round.pass.cpp
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//===----------------------------------------------------------------------===//
//
// 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
// <chrono>
// round
// template <class ToDuration, class Clock, class Duration>
// time_point<Clock, ToDuration>
// round(const time_point<Clock, Duration>& t);
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
template <class FromDuration, class ToDuration>
void
test(const FromDuration& df, const ToDuration& d)
{
typedef std::chrono::system_clock Clock;
typedef std::chrono::time_point<Clock, FromDuration> FromTimePoint;
typedef std::chrono::time_point<Clock, ToDuration> ToTimePoint;
{
FromTimePoint f(df);
ToTimePoint t(d);
typedef decltype(std::chrono::round<ToDuration>(f)) R;
static_assert((std::is_same<R, ToTimePoint>::value), "");
assert(std::chrono::round<ToDuration>(f) == t);
}
}
template<class FromDuration, long long From, class ToDuration, long long To>
void test_constexpr ()
{
typedef std::chrono::system_clock Clock;
typedef std::chrono::time_point<Clock, FromDuration> FromTimePoint;
typedef std::chrono::time_point<Clock, ToDuration> ToTimePoint;
{
constexpr FromTimePoint f{FromDuration{From}};
constexpr ToTimePoint t{ToDuration{To}};
static_assert(std::chrono::round<ToDuration>(f) == t, "");
}
}
int main(int, char**)
{
// 7290000ms is 2 hours, 1 minute, and 30 seconds
test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
test(std::chrono::milliseconds(-7290000), std::chrono::hours(-2));
test(std::chrono::milliseconds( 7290000), std::chrono::minutes( 122));
test(std::chrono::milliseconds(-7290000), std::chrono::minutes(-122));
// 9000000ms is 2 hours and 30 minutes
test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::hours, 2> ();
test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::hours, -2> ();
test_constexpr<std::chrono::milliseconds, 9000001, std::chrono::minutes, 150> ();
test_constexpr<std::chrono::milliseconds,-9000001, std::chrono::minutes,-150> ();
test_constexpr<std::chrono::milliseconds, 9000000, std::chrono::seconds, 9000> ();
test_constexpr<std::chrono::milliseconds,-9000000, std::chrono::seconds,-9000> ();
return 0;
}