tree 7aed796e9ce8ac7c7ddf5140fa9427efb3400a59
parent 8fb9488890264bcb4f468604b84f2e301b2cd61f
author Chris Kennelly CA <ckennelly@google.com> 1792808848 -0700
committer Copybara-Service <copybara-worker@google.com> 1792808890 -0700

Skip initializing, locking, and cloning unmodified flags in FlagSaver.

GoogleTest constructs an absl::FlagSaver around every test, which previously
forced lazy initialization, mutex acquisition, and value cloning across every
registered flag in the binary even when almost none are modified.

Instead, record unmodified flags without initializing them, acquiring their
mutex, or cloning their values, and reconstruct their initial default value on restoration only if the flag was mutated while saved.

PiperOrigin-RevId: 1006034347