some refining...
func Experimental(src, dst string) error {
//goto jumps to "label" if present; selects values right to left; is
ignored with value´s zero value
goto r, err := os.Open(src)
defer r.Close()
goto w, err := os.Create(dst)
defer w.Close()
goto v, err := io.Copy(w, r)
goto err := w.Close()
//new: a "label" is a block also holding pointer to the actual value
v: {
//do something with value here...
//return error
}
err:{
defer os.Remove(dst)
return fmt.Errorf("copy %s %s: %v", src, dst, err)
}
return nil
}
Ian Lance Taylor schrieb am Donnerstag, 14. April 2022 um 00:04:22 UTC+2:
> On Wed, Apr 13, 2022 at 2:44 PM Matthias Mädel
> <medienwer...@gmail.com> wrote:
> >
> > Please some advice if something like the following could be helpful and
> if it is possible to implement with the compiler.
> >
> > Thank You
> >
> > func Experimental(src, dst string) error {
> >
> > //goto is blocked with err == nil
> > goto r, err := os.Open(src)
> > defer r.Close()
> > goto w, err := os.Create(dst)
> > goto v, err := io.Copy(w, r)
> > goto err := w.Close()
> > return nil
> >
> > //alternative
> > goto err {
> > r, err := os.Open(src)
> > defer r.Close()
> > w, err := os.Create(dst)
> > v, err := io.Copy(w, r)
> > err := w.Close()
> > return nil
> > }
> >
> > return err:
> > w.Close()
> > os.Remove(dst)
> > fmt.Errorf("copy %s %s: %v", src, dst, err)
>
> Has some similarities to
>
> https://go.dev/issue/32611
> https://go.dev/issue/34140
> https://go.dev/issue/37035
>
> Ian
>
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