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

[foracc <foracc d00m info>]

I just checked it out with C# and it shows exactly the same behaviour. I 
expected it to do

x = 3;
y = x;

rather than

x = 3;
y = 3;

Very interesting and good to know.



> 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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