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Rollup merge of #54761 - Lucretiel:patch-1, r=cramertj

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Make spec_extend use for_each()

`for_each` will use an iterator's own implementation of `try_fold`, which I understand to be generally preferable (because nested iterator adapter's will use each other's `try_fold` and be designed for the specific adaptation in a way that promotes performance and inlining.
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Pietro Albini 2018-10-04 12:20:08 +02:00 • committed by GitHub
commit c215c1927a
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1 changed files with 2 additions and 2 deletions
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4
src/liballoc/vec.rs
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@ -1822,12 +1822,12 @@ impl<T, I> SpecExtend<T, I> for Vec<T>
unsafe {
let mut ptr = self.as_mut_ptr().add(self.len());
let mut local_len = SetLenOnDrop::new(&mut self.len);
for element in iterator {
iterator.for_each(move |element| {
ptr::write(ptr, element);
ptr = ptr.offset(1);
// NB can't overflow since we would have had to alloc the address space
local_len.increment_len(1);
}
});
}
} else {
self.extend_desugared(iterator)