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Remove unzip() SizeHint hack #34155

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Merged
merged 1 commit into from
Jun 21, 2016
Merged

Remove unzip() SizeHint hack #34155

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15 changes: 0 additions & 15 deletions src/libcore/iter/iterator.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@
use clone::Clone;
use cmp::{Ord, PartialOrd, PartialEq, Ordering};
use default::Default;
use marker;
use num::{Zero, One};
use ops::{Add, FnMut, Mul};
use option::Option::{self, Some, None};
Expand Down Expand Up @@ -1747,23 +1746,9 @@ pub trait Iterator {
FromB: Default + Extend<B>,
Self: Sized + Iterator<Item=(A, B)>,
{
struct SizeHint<A>(usize, Option<usize>, marker::PhantomData<A>);
impl<A> Iterator for SizeHint<A> {
type Item = A;

fn next(&mut self) -> Option<A> { None }
fn size_hint(&self) -> (usize, Option<usize>) {
(self.0, self.1)
}
}

let (lo, hi) = self.size_hint();
let mut ts: FromA = Default::default();
let mut us: FromB = Default::default();

ts.extend(SizeHint(lo, hi, marker::PhantomData));
us.extend(SizeHint(lo, hi, marker::PhantomData));

for (t, u) in self {
ts.extend(Some(t));
us.extend(Some(u));
Expand Down