From 703d4ff8bf723674f1bee3a2fa75aa8b5ed60520 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Tue, 12 Nov 2024 14:51:18 +0800
Subject: [PATCH] Add common.ReverseMap

---
 common/cond.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/common/cond.go b/common/cond.go
index 9a447543..78e23650 100644
--- a/common/cond.go
+++ b/common/cond.go
@@ -268,6 +268,14 @@ func Reverse[T any](arr []T) []T {
 	return arr
 }
 
+func ReverseMap[K comparable, V comparable](m map[K]V) map[V]K {
+	ret := make(map[V]K, len(m))
+	for k, v := range m {
+		ret[v] = k
+	}
+	return ret
+}
+
 func Done(ctx context.Context) bool {
 	select {
 	case <-ctx.Done():