tree 2562b3f041eacb9da7a7a1d605bec3a2de370977
parent c98a674ab88e70c5d137330ccf8d82baaf7c3c92
author Lokbondo Kung <lokokung@google.com> 1750718699 -0700
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1750718699 -0700

[dawn][common] Adds nullptr constructor for ResultOrError<Ref<T>, E>.

- Without the explicit constructor, the resolution order selects
  the unique_ptr<Error> constructor over the templated constructor so
  returning nullptr will actually return a Result with neither an error
  nor a result which is never desirable.
- The additional constructor takes precendence for nullptr so instead
  returning nullptr results in returning a null Ref which is a valid
  result.

Change-Id: I4dfb8759e3c7fd7827f17755d2f7cce529968aa5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/247997
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>