Hi Jacek,
If you wanted to create a MesasgeReader that reads from a message created
by some MessageBuilder, you could use SegmentArrayMessageReader, like:
capnp::SegmentArrayMessageReader reader(builder.getSegmentsForOutput());
MyType::Reader root = reader.getRoot<MyType>();
This is a little bit of a funny thing to do. The performance will be almost
identical to if you had done:
MyType::Reader root = builder.getRoot<MyType>().asReader();
If you want to test packing/unpacking, then you will need to write the
packed data to a kj::OutputStream and then read it back from a
kj::InputStream. You could use kj::ArrayOutputStream and
kj::ArrayInputStream with a suitably-sized backing array to do this
in-memory.
-Kenton
On Thu, Feb 2, 2017 at 6:51 AM, <[email protected]> wrote:
> Hi
> I write simple app. And I want to test efficiency random access Capnpro
> structures. This is because you claim it is very fast. But I don't know how
> to create ::capnp::PackedMessageReader mMessageReader; with ::capnp::
> MallocMessageBuilder as input. Can you give me some advices how to do
> that?
>
> best regards
> Jacek
>
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