std::chrono::microseconds;
  using T1        = std::chrono::time_point<Clock, Duration1>;
  using T2        = std::chrono::time_point<Clock, Duration2>;

  {
    T1 t1(Duration1(3));
    T1 t2(Duration1(3));
    assert((t1 <=> t2) == std::strong_ordering::equal);
    assert(testOrder(t1, t2, std::strong_ordering::equal));
  }
  {
    T1 t1(Duration1(3));
    T1 t2(Duration1(4));
    assert((t1 <=> t2) == std::strong_ordering::less);
    assert(testOrder(t1, t2, std::strong_ordering::less));
  }
  {
    T1 t1(Duration1(3));
    T2 t2(Duration2(3000));
    assert((t1 <=> t2) == std::strong_ordering::equal);
    assert(testOrder(t1, t2, std::strong_ordering::equal));
  }
  {
    T1 t1(Duration1(3));
    T2 t2(Duration2(3001));
    assert((t1 <=> t2) == std::strong_ordering::less);
    assert(testOrder(t1, t2, std::strong_ordering::less));
    assert((t2 <=> t1) == std::strong_ordering::greater);
    assert(testOrder(t2, t1, std::strong_ordering::greater));
  }
}

constexpr void test_with_integral_ticks_value_and_custom_period_value() {
  using Clock = std::chrono::system_clock;

  using DInt30Hz = std::chrono::duration<int, std::ratio<1, 30>>;
  using DInt60Hz = std::chrono::duration<int, std::ratio<1, 60>>;

  using TIntR1 = std::chrono::time_point<Clock, DInt30Hz>;
  using TIntR2 = std::chrono::time_point<Clock, DInt60Hz>;

  {
    TIntR1 t1(DInt30Hz(10));
    TIntR2 t2(DInt60Hz(20));
    assert((t1 <=> t2) == std::strong_ordering::equal);
    assert(testOrder(t1, t2, std::strong_ordering::equal));
  }
  {
    TIntR1 t1(DInt30Hz(10));
    TIntR2 t2(DInt60Hz(21));
    assert((t1 <=> t2) == std::strong_ordering::less);
    assert(testOrder(t1, t2, std::strong_ordering::less));
  }
  {
    TIntR1 t1(DInt30Hz(11));
    TIntR2 t2(DInt60Hz(20));
    assert((t1 <=> t2) == std::strong_ordering::greater);
    assert(testOrder(t1, t2, std::strong_ordering::greater));
  }
}

constexpr void test_with_floating_point_ticks_value() {
  using Clock = std::chrono::system_clock;

  using DF30Hz = std::chrono::duration<double, std::ratio<1, 30>>;
  using DF60Hz = std::chrono::duration<double, std::ratio<1, 60>>;
  using F1     = std::chrono::time_point<Clock, DF30Hz>;
  using F2     = std::chrono::time_point<Clock, DF60Hz>;

  // No equality comparison test for floating point values.

  {
    F1 t1(DF30Hz(3.5));
    F2 t2(DF60Hz(7.1));
    assert((t1 <=> t2) == std::weak_ordering::less);
    assert(testOrder(t1, t2, std::weak_ordering::less));
  }
  {
    F1 t1(DF30Hz(3.6));
    F2 t2(DF60Hz(7.0));
    assert((t1 <=> t2) == std::weak_ordering::greater);
    assert(testOrder(t1, t2, std::weak_ordering::greater));
  }
}

constexpr bool test() {
  test_with_integral_ticks_value();
  test_with_integral_ticks_value_and_custom_period_value();
  test_with_floating_point_ticks_value();

  return true;
}

int main(int, char**) {
  assert(test());
  static_assert(test());
  return 0;
}