30 lines
590 B
Rust
30 lines
590 B
Rust
use crate::lib::future::Future;
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use crate::lib::marker::Unpin;
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use crate::lib::pin::Pin;
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use crate::lib::task::{Context, Poll};
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// Replace usage of this with std::future::poll_fn once it stabilizes
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pub struct PollFn<F> {
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f: F,
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}
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impl<F> Unpin for PollFn<F> {}
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pub fn poll_fn<T, F>(f: F) -> PollFn<F>
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where
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F: FnMut(&mut Context<'_>) -> Poll<T>,
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{
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PollFn { f }
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}
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impl<T, F> Future for PollFn<F>
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where
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F: FnMut(&mut Context<'_>) -> Poll<T>,
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{
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type Output = T;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
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(&mut self.f)(cx)
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}
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}
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