| /* |
| * Copyright 2016 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 WEBRTC_BASE_TIMEDELTA_H_ |
| #define WEBRTC_BASE_TIMEDELTA_H_ |
| |
| #include "webrtc/base/basictypes.h" |
| #include "webrtc/base/timeutils.h" |
| |
| // Convenience class to convert between different units of relative time. |
| // Stores time to precision of nanoseconds, as int64_t internally. |
| // Doesn't check for overflow/underflow. |
| // |
| // Based on TimeDelta in: |
| // https://code.google.com/p/chromium/codesearch#chromium/src/base/time/time.h |
| namespace rtc { |
| |
| class TimeDelta { |
| public: |
| TimeDelta() : delta_(0) {} |
| |
| // Converts units of time to TimeDeltas. |
| static constexpr TimeDelta FromSeconds(int64_t secs) { |
| return TimeDelta(secs * kNumNanosecsPerSec); |
| } |
| static constexpr TimeDelta FromMilliseconds(int64_t ms) { |
| return TimeDelta(ms * kNumNanosecsPerMillisec); |
| } |
| static constexpr TimeDelta FromMicroseconds(int64_t us) { |
| return TimeDelta(us * kNumNanosecsPerMicrosec); |
| } |
| static constexpr TimeDelta FromNanoseconds(int64_t ns) { |
| return TimeDelta(ns); |
| } |
| |
| // Returns true if the time delta is zero. |
| bool is_zero() const { return delta_ == 0; } |
| |
| // Converts TimeDelta to units of time. |
| int64_t ToSeconds() const { return delta_ / kNumNanosecsPerSec; } |
| int64_t ToMilliseconds() const { return delta_ / kNumNanosecsPerMillisec; } |
| int64_t ToMicroseconds() const { return delta_ / kNumNanosecsPerMicrosec; } |
| int64_t ToNanoseconds() const { return delta_; } |
| |
| TimeDelta& operator=(TimeDelta other) { |
| delta_ = other.delta_; |
| return *this; |
| } |
| |
| // Computations with other deltas. |
| TimeDelta operator+(TimeDelta other) const { |
| return TimeDelta(delta_ + other.delta_); |
| } |
| TimeDelta operator-(TimeDelta other) const { |
| return TimeDelta(delta_ + other.delta_); |
| } |
| |
| TimeDelta& operator+=(TimeDelta other) { return *this = (*this + other); } |
| TimeDelta& operator-=(TimeDelta other) { return *this = (*this - other); } |
| TimeDelta operator-() const { return TimeDelta(-delta_); } |
| |
| // Computations with numeric types. |
| template <typename T> |
| TimeDelta operator*(T a) const { |
| return TimeDelta(delta_ * a); |
| } |
| template <typename T> |
| TimeDelta operator/(T a) const { |
| return TimeDelta(delta_ / a); |
| } |
| template <typename T> |
| TimeDelta& operator*=(T a) { |
| return *this = (*this * a); |
| } |
| template <typename T> |
| TimeDelta& operator/=(T a) { |
| return *this = (*this / a); |
| } |
| |
| TimeDelta operator%(TimeDelta a) const { |
| return TimeDelta(delta_ % a.delta_); |
| } |
| |
| // Comparison operators. |
| constexpr bool operator==(TimeDelta other) const { |
| return delta_ == other.delta_; |
| } |
| constexpr bool operator!=(TimeDelta other) const { |
| return delta_ != other.delta_; |
| } |
| constexpr bool operator<(TimeDelta other) const { |
| return delta_ < other.delta_; |
| } |
| constexpr bool operator<=(TimeDelta other) const { |
| return delta_ <= other.delta_; |
| } |
| constexpr bool operator>(TimeDelta other) const { |
| return delta_ > other.delta_; |
| } |
| constexpr bool operator>=(TimeDelta other) const { |
| return delta_ >= other.delta_; |
| } |
| |
| private: |
| // Constructs a delta given the duration in nanoseconds. This is private |
| // to avoid confusion by callers with an integer constructor. Use |
| // FromSeconds, FromMilliseconds, etc. instead. |
| constexpr explicit TimeDelta(int64_t delta_ns) : delta_(delta_ns) {} |
| |
| // Delta in nanoseconds. |
| int64_t delta_; |
| }; |
| |
| template <typename T> |
| inline TimeDelta operator*(T a, TimeDelta td) { |
| return td * a; |
| } |
| |
| } // namespace rtc |
| |
| #endif // WEBRTC_BASE_TIMEDELTA_H_ |