Constexpr options access?

[Maxim Sigalov]

Hi all -

Is there anyway to access custom options added to fields at compile time?

As I understand it, and from looking at the generated code, it only seems possible to look up Options via an appropriate Descriptor, and I'm not sure it's possible to get a constexpr one?

I'm looking at an EnumValueOptions specifically, and adding a "name" option generates a "name_default" but no constexpr lookup it seems.

If this is not possible, is there any suggested workaround?

Thanks

[Jie Luo]

The custom options are in the EnumValueOptions' extension. Example:

https://github.com/protocolbuffers/protobuf/blob/5eafa23c98b93386319a3a9d6c1c2894174b5fb0/src/google/protobuf/descriptor_unittest.cc#L3192