X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Futil%2Findexed_map.rs;h=39565f048c07a25f30a6749b5057a55a15278664;hb=bedc2c64fcfe5fa5f85ded630e9ed2eb3c3651eb;hp=bb17d3450ee5ccb7193ebecd00583603071ba435;hpb=b0bf50fa2493e5364511eb781db9772a06e140f9;p=rust-lightning

diff --git a/lightning/src/util/indexed_map.rs b/lightning/src/util/indexed_map.rs
index bb17d345..39565f04 100644
--- a/lightning/src/util/indexed_map.rs
+++ b/lightning/src/util/indexed_map.rs
@@ -39,6 +39,14 @@ impl<K: Clone + Hash + Ord, V> IndexedMap<K, V> {
 		}
 	}
 
+	/// Constructs a new, empty map with the given capacity pre-allocated
+	pub fn with_capacity(capacity: usize) -> Self {
+		Self {
+			map: HashMap::with_capacity(capacity),
+			keys: Vec::with_capacity(capacity),
+		}
+	}
+
 	#[inline(always)]
 	/// Fetches the element with the given `key`, if one exists.
 	pub fn get(&self, key: &K) -> Option<&V> {