Method iter_mut

publication/code/chapter08/rbtree.rs:511–521

(&mut self)

    }

    fn iter_mut<'a>(&mut self) -> IterMut<'a, K, V> {
        let mut iterator = IterMut { stack: Vec::new() };
        let mut node = self.root;
        unsafe {
            while !node.is_null() {
                iterator.stack.push(&mut *node);
                node = (*node).left;
            }
        }
        iterator
    }
}

// 实现迭代功能