1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
//===----------------------------------------------------------------------===//
//
// 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, 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 "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;
}
|
