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Do not call reserve since extend will handle it.

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`Take` implements `TrustedLen` so we are guaranteed that only one
reserve call will be made.
This commit is contained in:
kjeremy 2020-03-30 17:09:21 -04:00
parent c39725212c
commit f633f69e36
1 changed files with 0 additions and 3 deletions
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3
crates/ra_arena/src/map.rs
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@ -14,9 +14,6 @@ pub struct ArenaMap<ID, V> {
impl<T, V> ArenaMap<Idx<T>, V> {
pub fn insert(&mut self, id: Idx<T>, t: V) {
let idx = Self::to_idx(id);
if self.v.capacity() <= idx {
self.v.reserve(idx + 1 - self.v.capacity());
}
let fill = (idx + 1).saturating_sub(self.v.len());
self.v.extend(std::iter::repeat_with(|| None).take(fill));