Optional.or() doesn't use a wildcard in its signature

[Vitaly Davidovich]

This would require Supplier<Optional<? extends T>>, not Supplier<? extends
Optional<T>>.

sent from my phone
On Oct 31, 2015 2:49 PM, "Michael Nascimento" <misterm at gmail.com> wrote:

> If this instance is an Optional<CharSequence> ,  passing an
> Optional<StringBuilder> will fail to compile.
>
> Regards,
> Michael
> On 31 Oct 2015 11:21, "Stefan Zobel" <spliterator at gmail.com> wrote:
>
> > 2015-10-31 19:11 GMT+01:00 Remi Forax <forax at univ-mlv.fr>:
> >
> > > Hi all, hi Paul,
> > >
> > > I've just seen that Optional.or is declared as
> > >   public Optional<T> or(Supplier<Optional<T>> supplier) {
> > > instead of
> > >   public Optional<T> or(Supplier<? extends Optional<T>> supplier) {
> > >
> > > regards,
> > > Rémi
> > >
> >
> >
> > I don't get it. Optional is final anyway. Can you explain?
> >
> > Thanks,
> > Stefan
> >
>