add with_capacity helper to SnapshotVec

nikomatsakis · nikomatsakis · commit 558771fe9927 · 2017-10-31T04:49:59.000-04:00
diff --git a/src/snapshot_vec.rs b/src/snapshot_vec.rs
@@ -67,6 +67,13 @@ impl<D: SnapshotVecDelegate> SnapshotVec<D> {
         }
     }
 
+    pub fn with_capacity(c: usize) -> SnapshotVec<D> {
+        SnapshotVec {
+            values: Vec::with_capacity(c),
+            undo_log: Vec::new(),
+        }
+    }
+
     fn in_snapshot(&self) -> bool {
         !self.undo_log.is_empty()
     }

Original file line number	Diff line number	Diff line change
`@@ -67,6 +67,13 @@ impl<D: SnapshotVecDelegate> SnapshotVec<D> {`
`67`	`67`	`}`
`68`	`68`	`}`
`69`	`69`
	`70`	`+ pub fn with_capacity(c: usize) -> SnapshotVec<D> {`
	`71`	`+ SnapshotVec {`
	`72`	`+ values: Vec::with_capacity(c),`
	`73`	`+ undo_log: Vec::new(),`
	`74`	`+ }`
	`75`	`+ }`
	`76`	`+`
`70`	`77`	`fn in_snapshot(&self) -> bool {`
`71`	`78`	`!self.undo_log.is_empty()`
`72`	`79`	`}`