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take mapped function by mutable reference

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This commit is contained in:
llogiq 2015-09-03 14:50:06 +02:00
parent b6a3978886
commit e1f89196a0
1 changed files with 4 additions and 4 deletions
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8
src/libcore/iter.rs
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@ -1683,7 +1683,7 @@ impl<B, I: Iterator, F> Iterator for Map<I, F> where F: FnMut(I::Item) -> B {
#[inline] #[inline]
fn next(&mut self) -> Option<B> { fn next(&mut self) -> Option<B> {
self.iter.next().map(self.f) self.iter.next().map(&mut self.f)
} }
#[inline] #[inline]
@ -1698,7 +1698,7 @@ impl<B, I: DoubleEndedIterator, F> DoubleEndedIterator for Map<I, F> where
{ {
#[inline] #[inline]
fn next_back(&mut self) -> Option<B> { fn next_back(&mut self) -> Option<B> {
self.iter.next_back().map(self.f) self.iter.next_back().map(&mut self.f)
} }
} }
@ -2210,7 +2210,7 @@ impl<I: Iterator, U: IntoIterator, F> Iterator for FlatMap<I, U, F>
return Some(x) return Some(x)
} }
} }
match self.iter.next().map(self.f) { match self.iter.next().map(&mut self.f) {
None => return self.backiter.as_mut().and_then(|it| it.next()), None => return self.backiter.as_mut().and_then(|it| it.next()),
next => self.frontiter = next.map(IntoIterator::into_iter), next => self.frontiter = next.map(IntoIterator::into_iter),
} }
@ -2243,7 +2243,7 @@ impl<I: DoubleEndedIterator, U, F> DoubleEndedIterator for FlatMap<I, U, F> wher
return Some(y) return Some(y)
} }
} }
match self.iter.next_back().map(self.f) { match self.iter.next_back().map(&mut self.f) {
None => return self.frontiter.as_mut().and_then(|it| it.next_back()), None => return self.frontiter.as_mut().and_then(|it| it.next_back()),
next => self.backiter = next.map(IntoIterator::into_iter), next => self.backiter = next.map(IntoIterator::into_iter),
} }