TODO: 修改Iterator 添加一个滑动到边界的方法.

tree/avldup/avldup.go

@@ -46,14 +46,14 @@ func (tree *Tree) String() string {
 	return str
 }
 
-func (tree *Tree) Iterator() *Iterator {
-	return initIterator(tree)
-}
-
 func (tree *Tree) Size() int {
 	return tree.size
 }
 
+func (tree *Tree) Iterator() *Iterator {
+	return initIterator(tree)
+}
+
 func (tree *Tree) Remove(key interface{}) (interface{}, bool) {
 
 	if n, ok := tree.GetNode(key); ok {