From c0459cf8967306eb1e3f1b9b5249ccfc210fbef1 Mon Sep 17 00:00:00 2001
From: BugLesser <17674638850@163.com>
Date: Thu, 29 Dec 2022 05:35:39 +0000
Subject: [PATCH] add Rename() support

---
 cache.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cache.go b/cache.go
index 4f7630f..4c33353 100644
--- a/cache.go
+++ b/cache.go
@@ -115,6 +115,8 @@ func (c *cache) Replace(k string, x interface{}, d time.Duration) error {
 	return nil
 }
 
+// Rename for the cache key only if it already exists, and the existing
+// item hasn't expired. Returns an error otherwise.
 func (c *cache) Rename(oldk, newk string) error {
 	c.mu.Lock()
 	defer c.mu.Unlock()