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add a note to Vec's Extend<&T> impl about its slice specialization #43455

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bors merged 1 commit into from
Jul 26, 2017
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add a note to Vec's Extend<&T> impl about its slice specialization #43455

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6 changes: 6 additions & 0 deletions src/liballoc/vec.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1962,6 +1962,12 @@ impl<T> Vec<T> {

}

/// Extend implementation that copies elements out of references before pushing them onto the Vec.
///
/// This implementation is specialized for slice iterators, where it uses [`copy_from_slice`] to
/// append the entire slice at once.
///
/// [`copy_from_slice`]: ../../std/primitive.slice.html#method.copy_from_slice
#[stable(feature = "extend_ref", since = "1.2.0")]
impl<'a, T: 'a + Copy> Extend<&'a T> for Vec<T> {
fn extend<I: IntoIterator<Item = &'a T>>(&mut self, iter: I) {
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