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Decorators in Go
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| package main | |
| import ( | |
| "fmt" | |
| "reflect" | |
| ) | |
| func Decorate(impl interface{}) interface{} { | |
| fn := reflect.ValueOf(impl) | |
| inner := func(in []reflect.Value) []reflect.Value { | |
| f := reflect.ValueOf(impl) | |
| fmt.Println("Stuff before") | |
| // ... | |
| ret := f.Call(in) | |
| fmt.Println("Stuff after") | |
| // ... | |
| return ret | |
| } | |
| v := reflect.MakeFunc(fn.Type(), inner) | |
| return v.Interface() | |
| } | |
| var Add = Decorate( | |
| func (a, b int) int { | |
| return a + b | |
| }, | |
| ).(func(a, b int) int) | |
| func main() { | |
| fmt.Println(Add(1, 2)) | |
| } |
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