Merge pull request #2240 from Kixunil/patch-1

Call `reserve()` in `DeserializeSeed` example
serde-rs · Jun 30, 2022 · 6c098e4 · 6c098e4
2 parents 845b900 + 41ffa6d
commit 6c098e4
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/serde/src/de/mod.rs b/serde/src/de/mod.rs
@@ -708,6 +708,11 @@ impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}
 ///             where
 ///                 A: SeqAccess<'de>,
 ///             {
+///                 // Decrease the number of reallocations if there are many elements
+///                 if let Some(size_hint) = seq.size_hint() {
+///                    self.0.reserve(size_hint);
+///                 }
+///
 ///                 // Visit each element in the inner array and push it onto
 ///                 // the existing vector.
 ///                 while let Some(elem) = seq.next_element()? {