From 0b46ed11d19c53edf2611ab15e8888bbdc06c3a8 Mon Sep 17 00:00:00 2001
From: qydysky <qydysky@foxmail.com>
Date: Tue, 7 Nov 2023 23:58:21 +0800
Subject: [PATCH] 1

---
 ctx/Ctx.go      | 24 ++++++++++++++++++++++++
 ctx/Ctx_test.go | 10 ++++++++++
 2 files changed, 34 insertions(+)

diff --git a/ctx/Ctx.go b/ctx/Ctx.go
index c88caa5..dc84069 100644
--- a/ctx/Ctx.go
+++ b/ctx/Ctx.go
@@ -100,3 +100,27 @@ func Done(ctx context.Context) bool {
 	}
 	return false
 }
+
+type Value[T any] struct {
+	data T
+}
+
+func (t *Value[T]) get() T {
+	return t.data
+}
+
+func (t *Value[T]) set(data T) {
+	t.data = data
+}
+
+func (t *Value[T]) linkCtx(ctx context.Context) context.Context {
+	return context.WithValue(ctx, t, t)
+}
+
+func putVal[T any](ctx context.Context, key *Value[T], v T) {
+	if pt, ok := ctx.Value(key).(*Value[T]); ok {
+		pt.set(v)
+	} else {
+		panic("")
+	}
+}
diff --git a/ctx/Ctx_test.go b/ctx/Ctx_test.go
index 2d255aa..8b9706a 100644
--- a/ctx/Ctx_test.go
+++ b/ctx/Ctx_test.go
@@ -56,3 +56,13 @@ func TestMain2(t *testing.T) {
 		t.Fatal()
 	}
 }
+
+func TestMain3(t *testing.T) {
+	ctx := context.Background()
+	val := Value[error]{}
+	ctx = val.linkCtx(ctx)
+	putVal(ctx, &val, errors.New("aaa"))
+	if val.get().Error() != "aaa" {
+		t.Fatal()
+	}
+}
-- 
2.39.2