Re: [Vala] instantiation via base class constructor

[devros <devros twotechos com>]

Hi

I hope this is what you had in mind.  I just joined so missed the
earlier postings.  Sorry I reformated you code (force of habit)

public class Aaa : Object {
    protected int x;
    public Aaa(int x) {
        this.x = x; 
    }
    
    public virtual void test() { 
        stdout.printf("%d\n", this.x); 
    }
}
        
public class Bbb : Aaa {

    public Bbb( int x){
        base(x);
    }
    
    public override void test() { 
        stdout.printf("%d\n", -this.x);            
    }
}
        
public class Driver : Object {
        
        public static void main(string [] args) {
               Bbb b = new Bbb(5);
               Aaa a = new Aaa(5);
               a.test();
               b.test();              
        }
}

It compiles and works.  If I missed something vala centric please let me
know.

Regards, Srecko

On Sun, 2008-12-28 at 18:33 +0100, Ciprian Mustiata wrote:
> Hi Andre, 
>
> You may use base keyword to call the super (derived base class)
> methods and constructor. I know that did not help, but you may reduce
> duplicating your code.
>
> Regards,
> Ciprian
>
> On Wed, Dec 24, 2008 at 2:29 PM, Andre Kuehne <andre kuehne gmx net>
> wrote:
>         Hello,
>         
>         i am new to Vala, played with it the last two days and have
>         now a bunch of open questions.
>         Here's one of them: Is it possible to instantiate a class via
>         a constructor of one of its base classes? For example the
>         following does not work:
>         
>         class Aaa {
>                public int x;
>                Aaa(int x) { this.x = x; }
>                public virtual void test() { stdout.printf("%d\n",
>         this.x); }
>         }
>         
>         class Bbb : Aaa {
>                public override void test() { stdout.printf("%d\n",
>         -this.x); }
>         }
>         
>         void main() {
>                new Bbb(5).test();
>         }
>         
>         $ valac super.vala
>         super.vala:13.2-13.11: error: Too many arguments, method
>         `Bbb.new' does not take 1 arguments
>                new Bbb(5).test();
>                ^^^^^^^^^^
>         Compilation failed: 1 error(s), 0 warning(s)
>         
>         Thanks in advance!
>         Andre
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