Smarter CVec::collect() #14

citybound · Nov 21, 2016 · 0b14d95 · 0b14d95
1 parent 4ba8980
commit 0b14d95
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/lib/kay/src/compact_vec.rs b/lib/kay/src/compact_vec.rs
@@ -315,8 +315,9 @@ impl<T: Copy, A: Allocator> Clone for CompactVec<T, A> {
 
 impl<T: Compact + Clone, A: Allocator> FromIterator<T> for CompactVec<T, A> {
     fn from_iter<I: IntoIterator<Item=T>>(iter: I) -> Self {
-        let mut vec = CompactVec::new();
-        for item in iter {
+        let into_iter = iter.into_iter();
+        let mut vec = CompactVec::with_capacity(into_iter.size_hint().0);
+        for item in into_iter {
             vec.push(item);
         }
         vec