On Mon, Feb 23, 2009 at 7:26 PM, Tim <timbla...@gmail.com> wrote:
> Hi Kenton. I was wondering if you had any update on implementing
> packed repeated fields using wire format 2. I'm evaluating GPB for use
> in an embedded device, and love it for its ability to generalize data
> storage/serialization/introspection. But having a tag for each
> repeated element is kind of a deal-breaker for us due to space
> requirements. Especially since we're planning to use 4 byte tags
> across the board in our system so that there's enough space for a
> unique tag for each attribute in our system.
> Curious, and Thanks,
> Tim
It's implemented in SVN, and will be in the next release (2.0.4), whenever
that may be. Just stick [packed=true] on to any repeated scalar field:
repeated int32 foo = 1 [packed=true];
>
>
> On Jul 8 2008, 10:13 am, "Kenton Varda" <ken...@google.com> wrote:
> > 2008/7/8 hepaminondas <hepaminon...@gmail.com>:
> >
> >
> >
> > > Hi,
> > > Pretty cool stuff!
> > > Could be really useful for data flow in scientific applications.
> > > Just wondering how I'd write a proto which would allow the encoding
> > > of, for example, a Numpy array?
> >
> > What's a Numpy array, exactly? Google search suggests it's a
> > multi-dimensional array?
> >
> > Unfortunately this would have to be pretty ad-hoc at the moment. You do
> > something like:
> >
> > message Row { repeated int32 element = 1; }
> > message Matrix { repeated Row row = 1; }
> >
> > Ugly, I know. Another problem with this is that a 1-byte tag will be
> > emitted for every element, meaning it's somewhat inefficient.
> >
> > Another option is to just pack all the data arbitrarily and store them in
> a
> > "bytes" field, but that sort of defeats the purpose of protocol buffers.
> >
> > I have plans to add a new "packed" encoding for repeated fields, which
> would
> > allow there to be a single tag for an entire repeated field, but it's not
> > there yet, and it still doesn't provide good multi-dimensional support.
>
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