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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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17
api/units/timestamp_unittest.cc
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@ -118,10 +118,27 @@ TEST(UnitConversionTest, TimestampAndTimeDeltaMath) {
const Timestamp time_a = Timestamp::ms(kValueA);
const Timestamp time_b = Timestamp::ms(kValueB);
const TimeDelta delta_a = TimeDelta::ms(kValueA);
const TimeDelta delta_b = TimeDelta::ms(kValueB);
EXPECT_EQ((time_a - time_b), TimeDelta::ms(kValueA - kValueB));
EXPECT_EQ((time_b - delta_a), Timestamp::ms(kValueB - kValueA));
EXPECT_EQ((time_b + delta_a), Timestamp::ms(kValueB + kValueA));
Timestamp mutable_time = time_a;
mutable_time += delta_b;
EXPECT_EQ(mutable_time, time_a + delta_b);
mutable_time -= delta_b;
EXPECT_EQ(mutable_time, time_a);
}
TEST(UnitConversionTest, InfinityOperations) {
const int64_t kValue = 267;
const Timestamp finite_time = Timestamp::ms(kValue);
const TimeDelta finite_delta = TimeDelta::ms(kValue);
EXPECT_TRUE((Timestamp::Infinity() + finite_delta).IsInfinite());
EXPECT_TRUE((Timestamp::Infinity() - finite_delta).IsInfinite());
EXPECT_TRUE((finite_time + TimeDelta::PlusInfinity()).IsInfinite());
EXPECT_TRUE((finite_time - TimeDelta::MinusInfinity()).IsInfinite());
}
} // namespace test
} // namespace webrtc