From 2a2dbf19716a7f60a05ed2f171cbbdd068db5867 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Sat, 9 Dec 2023 10:24:45 +0800
Subject: [PATCH] Add compat func for `clear`

---
 common/clear.go        | 11 +++++++++++
 common/clear_compat.go | 16 ++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 common/clear.go
 create mode 100644 common/clear_compat.go

diff --git a/common/clear.go b/common/clear.go
new file mode 100644
index 0000000..9768e9c
--- /dev/null
+++ b/common/clear.go
@@ -0,0 +1,11 @@
+//go:build go1.21
+
+package common
+
+func ClearArray[T ~[]E, E any](t T) {
+	clear(t)
+}
+
+func ClearMap[T ~map[K]V, K comparable, V any](t T) {
+	clear(t)
+}
diff --git a/common/clear_compat.go b/common/clear_compat.go
new file mode 100644
index 0000000..4e7e9cd
--- /dev/null
+++ b/common/clear_compat.go
@@ -0,0 +1,16 @@
+//go:build !go1.21
+
+package common
+
+func ClearArray[T ~[]E, E any](t T) {
+	var defaultValue E
+	for i := range t {
+		t[i] = defaultValue
+	}
+}
+
+func ClearMap[T ~map[K]V, K comparable, V any](t T) {
+	for k := range t {
+		delete(t, k)
+	}
+}