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Specialize Vec::extend to Vec::extend_from_slice

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This commit is contained in:
Florian Hartwig 2016-10-11 19:22:41 +02:00
parent e33562078f
commit 63ee8d0bbc
1 changed files with 18 additions and 1 deletions
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19
src/libcollections/vec.rs
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@ -1571,7 +1571,24 @@ impl<T> Vec<T> {
#[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) {
self.extend(iter.into_iter().cloned());
<I as SpecExtendVec<T>>::extend_vec(iter, self);
}
}
// helper trait for specialization of Vec's Extend impl
trait SpecExtendVec<T> {
fn extend_vec(self, vec: &mut Vec<T>);
}
impl <'a, T: 'a + Copy, I: IntoIterator<Item=&'a T>> SpecExtendVec<T> for I {
default fn extend_vec(self, vec: &mut Vec<T>) {
vec.extend(self.into_iter().cloned());
}
}
impl<'a, T: Copy> SpecExtendVec<T> for &'a [T] {
fn extend_vec(self, vec: &mut Vec<T>) {
vec.extend_from_slice(self);
}
}