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use size hints

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This commit is contained in:
Clark Gaebel 2014-10-28 10:36:41 -07:00
parent 4d610e36bd
commit fe36399628
1 changed files with 14 additions and 0 deletions
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14
components/util/smallvec.rs
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@ -405,6 +405,12 @@ macro_rules! def_small_vector(
fn from_iter<I: Iterator<T>>(mut iter: I) -> $name<T> { fn from_iter<I: Iterator<T>>(mut iter: I) -> $name<T> {
let mut v = $name::new(); let mut v = $name::new();
let (lower_size_bound, _) = iter.size_hint();
if lower_size_bound > v.cap() {
v.grow(lower_size_bound);
}
for elem in iter { for elem in iter {
v.push(elem); v.push(elem);
} }
@ -415,6 +421,14 @@ macro_rules! def_small_vector(
impl<T: 'static> Extendable<T> for $name<T> { impl<T: 'static> Extendable<T> for $name<T> {
fn extend<I: Iterator<T>>(&mut self, mut iter: I) { fn extend<I: Iterator<T>>(&mut self, mut iter: I) {
let (lower_size_bound, _) = iter.size_hint();
let target_len = self.len() + lower_size_bound;
if target_len > self.cap() {
v.grow(target_len);
}
for elem in iter { for elem in iter {
self.push(elem); self.push(elem);
} }