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Extend the book's async page to show multiple calls to rust::Fn producing a stream #861

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Extend the book's async page to show multiple calls to rust::Fn producing a stream #861

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Extend the book's async example to show multiple calls to rust::Fn to…
jerel May 3, 2021
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Improved grammar
jerel May 3, 2021
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22 changes: 22 additions & 0 deletions book/src/async.md
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Expand Up @@ -84,3 +84,25 @@ void shim_doThing(
});
}
```

### Streams

The async example above can be extended to support streaming data as well using a channel such as [`futures::channel::mpsc::unbounded`] instead of oneshot and passing `DoThingContext` to the closure as a reference:

[`futures::channel::mpsc::unbounded`]: https://docs.rs/futures/0.3.8/futures/channel/mpsc/fn.unbounded.html

```cpp
// bridge_shim.cc

#include "path/to/bridge.rs.h"
#include "rust/cxx.h"

void shim_doThing(
Arg arg,
rust::Fn<void(const DoThingContext &ctx, Ret ret)> done,
rust::Box<DoThingContext> ctx) noexcept {
done(*ctx, std::move(res));
done(*ctx, std::move(res));
done(*ctx, std::move(res));
}
```