The descriptor itself contains a list of all of the defined fields for the
type.  E.g.:
  const Descriptor* type = message->GetDescriptor();
  for (int i = 0; i < type->field_count(); i++) {
    const FieldDescriptor* field = type->field(i);
    // handle field
  }

On Tue, Apr 14, 2009 at 6:09 PM, Joe <ven...@gmail.com> wrote:

>
> I'm using the TextFormat provided by protocol buffers to read in and
> print out messages in ... text format.  I have a lot of optional
> fields with defaults in my .proto file.  When I do a
> TextFormat::Print, only set values are printed.  I'd like
> TextFormat::Print to also print unset values.  Am I crazy?
>
> I tried to figure out a way to do this using the reflection API, but
> it seems to only provide a way to list the set fields of a message.
> Is there any other way to do this?
> >
>

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