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Adds infinite addition and subtraction to time units.

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This prepares for allowing use making arithmetic operators constexpr.

This also makes it easier to use for comparisons with offsets.
Now a > b + 10 ms works even if b is infinite.

Bug: webrtc:9574
Change-Id: Ie36092b72c2ec0f0c541641199a39155f5a796f3
Reviewed-on: https://webrtc-review.googlesource.com/96820
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24530}
This commit is contained in:
Sebastian Jansson
2018-08-30 13:58:38 +02:00
committed by Commit Bot
parent 16e27a1dc5
commit 88c1a9ecbc
4 changed files with 65 additions and 4 deletions
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10
api/units/timestamp.h
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@ -162,17 +162,23 @@ class Timestamp {
return TimeDelta::us(us() - other.us());
}
Timestamp operator-(const TimeDelta& delta) const {
RTC_DCHECK(!delta.IsPlusInfinity());
if (IsInfinite() || delta.IsMinusInfinity())
return Infinity();
return Timestamp::us(us() - delta.us());
}
Timestamp operator+(const TimeDelta& delta) const {
RTC_DCHECK(!delta.IsMinusInfinity());
if (IsInfinite() || delta.IsPlusInfinity())
return Infinity();
return Timestamp::us(us() + delta.us());
}
Timestamp& operator-=(const TimeDelta& other) {
microseconds_ -= other.us();
*this = *this - other;
return *this;
}
Timestamp& operator+=(const TimeDelta& other) {
microseconds_ += other.us();
*this = *this + other;
return *this;
}
constexpr bool operator==(const Timestamp& other) const {