CODEWITHSUNDEEP
c++c++11std
Adi Shavit
Adi Shavit

Reputation: 17265

Constructing chrono::time_point

Given two split values, seconds since epoch and µs, is one of the following preferable?

auto timestamp = system_clock::time_point(seconds(time_seconds) + microseconds(time_us));

or 

auto timestamp = system_clock::time_point(seconds(time_seconds)) + microseconds(time_us);

Upvotes: 1

Views: 104

Answers (1)

John Zwinck
John Zwinck

Reputation: 249103

It does not matter at all which one of those two you choose. It does however pay to have time_seconds and time_us as 64-bit integers--this cuts the whole operation from 5 instructions to 3 on x86_64. See: https://godbolt.org/g/8u1pYn

Upvotes: 1

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