How to get the reflect.Type of an interface?

Question

In order to determine whether a given type implements an interface using the reflect package, you need to pass a reflect.Type to reflect.Type.Implements(). How do you get o

Answer 1

Even Shaws response is correct, but brief. Some more details from the reflect.TypeOf method documentation:

// As interface types are only used for static typing, a common idiom to find
// the reflection Type for an interface type Foo is to use a *Foo value.

writerType := reflect.TypeOf((*io.Writer)(nil)).Elem()

fileType := reflect.TypeOf((*os.File)(nil)).Elem()
fmt.Println(fileType.Implements(writerType))