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Differential D49774 Diff 157349 test/std/experimental/filesystem/fs.filesystem.synopsis/file_time_type.pass.cpp

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	// <experimental/filesystem>			// <experimental/filesystem>

	// typedef TrivialClock file_time_type;			// typedef TrivialClock file_time_type;

	#include "filesystem_include.hpp"			#include "filesystem_include.hpp"
	#include <chrono>			#include <chrono>
	#include <type_traits>			#include <type_traits>

				#include "test_macros.h"

	// system_clock is used because it meets the requirements of TrivialClock,			// system_clock is used because it meets the requirements of TrivialClock,
	// and the resolution and range of system_clock should match the operating			// and the resolution and range of system_clock should match the operating
	// system's file time type.			// system's file time type.
	typedef std::chrono::system_clock ExpectedClock;
	typedef std::chrono::time_point<ExpectedClock> ExpectedTimePoint;			void test_trivial_clock() {
				using namespace fs;
				using Clock = file_time_type::clock;
				ASSERT_NOEXCEPT(Clock::now());
				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)odr_use);
				}

				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 main() {
	static_assert(std::is_same<			test_trivial_clock();
	fs::file_time_type,			test_time_point_resolution_and_range();
	ExpectedTimePoint
	>::value, "");
	}			}