tree 248327302479448c7fd581bd649015fbe4597b87
parent 88bc5a7d99ffb95ed967653f6b41ffeb4c684fc8
author Joe Tsai <joetsai@digital-static.net> 1541453343 +0000
committer Joe Tsai <joetsai@digital-static.net> 1541537745 +0000

reflect/prototype: implement NewGoExtension

Implement the constructor for protoreflect.ExtensionType.
The constructor is more complicated than NewGoEnum and NewGoMessage because
it is responsible for providing the wrappers to present *[]T as a
protoreflect.Vector.

There are no tests since we need the follow-up logic in internal/impl to actually
make use of extensions. A subsequent CL will add that logic and comprehensively
test extensions.

Change-Id: I2d7893de299fe40be2ccedd8f39a92c40c41e59a
Reviewed-on: https://go-review.googlesource.com/c/147578
Reviewed-by: Herbie Ong <herbie@google.com>