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use anyhow::Result;
use std::mem;
use crate::runtime::Block;
use crate::runtime::BlockMeta;
use crate::runtime::BlockMetaBuilder;
use crate::runtime::MessageIo;
use crate::runtime::MessageIoBuilder;
use crate::runtime::StreamIo;
use crate::runtime::StreamIoBuilder;
use crate::runtime::SyncKernel;
use crate::runtime::WorkIo;
pub struct Combine<A, B, C>
where
A: 'static,
B: 'static,
C: 'static,
{
f: Box<dyn FnMut(&A, &B) -> C + Send + 'static>,
}
impl<A, B, C> Combine<A, B, C>
where
A: 'static,
B: 'static,
C: 'static,
{
pub fn new(f: impl FnMut(&A, &B) -> C + Send + 'static) -> Block {
Block::new_sync(
BlockMetaBuilder::new("Combine").build(),
StreamIoBuilder::new()
.add_input("in0", mem::size_of::<A>())
.add_input("in1", mem::size_of::<B>())
.add_output("out", mem::size_of::<C>())
.build(),
MessageIoBuilder::<Combine<A, B, C>>::new().build(),
Combine { f: Box::new(f) },
)
}
}
#[async_trait]
impl<A, B, C> SyncKernel for Combine<A, B, C>
where
A: 'static,
B: 'static,
C: 'static,
{
fn work(
&mut self,
io: &mut WorkIo,
sio: &mut StreamIo,
_mio: &mut MessageIo<Self>,
_meta: &mut BlockMeta,
) -> Result<()> {
let i0 = sio.input(0).slice::<A>();
let i1 = sio.input(1).slice::<B>();
let o0 = sio.output(0).slice::<C>();
let m = std::cmp::min(i0.len(), i1.len());
let m = std::cmp::min(m, o0.len());
if m > 0 {
for ((x0, x1), y) in i0.iter().zip(i1.iter()).zip(o0.iter_mut()) {
*y = (self.f)(x0, x1);
}
sio.input(0).consume(m);
sio.input(1).consume(m);
sio.output(0).produce(m);
}
if sio.input(0).finished() && m == i0.len() {
io.finished = true;
}
if sio.input(1).finished() && m == i1.len() {
io.finished = true;
}
Ok(())
}
}