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++98, c++03, c++11, c++14
// <chrono>
// round
// template <class ToDuration, class Rep, class Period>
// constexpr
// ToDuration
// ceil(const duration<Rep, Period>& d);
#include <chrono>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
template <class ToDuration, class FromDuration>
void
test(const FromDuration& f, const ToDuration& d)
{
{
typedef decltype(std::chrono::round<ToDuration>(f)) R;
static_assert((std::is_same<R, ToDuration>::value), "");
assert(std::chrono::round<ToDuration>(f) == d);
}
}
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
constexpr std::chrono::hours h1 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(9000000));
static_assert(h1.count() == 2, "");
constexpr std::chrono::hours h2 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(-9000000));
static_assert(h2.count() == -2, "");
}
return 0;
}