Rename count to len

src/rocksdb.rs

@@ -760,12 +760,12 @@ impl Writable for DB {
 }
 
 impl WriteBatch {
-    pub fn count(&self) -> usize {
+    pub fn len(&self) -> usize {
         unsafe { rocksdb_ffi::rocksdb_writebatch_count(self.inner) as usize }
     }
 
     pub fn is_empty(&self) -> bool {
-        self.count() == 0
+        self.len() == 0
     }
 }
 
@@ -982,10 +982,10 @@ fn writebatch_works() {
             // test put
             let batch = WriteBatch::default();
             assert!(db.get(b"k1").unwrap().is_none());
-            assert_eq!(batch.count(), 0);
+            assert_eq!(batch.len(), 0);
             assert!(batch.is_empty());
             let _ = batch.put(b"k1", b"v1111");
-            assert_eq!(batch.count(), 1);
+            assert_eq!(batch.len(), 1);
             assert!(!batch.is_empty());
             assert!(db.get(b"k1").unwrap().is_none());
             let p = db.write(batch);
@@ -997,7 +997,7 @@ fn writebatch_works() {
             // test delete
             let batch = WriteBatch::default();
             let _ = batch.delete(b"k1");
-            assert_eq!(batch.count(), 1);
+            assert_eq!(batch.len(), 1);
             assert!(!batch.is_empty());
             let p = db.write(batch);
             assert!(p.is_ok());