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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // Time represents an absolute point in coordinated universal time (UTC), | 5 // Time represents an absolute point in coordinated universal time (UTC), |
6 // internally represented as microseconds (s/1,000,000) since the Windows epoch | 6 // internally represented as microseconds (s/1,000,000) since the Windows epoch |
7 // (1601-01-01 00:00:00 UTC). System-dependent clock interface routines are | 7 // (1601-01-01 00:00:00 UTC). System-dependent clock interface routines are |
8 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump | 8 // defined in time_PLATFORM.cc. Note that values for Time may skew and jump |
9 // around as the operating system makes adjustments to synchronize (e.g., with | 9 // around as the operating system makes adjustments to synchronize (e.g., with |
10 // NTP servers). Thus, client code that uses the Time class must account for | 10 // NTP servers). Thus, client code that uses the Time class must account for |
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123 | 123 |
124 // Converts an integer value representing TimeDelta to a class. This is used | 124 // Converts an integer value representing TimeDelta to a class. This is used |
125 // when deserializing a |TimeDelta| structure, using a value known to be | 125 // when deserializing a |TimeDelta| structure, using a value known to be |
126 // compatible. It is not provided as a constructor because the integer type | 126 // compatible. It is not provided as a constructor because the integer type |
127 // may be unclear from the perspective of a caller. | 127 // may be unclear from the perspective of a caller. |
128 static TimeDelta FromInternalValue(int64_t delta) { return TimeDelta(delta); } | 128 static TimeDelta FromInternalValue(int64_t delta) { return TimeDelta(delta); } |
129 | 129 |
130 // Returns the maximum time delta, which should be greater than any reasonable | 130 // Returns the maximum time delta, which should be greater than any reasonable |
131 // time delta we might compare it to. Adding or subtracting the maximum time | 131 // time delta we might compare it to. Adding or subtracting the maximum time |
132 // delta to a time or another time delta has an undefined result. | 132 // delta to a time or another time delta has an undefined result. |
133 static TimeDelta Max(); | 133 static constexpr TimeDelta Max(); |
134 | 134 |
135 // Returns the internal numeric value of the TimeDelta object. Please don't | 135 // Returns the internal numeric value of the TimeDelta object. Please don't |
136 // use this and do arithmetic on it, as it is more error prone than using the | 136 // use this and do arithmetic on it, as it is more error prone than using the |
137 // provided operators. | 137 // provided operators. |
138 // For serializing, use FromInternalValue to reconstitute. | 138 // For serializing, use FromInternalValue to reconstitute. |
139 int64_t ToInternalValue() const { return delta_; } | 139 int64_t ToInternalValue() const { return delta_; } |
140 | 140 |
141 // Returns the magnitude (absolute value) of this TimeDelta. | 141 // Returns the magnitude (absolute value) of this TimeDelta. |
142 TimeDelta magnitude() const { | 142 TimeDelta magnitude() const { |
143 // Some toolchains provide an incomplete C++11 implementation and lack an | 143 // Some toolchains provide an incomplete C++11 implementation and lack an |
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664 constexpr TimeDelta TimeDelta::FromMillisecondsD(double ms) { | 664 constexpr TimeDelta TimeDelta::FromMillisecondsD(double ms) { |
665 return FromDouble(ms * Time::kMicrosecondsPerMillisecond); | 665 return FromDouble(ms * Time::kMicrosecondsPerMillisecond); |
666 } | 666 } |
667 | 667 |
668 // static | 668 // static |
669 constexpr TimeDelta TimeDelta::FromMicroseconds(int64_t us) { | 669 constexpr TimeDelta TimeDelta::FromMicroseconds(int64_t us) { |
670 return TimeDelta(us); | 670 return TimeDelta(us); |
671 } | 671 } |
672 | 672 |
673 // static | 673 // static |
| 674 constexpr TimeDelta TimeDelta::Max() { |
| 675 return TimeDelta(std::numeric_limits<int64_t>::max()); |
| 676 } |
| 677 |
| 678 // static |
674 constexpr TimeDelta TimeDelta::FromDouble(double value) { | 679 constexpr TimeDelta TimeDelta::FromDouble(double value) { |
675 // TODO(crbug.com/612601): Use saturated_cast<int64_t>(value) once we sort out | 680 // TODO(crbug.com/612601): Use saturated_cast<int64_t>(value) once we sort out |
676 // the Min() behavior. | 681 // the Min() behavior. |
677 return value > std::numeric_limits<int64_t>::max() | 682 return value > std::numeric_limits<int64_t>::max() |
678 ? Max() | 683 ? Max() |
679 : value < -std::numeric_limits<int64_t>::max() | 684 : value < -std::numeric_limits<int64_t>::max() |
680 ? -Max() | 685 ? -Max() |
681 : TimeDelta(static_cast<int64_t>(value)); | 686 : TimeDelta(static_cast<int64_t>(value)); |
682 } | 687 } |
683 | 688 |
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851 static void WaitUntilInitializedWin(); | 856 static void WaitUntilInitializedWin(); |
852 #endif | 857 #endif |
853 }; | 858 }; |
854 | 859 |
855 // For logging use only. | 860 // For logging use only. |
856 BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks); | 861 BASE_EXPORT std::ostream& operator<<(std::ostream& os, ThreadTicks time_ticks); |
857 | 862 |
858 } // namespace base | 863 } // namespace base |
859 | 864 |
860 #endif // BASE_TIME_TIME_H_ | 865 #endif // BASE_TIME_TIME_H_ |
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