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shuf: Use impl return type in trait now that MSRV is high enough

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This commit is contained in:
Jan Verbeek 2025-03-16 13:42:17 +01:00
parent cdd1052cea
commit e830dd45f0
1 changed files with 4 additions and 19 deletions
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23
src/uu/shuf/src/shuf.rs
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@ -243,17 +243,11 @@ trait Shufable {
type Item: Writable;
fn is_empty(&self) -> bool;
fn choose(&self, rng: &mut WrappedRng) -> Self::Item;
// This type shouldn't even be known. However, because we want to support
// Rust 1.70, it is not possible to return "impl Iterator".
// TODO: When the MSRV is raised, rewrite this to return "impl Iterator".
type PartialShuffleIterator<'b>: Iterator<Item = Self::Item>
where
Self: 'b;
fn partial_shuffle<'b>(
&'b mut self,
rng: &'b mut WrappedRng,
amount: usize,
) -> Self::PartialShuffleIterator<'b>;
) -> impl Iterator<Item = Self::Item>;
}
impl<'a> Shufable for Vec<&'a [u8]> {
@ -267,15 +261,11 @@ impl<'a> Shufable for Vec<&'a [u8]> {
// this is safe.
(**self).choose(rng).unwrap()
}
type PartialShuffleIterator<'b>
= std::iter::Copied<std::slice::Iter<'b, &'a [u8]>>
where
Self: 'b;
fn partial_shuffle<'b>(
&'b mut self,
rng: &'b mut WrappedRng,
amount: usize,
) -> Self::PartialShuffleIterator<'b> {
) -> impl Iterator<Item = Self::Item> {
// Note: "copied()" only copies the reference, not the entire [u8].
(**self).partial_shuffle(rng, amount).0.iter().copied()
}
@ -289,12 +279,11 @@ impl<'a> Shufable for Vec<&'a OsStr> {
fn choose(&self, rng: &mut WrappedRng) -> Self::Item {
(**self).choose(rng).unwrap()
}
type PartialShuffleIterator<'b> = std::iter::Copied<std::slice::Iter<'b, &'a OsStr>> where Self: 'b;
fn partial_shuffle<'b>(
&'b mut self,
rng: &'b mut WrappedRng,
amount: usize,
) -> Self::PartialShuffleIterator<'b> {
) -> impl Iterator<Item = Self::Item> {
(**self).partial_shuffle(rng, amount).0.iter().copied()
}
}
@ -307,15 +296,11 @@ impl Shufable for RangeInclusive<usize> {
fn choose(&self, rng: &mut WrappedRng) -> usize {
rng.random_range(self.clone())
}
type PartialShuffleIterator<'b>
= NonrepeatingIterator<'b>
where
Self: 'b;
fn partial_shuffle<'b>(
&'b mut self,
rng: &'b mut WrappedRng,
amount: usize,
) -> Self::PartialShuffleIterator<'b> {
) -> impl Iterator<Item = Self::Item> {
NonrepeatingIterator::new(self.clone(), rng, amount)
}
}