> Adding methods to a primitive type, or more generally adding methods
> to a type defined in a different package, would cause different
> packages to behave differently depending on whether they see the
> methods. That would be confusing. It would meant that type
> assertions would sometimes succeed and sometimes fail, depending on
> the exact sequence of function calls used.
>
> Ian
>
Understood, granted due to Go structural typing it's easy to confuse where
the methods are coming from.
but given the following, for example,
// this allow new methods to be bounded to `String`
type String string
func Display(s string) {
fmt.Prinln(s)
}
func main() {
s := String("hello")
// this wont work, even though there is enough information that
`string` is the underlying type of `String`
// but if we use `type String = string`, this will work, but no
additional method binding is allowed.
Display(s)
// for `type String string`, we have to downcast it manually, but
we can bind new methods
Display(string(s)) // this works
}
Is it not possible to have both _auto_ downcasting and new method binding
to work in Go?
--
regards,
Nurahmadie
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