tree c2ed2068932c1614760b57bcc528411435d3c5a3
parent 50f860a45aab349ba28cd807e6864cd6c5cae444
author Damien Neil <dneil@google.com> 1567112908 -0700
committer Damien Neil <dneil@google.com> 1567544296 +0000

reflect/protoreflect: add ExtensionType IsValid{Interface,Value} methods

Add a way to typecheck a Value or interface{} without converting it to
the other form.  This permits implementations which store field values as
a Value (such as dynamicpb, or (soon) extensions in generated messages)
to validate inputs without an unnecessary conversion.

Fixes golang/protobuf#905

Change-Id: I1b78612b22ae832efbb55f81ae420871729e3a02
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/192457
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>