mapix · May 6, 2018 11:33 · May 6, 2018
diff --git a/deco.go b/deco.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"runtime"
+)
+
+func Decorator(decoPtr, fn interface{}) (err error) {
+	var decoratedFunc, targetFunc reflect.Value
+
+	decoratedFunc = reflect.ValueOf(decoPtr).Elem()
+	targetFunc = reflect.ValueOf(fn)
+	var funcName = runtime.FuncForPC(reflect.ValueOf(fn).Pointer()).Name()
+	v := reflect.MakeFunc(targetFunc.Type(),
+		func(in []reflect.Value) (out []reflect.Value) {
+			// fmt.Println("before")
+			out = targetFunc.Call(in)
+			fmt.Println("funcName", funcName)
+			fmt.Println("args", in)
+			// fmt.Println("after")
+			return
+		})
+
+	decoratedFunc.Set(v)
+	return
+}
+
+func bar(a, b string) string {
+	return a + b
+}
+
+func main() {
+	mybar := bar
+	Decorator(&mybar, bar)
+	mybar("hello,", "world!")
+}