use Vec::with_capacity

Co-Authored-By: seunlanlege <seunlanlege@gmail.com>
openethereum · Jan 3, 2019 · dc6acf4 · dc6acf4
1 parent c8d9849
commit dc6acf4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ethcore/src/blockchain/blockchain.rs b/ethcore/src/blockchain/blockchain.rs
@@ -668,7 +668,7 @@ impl BlockChain {
 	/// fetches the list of blocks from best block to n, and n's parent hash
 	/// where n > 0
 	pub fn block_headers_from_best_block(&self, n: u64) -> Option<(Vec<encoded::Header>, H256)> {
-		let mut blocks = vec![];
+		let mut blocks = Vec::with_capacity(n);
 		let mut hash = self.best_block_hash();
 
 		for _ in 0..n {