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Rollup merge of #105526 - Xiretza:iter-from-generator-derive, r=scottmcm

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libcore: make result of iter::from_generator Clone

`@rustbot` label +A-generators
This commit is contained in:
Matthias Krüger 2023-01-14 18:45:25 +01:00 committed by GitHub
commit 085d2f1f09
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1 changed files with 19 additions and 4 deletions
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23
library/core/src/iter/sources/from_generator.rs
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@ -1,3 +1,4 @@
use crate::fmt;
use crate::ops::{Generator, GeneratorState};
use crate::pin::Pin;
@ -23,14 +24,21 @@
/// ```
#[inline]
#[unstable(feature = "iter_from_generator", issue = "43122", reason = "generators are unstable")]
pub fn from_generator<G: Generator<Return = ()> + Unpin>(
generator: G,
) -> impl Iterator<Item = G::Yield> {
pub fn from_generator<G: Generator<Return = ()> + Unpin>(generator: G) -> FromGenerator<G> {
FromGenerator(generator)
}
struct FromGenerator<G>(G);
/// An iterator over the values yielded by an underlying generator.
///
/// This `struct` is created by the [`iter::from_generator()`] function. See its documentation for
/// more.
///
/// [`iter::from_generator()`]: from_generator
#[unstable(feature = "iter_from_generator", issue = "43122", reason = "generators are unstable")]
#[derive(Clone)]
pub struct FromGenerator<G>(G);
#[unstable(feature = "iter_from_generator", issue = "43122", reason = "generators are unstable")]
impl<G: Generator<Return = ()> + Unpin> Iterator for FromGenerator<G> {
type Item = G::Yield;
@ -41,3 +49,10 @@ fn next(&mut self) -> Option<Self::Item> {
}
}
}
#[unstable(feature = "iter_from_generator", issue = "43122", reason = "generators are unstable")]
impl<G> fmt::Debug for FromGenerator<G> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("FromGenerator").finish()
}
}