golang进行反射。Type[duplicate]

Question

This question already has an answer here:

• golang type assertion using reflect.Typeof() 5 answers

My Problem is as follows:

I have a slice of reflect.Value, that was returned from a MethodByName("foo").Call().

now i want to cast the contained values to their types, which i dont know statically, but in form of relflect.Type

Basically what i want to do is:

values[0].Interface().(mytype)

but with reflection

values[0].Interface().(reflect.TypeOf(responseObject))

This gives me the compilation error:

reflect.TypeOf(responseObject) is not a type

Is there a way to do this in go?

Thanks and regards

BillDoor

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Answer 1

What is a cast (type assertion)? It has two effects:

1. At compile time, the compile-time of the whole type assertion expression is the type casted to.
2. At runtime, a check is made on the actual runtime type of the value, and if it is not the type casted to, it will generate a runtime error.

Obviously, #1 doesn't make sense for a type that is not known at compile-time, because how can the compile-time type of something depend on something not known at compile time?

You can still do manually do #2 for a type that is not known at compile time. Just get the runtime type of the value using reflect.TypeOf() and compare it against the runtime.Type you have.