Update (non-copy, non-move) assign operators.
Fix perfect-forwarded assign operator to look at condition to
decide whether it should participate in overload resolution.
Add Optional<U> copy- and move-like assign operators.
For that implementation, OptionalBase's copy-/move-assign
operators are slightly refactored.
BUG=784732
TEST=Ran trybot.
Change-Id: I69db9def857a1cce8e7b05f0c6e11922ee8d95db
Reviewed-on: https://chromium-review.googlesource.com/856539
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538699}
CrOS-Libchrome-Original-Commit: 40ee4aee34e39b711f266bbe3e03f4c033b9cf71
2 files changed