Re: [Vala] Safe call operator

[Jens Georg <mail jensge org>]

On Mo, 2012-02-20 at 07:28 +0100, pancake wrote:
> i really like the idea of having the elvis operator and the safe navigation operator in Vala.

Elvis is already supported, just with different syntax: ?? (same as in
C#)

> fmi : http://groovy.codehaus.org/Operators
>
> is this going to be added at some point into the compiler?
>
> On Feb 1, 2012, at 21:08, Jim Nelson <jim yorba org> wrote:
>
> > I was going to mention that as well.  Null handling in Java is not
> > analogous to Vala's strategy, if for no other reason than there's no NPE.
> >
> > It looks to me the idea of a future Vala that emphasizes code correctness
> > is that it will catch things like this:
> >
> > Xyxxy? x = get_xyzzy();
> > int result = x.foo();
> >
> > The compiler will flag that last line as problematic.  I think it will, at
> > least.  I don't really know.  But it seems to me that if null-checking is
> > going to be enforced by the compiler, it's not too much to ask the language
> > to supply good tools for doing that checking.  The nullable operator is one
> > step in that direction, but I've coded many lines where I needed something
> > like the Elvis operator (and the associated operators suggested by Project
> > Coin).
> >
> > I'll also point out that (according to the Project Coin page) the reason
> > the null-safety operators were turned down by the Java committee was that
> > the Checker framework was added to Java and that Groovy, the inspiration
> > for the proposed syntax, uses dynamic typing, which makes the operators
> > more flexible.  But the first is not going to happen for Vala (I've not
> > heard of any such framework) and the second could be made to argue against
> > the nullable operator, which was, in fact, added to Vala.
> >
> > I think the Elvis operator (and its cousins) should get real consideration
> > and not be dismissed merely because Java didn't take them.
> >
> > -- Jim
> >
> >
> >
> > On Tue, Jan 31, 2012 at 7:27 AM, Artem Tarasov <lomereiter googlemail com>wrote:
> >
> > > > As a starter, Java rejected that syntax.
> > >
> > > Yeah, but in Java at least a NullPointerException is thrown when null
> > > dereferencing occurs. In Vala the only option to provide null-safety
> > > is explicit checking for null after each method call in a chain.
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