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
}

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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/

10-16 09:26