82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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>
|
|
|
|
// template <class Duration>
|
|
// class hh_mm_ss
|
|
// {
|
|
// public:
|
|
// static unsigned constexpr fractional_width = see below;
|
|
// using precision = see below;
|
|
//
|
|
// precision is duration<common_type_t<Duration::rep, seconds::rep>,
|
|
// ratio<1, 10^^fractional_width>>
|
|
|
|
#include <chrono>
|
|
#include <cassert>
|
|
#include <ratio>
|
|
#include <type_traits>
|
|
|
|
#include "test_macros.h"
|
|
|
|
constexpr unsigned long long powers[] = {
|
|
1ULL,
|
|
10ULL,
|
|
100ULL,
|
|
1000ULL,
|
|
10000ULL,
|
|
100000ULL,
|
|
1000000ULL,
|
|
10000000ULL,
|
|
100000000ULL,
|
|
1000000000ULL,
|
|
10000000000ULL,
|
|
100000000000ULL,
|
|
1000000000000ULL,
|
|
10000000000000ULL,
|
|
100000000000000ULL,
|
|
1000000000000000ULL,
|
|
10000000000000000ULL,
|
|
100000000000000000ULL,
|
|
1000000000000000000ULL,
|
|
10000000000000000000ULL
|
|
};
|
|
|
|
template <typename Duration, unsigned width>
|
|
constexpr bool check_precision()
|
|
{
|
|
using HMS = std::chrono::hh_mm_ss<Duration>;
|
|
using CT = std::common_type_t<typename Duration::rep, std::chrono::seconds::rep>;
|
|
using Pre = std::chrono::duration<CT, std::ratio<1, powers[width]>>;
|
|
return std::is_same_v<typename HMS::precision, Pre>;
|
|
}
|
|
|
|
int main(int, char**)
|
|
{
|
|
using microfortnights = std::chrono::duration<int, std::ratio<756, 625>>;
|
|
|
|
static_assert( check_precision<std::chrono::hours, 0>(), "");
|
|
static_assert( check_precision<std::chrono::minutes, 0>(), "");
|
|
static_assert( check_precision<std::chrono::seconds, 0>(), "");
|
|
static_assert( check_precision<std::chrono::milliseconds, 3>(), "");
|
|
static_assert( check_precision<std::chrono::microseconds, 6>(), "");
|
|
static_assert( check_precision<std::chrono::nanoseconds, 9>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 2>>, 1>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 3>>, 6>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 4>>, 2>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 5>>, 1>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 6>>, 6>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 7>>, 6>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 8>>, 3>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 9>>, 6>(), "");
|
|
static_assert( check_precision<std::chrono::duration<int, std::ratio< 1, 10>>, 1>(), "");
|
|
static_assert( check_precision<microfortnights, 4>(), "");
|
|
|
|
return 0;
|
|
}
|