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PutBack::put_back now returns the old value #880

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Merged
merged 1 commit into from
Feb 19, 2024
Merged

PutBack::put_back now returns the old value #880

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6 changes: 3 additions & 3 deletions src/adaptors/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -280,10 +280,10 @@ where

/// Put back a single value to the front of the iterator.
///
/// If a value is already in the put back slot, it is overwritten.
/// If a value is already in the put back slot, it is returned.
#[inline]
pub fn put_back(&mut self, x: I::Item) {
self.top = Some(x);
pub fn put_back(&mut self, x: I::Item) -> Option<I::Item> {
self.top.replace(x)
}
}

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2 changes: 1 addition & 1 deletion tests/quick.rs
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Expand Up @@ -882,7 +882,7 @@ quickcheck! {
fn size_put_back(a: Vec<u8>, x: Option<u8>) -> bool {
let mut it = put_back(a.into_iter());
if let Some(t) = x {
it.put_back(t)
it.put_back(t);
}
correct_size_hint(it)
}
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