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Merge pull request #771 from stensonowen/typos

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Fix minor typos in post 12
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Philipp Oppermann
2020-03-28 11:40:07 +01:00
committed by GitHub
parent 84f726edd6 e7a35086f7
commit a83a946cda
1 changed files with 3 additions and 3 deletions
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6
blog/content/second-edition/posts/12-async-await/index.md
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@@ -191,7 +191,7 @@ struct StringLen<F> {
inner_future: F, inner_future: F,
} }
impl<F> Future for StringLen<F> where Fut: Future<Output = String> { impl<F> Future for StringLen<F> where F: Future<Output = String> {
type Output = usize; type Output = usize;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> { fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
@@ -909,7 +909,7 @@ fn dummy_waker() -> Waker {
} }
``` ```
The `from_raw` function is unsafe because undefined behavior can occur if the programmer does not uphelp the documented requirements of `RawWaker`. Before we look at the implementation of the `dummy_raw_waker` function, we first try to understand how the `RawWaker` type works. The `from_raw` function is unsafe because undefined behavior can occur if the programmer does not uphold the documented requirements of `RawWaker`. Before we look at the implementation of the `dummy_raw_waker` function, we first try to understand how the `RawWaker` type works.
##### `RawWaker` ##### `RawWaker`
@@ -1376,7 +1376,7 @@ The code is very similar to the code we had in our [keyboard interrupt handler]
[`next`]: https://docs.rs/futures-util/0.3.4/futures_util/stream/trait.StreamExt.html#method.next [`next`]: https://docs.rs/futures-util/0.3.4/futures_util/stream/trait.StreamExt.html#method.next
[`StreamExt`]: https://docs.rs/futures-util/0.3.4/futures_util/stream/trait.StreamExt.html [`StreamExt`]: https://docs.rs/futures-util/0.3.4/futures_util/stream/trait.StreamExt.html
We use `while let` to loop until the stream returns `None` to signal its end. Since our `poll_next` method never returns `None`, this is effectively and endless loop, so the `print_keypresses` task never finishes. We use `while let` to loop until the stream returns `None` to signal its end. Since our `poll_next` method never returns `None`, this is effectively an endless loop, so the `print_keypresses` task never finishes.
Let's add the `print_keypresses` task to our executor in our `main.rs` to get working keyboard input again: Let's add the `print_keypresses` task to our executor in our `main.rs` to get working keyboard input again: