tree 7a09efbcae5d7ab4ca36ecfbcc76e419f4af5777
parent 00809c1d538ef0366c31319664d7b05f2bf97b75
author alshabalin <alshabalin@yandex-team.ru> 1464336091 +0900
committer Qijiang Fan <fqj@google.com> 1591294815 +0900

Make base::Optional trivially destructible when possible.

* Implement base::is_trivially_destructible.
* Add value_type to Optional.
* Make Optional<T> trivially destructible when T is trivially destructible.
* Add some more tests on Optional.

BUG=521269, 554293

Review-Url: https://codereview.chromium.org/2000043002
Cr-Commit-Position: refs/heads/master@{#396423}


CrOS-Libchrome-Original-Commit: f06b07dffd6ac5ee2f4e8bd2e1385c04a34f3da4