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CppCon 2018:H. Wright “Large-Scale Changes at Google: Lessons Learned From 5 Yrs of Mass Migrations”

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Further reading 1

What does a module promise its callers? →Try replacing a module whose callers rely on its incidental return order. Start with what the interface says, then trace the decisions it hides and the behaviors people have learned to expect.This video helps answer · Who migrates when a field becomes mandatory?

Caption notes

Wright breaks a repository-wide migration into reviewable steps. Introduce the replacement without changing the default, migrate callers, then retire the old path, keeping intermediate states usable.

Video or transcript source ↗
Original passages · 2
Usually you add the new thing without making it the default.
CppCon 2018:H. Wright “Large-Scale Changes at Google: Lessons Learned From 5 Yrs of Mass Migrations” · ▶ 13:15–13:19
Smaller diffs, easier to review, easier to understand.
CppCon 2018:H. Wright “Large-Scale Changes at Google: Lessons Learned From 5 Yrs of Mass Migrations” · ▶ 13:00–13:03

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