Il giorno giovedì 26 aprile 2018 18:55:07 UTC+2, Nimrod Shneor ha scritto:
>
> Hey everyone,
> I've encountered a design issue -
> I have an the following interface -
>
> type Runner interface {
> Run(x X,y Y)
> }
>
> I want to add to it an Init(...) method which will initialize the internal
> fields of the Runner before performing `Run`..
> My issue is that different structs implementing the `Runner` interface
> require different fields in order to initialize, How should I solve this?
>
>
You don't need an Init method. Just make sure that the instance
implementing the Runner interface is initialized before calling the Run
method.
As an example:
package runner
type Runner interface {
Run(x X, y Y)
}
type myrunner struct {
// ...
}
func (r *runner) Run(x X,y Y) {
// ...
}
func New(...) Runner {
r = new(runner)
// initialize the runner
return r
}
Note that the runner type is not exported, so that the user can not
accidentally call the Run method before the instance is initialized.
Also note that New returns Runner and not *myrunner.
Here is a working example:
https://play.golang.org/p/gqUiYkpq66D
Manlio
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