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Rollup merge of #70981 - ssomers:btreemap_into_into_iter, r=Mark-Simulacrum

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Rearrange BTreeMap::into_iter to match range_mut.

r? @Mark-Simulacrum
I wondered why you catered for the optional root differently in `into_iter` than in `range_mut`.
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Mazdak Farrokhzad 2020-04-10 18:15:24 +02:00 committed by GitHub
commit f699a55e4b
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1 changed files with 12 additions and 12 deletions
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24
src/liballoc/collections/btree/map.rs
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@ -1544,19 +1544,19 @@ impl<K, V> IntoIterator for BTreeMap<K, V> {
type IntoIter = IntoIter<K, V>;
fn into_iter(self) -> IntoIter<K, V> {
let me = ManuallyDrop::new(self);
if me.root.is_none() {
return IntoIter { front: None, back: None, length: 0 };
}
let mut me = ManuallyDrop::new(self);
if let Some(root) = me.root.as_mut() {
let root1 = unsafe { ptr::read(root).into_ref() };
let root2 = unsafe { ptr::read(root).into_ref() };
let len = me.length;
let root1 = unsafe { unwrap_unchecked(ptr::read(&me.root)).into_ref() };
let root2 = unsafe { unwrap_unchecked(ptr::read(&me.root)).into_ref() };
let len = me.length;
IntoIter {
front: Some(root1.first_leaf_edge()),
back: Some(root2.last_leaf_edge()),
length: len,
IntoIter {
front: Some(root1.first_leaf_edge()),
back: Some(root2.last_leaf_edge()),
length: len,
}
} else {
IntoIter { front: None, back: None, length: 0 }
}
}
}