Comments (3)
Hm, interesting question! Maybe the way to go would be to implement ReaderSegments
for message::Builder
, like this:
impl <A> ReaderSegments for Builder<A> where A: Allocator {
fn get_segment<'a>(&'a self, id: u32) -> Option<&'a [Word]> {
self.get_segments_for_output().get(id as usize).map(|x| *x)
}
}
Then you could create a message::Reader
that wraps a message::Builder
.
from capnproto-rust.
Sorry it's taken me so long to respond. That indeed works! The result is a bit strange (because you need to wrap the Builder
inside a Reader
to get at the ReaderSegments
) but here's an example:
#[test]
fn test_typed_builder() {
let mut builder = message::Builder::new_default();
{
let mut ts_root = builder.init_root::<timestamp::Builder>();
ts_root.set_seconds(14);
ts_root.set_subsecond_nanos(0);
}
let reader = message::Reader::new(builder, message::ReaderOptions::new());
let owned_message: TypedReader<message::Builder<message::HeapAllocator>, timestamp::Owned> = TypedReader::new(reader);
assert_eq!(owned_message.get().unwrap().get_seconds(), 14);
}
I'd like to encapsulate some of the above code into the Builder
- I don't see why I couldn't provide an "into_typed" (i.e. since I specifically want to consume the builder into the TypedReader
) - and I'll open a PR soon.
from capnproto-rust.
Closed by #84.
from capnproto-rust.
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from capnproto-rust.