On Thu, Jan 14, 2016 at 1:19 PM, Alfred Kwan <[email protected]> wrote:
> I would like to check (via reflection) whether a particular field within a
> oneof. This is the example message:
>
> message Foo {
> oneof Bar {
> int32 A = 1;
> string B = 2;
> }
> }
>
>
>
> I browse through the .h and it seems like the only plausible check is to
> examine it via Foo.GetReflection->HasOneof(), but I found it hardcoded as
> false in message.h:
>
> class LIBPROTOBUF_EXPORT Reflection {
> public:
> ...
> // Check if the oneof is set. Returns true if any field in oneof
> // is set, false otherwise.
> // TODO(jieluo) - make it pure virtual after updating all
> // the subclasses.
> virtual bool HasOneof(const Message& /*message*/,
> const OneofDescriptor* /*oneof_descriptor*/) const
> {
> return false;
> }
> ...
> }
>
> Am I missing something?
>
This is a virtual function. It's overridden by its subclasses.
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