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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// UNSUPPORTED: c++98, c++03
// <filesystem>
// typedef TrivialClock file_time_type;
#include "filesystem_include.h"
#include <chrono>
#include <type_traits>
#include "test_macros.h"
// system_clock is used because it meets the requirements of TrivialClock,
// and the resolution and range of system_clock should match the operating
// system's file time type.
void test_trivial_clock() {
using namespace fs;
using Clock = file_time_type::clock;
ASSERT_SAME_TYPE(decltype(Clock::now()), file_time_type);
ASSERT_SAME_TYPE(Clock::time_point, file_time_type);
volatile auto* odr_use = &Clock::is_steady;
void test_time_point_resolution_and_range() {
using namespace fs;
using Dur = file_time_type::duration;
using Period = Dur::period;
ASSERT_SAME_TYPE(Period, std::nano);
int main(int, char**) {
return 0;