On Wed, Nov 23, 2016 at 8:16 AM, Tong Sun <suntong...@gmail.com> wrote:
> Hi,
>
> How to architect the OO's virtual function in Go?
>
> Please take a look at this (not working) Go program
> https://play.golang.org/p/qrBX6ScABp
>
> Please think of the "func Output()" as a very complicated function that I
> only want to define once at the base level, not to duplicate into each sub
> classes.
>
> How can I make it works so that the last output statement, instead of being,
>
> fmt.Printf("[%v] %s: [%0.2f]\n", k, v.Name(), v.Area())
>
>
> will be this instead:
>
> fmt.Printf("[%v] %s\n", k, v.Output())
>
You define a function:
func Output(s Shape) string {
return s.Name() + "'s area size is " + s.Area()
}
Go uses interfaces for polymorphism.
Other OOP languages can use inheritance for polymorphism too, but Go
doesn't have inheritance.
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