Re: [Vala] Setting and getting properties at the same time

[Edwin Dlca <edwinspire gmail com>]

int x, y = 9;

2012/11/1 Jarosław Ciupiński <kotowate gmail com>

> I think that it is pretty consistent and expected behaviour not only in
> Vala but in other languages as well (as long as they allow such things). I
> would be worried if it would work other way around. Example:
>
> int x, y;
> x = 2;
> y = x = 3;
>
> I expect that both y and x will have same value, 3. I would not like to get
> y=2 and x=3.
>
> I hope that this clears things up but I also wonder in which language it
> works differently.
>
> JC
>
> 2012/11/1 foracc <foracc d00m info>
>
> > Hello list,
> >
> > I stumbled on some (for me) unexpected behaviour when setting and getting
> > a property at the same time, which is not consistend with simple types
> like
> > int.
> >
> > When doing something like
> >
> > int x = (myclass.myproperty = y);
> >
> > x will be set to y, and not whatever mycalss.myproperty will be (or what
> > was mycalss.myproperty set to before). Is this a limitation of Vala?
> >
> > The code below shows this behaviour and should be pretty
> self-explanatory.
> > ---------- snip ----------
> >
> > public class myclass : Object
> > {
> >    private int _number;
> >
> >    public int number {
> >       set { _number = value * 2; }
> >       get { return _number; }
> >    }
> > }
> >
> > public void main(string[] args)
> > {
> >    myclass m = new myclass();
> >    int i = 2;
> >
> >    m.number = 2;
> >
> >    // prints 4, ok
> >    stdout.printf("number: %d\n", m.number);
> >
> >    // prints 3, not 6 (or at least 4)
> >    stdout.printf("number: %d\n", m.number = 3);
> >
> >    // prints 6, ok
> >    stdout.printf("number: %d\n", m.number);
> >
> >    / prints 5, ok
> >    stdout.printf("i: %d\n", i = 5);
> > }
> >
> > ---------- snip ----------
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