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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/*
* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_UNITS_TIME_DELTA_H_
#define API_UNITS_TIME_DELTA_H_
#ifdef WEBRTC_UNIT_TEST
#include <ostream> // no-presubmit-check TODO(webrtc:8982)
#endif // WEBRTC_UNIT_TEST
#include <cstdlib>
#include <string>
#include <type_traits>
#include "rtc_base/units/unit_base.h" // IWYU pragma: export
namespace webrtc {
// TimeDelta represents the difference between two timestamps. Commonly this can
// be a duration. However since two Timestamps are not guaranteed to have the
// same epoch (they might come from different computers, making exact
// synchronisation infeasible), the duration covered by a TimeDelta can be
// undefined. To simplify usage, it can be constructed and converted to
// different units, specifically seconds (s), milliseconds (ms) and
// microseconds (us).
class TimeDelta final : public rtc_units_impl::RelativeUnit<TimeDelta> {
public:
template <typename T>
static constexpr TimeDelta Minutes(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return Seconds(value * 60);
}
template <typename T>
static constexpr TimeDelta Seconds(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromFraction(1'000'000, value);
}
template <typename T>
static constexpr TimeDelta Millis(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromFraction(1'000, value);
}
template <typename T>
static constexpr TimeDelta Micros(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromValue(value);
}
TimeDelta() = delete;
template <typename T = int64_t>
constexpr T seconds() const {
return ToFraction<1000000, T>();
}
template <typename T = int64_t>
constexpr T ms() const {
return ToFraction<1000, T>();
}
template <typename T = int64_t>
constexpr T us() const {
return ToValue<T>();
}
template <typename T = int64_t>
constexpr T ns() const {
return ToMultiple<1000, T>();
}
constexpr int64_t seconds_or(int64_t fallback_value) const {
return ToFractionOr<1000000>(fallback_value);
}
constexpr int64_t ms_or(int64_t fallback_value) const {
return ToFractionOr<1000>(fallback_value);
}
constexpr int64_t us_or(int64_t fallback_value) const {
return ToValueOr(fallback_value);
}
constexpr TimeDelta Abs() const {
return us() < 0 ? TimeDelta::Micros(-us()) : *this;
}
private:
friend class rtc_units_impl::UnitBase<TimeDelta>;
using RelativeUnit::RelativeUnit;
static constexpr bool one_sided = false;
};
std::string ToString(TimeDelta value);
inline std::string ToLogString(TimeDelta value) {
return ToString(value);
}
#ifdef WEBRTC_UNIT_TEST
inline std::ostream& operator<<( // no-presubmit-check TODO(webrtc:8982)
std::ostream& stream, // no-presubmit-check TODO(webrtc:8982)
TimeDelta value) {
return stream << ToString(value);
}
#endif // WEBRTC_UNIT_TEST
} // namespace webrtc
#endif // API_UNITS_TIME_DELTA_H_
|
