On Thu, Oct 13, 2016 at 2:42 PM <d...@veryhaha.com> wrote: > I don't understand the comment of the last line. Can someone explain it for me?
"r has type io.Reader" means that the type if expr.(T) is T. "and y must implement both I and io.Reader" y is either nil or it implements I, because that's how it was declared and nothing not implementing I can be assigned to it. The dynamic type of y can implement any number of interfaces, so it can implement both I and io.Reader. The later is checked at run time when the type assertion expression y.(io.Reader) is actually evaluated. -- -j -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
