如何返回一个err = nil作为reflect.Value?我需要编写一个交换函数以与reflect.MakeFunc()一起使用。
//my swap implementation, that call the original function and cache results
func swapFunc(ins []reflect.Value) []reflect.Value {
//After cache the first return (Offer) of function FindBestOffer(int)(Offer,bool,error),
//i need to return the best Offer cached and default values
//for the two other returns (bool=true, err=nil)
outs := make([]reflect.Value, 3) //mock cache return
outs[0] = reflect.ValueOf(Offer{10, "cached offer", 20})
outs[1] = reflect.ValueOf(true)
outs[2] = reflect.ValueOf(nil).Elem() // --> Doesn't work!
return outs
}
Go Playground full example
最佳答案
这很棘手,您必须使用 reflect.Zero
:
out[2] = reflect.Zero(reflect.TypeOf((*error)(nil)).Elem())
关于reflection - 去反射一下。如何返回一个err = nil作为reflect.Value?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/30652392/