tree d033744b2adc419c205db79d59949395ce06eaa9
parent fa0525bb40e5fb40958fe158b630e034ef7049f1
author Jeff Bailey <jeffbailey@google.com> 1659667442 +0000
committer Copybara-Service <copybara-worker@google.com> 1659668193 -0700

[libc] Trivial implementation of std::optional

This class has only the minimum functionality in it to provide what the
TZ variable parsing needs.  In particular, the standard makes guarantees
about how trivial the destructors are, throws an expception if it's used
incorrectly, etc.  There are also missing features.

Tested:
Trivial testsuite added, and use in development.

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D129920

GitOrigin-RevId: 3b631e47fe4cfc366fd107c748e6ac01b4f5974a