Re: [Vala] not null 'this' in constructors

[Edwin Pujols <edwinpm5 gmail com>]

On Mon, Nov 10, 2014 at 3:30 PM, Виталий Кирсанов <krokoziabla gmail com>
wrote:
> Hello list.
>
> Is 'this' always null in constructors? The following code produces a
> run-time error:
>
> public class Foo
> {
>     Foo()
>     {
>         assert( this != null );
>     }
> }


What error are you getting? "this" is /not/ null inside constructors...
That would
be weird :)

As is, this code does not compile because there's no "static main method"
(which is OK).

If I add a trivial main function (outsize the class) in which I instantiate
Foo,
I get that the constructor is not public; so access is restricted (which is
also OK).

None of this errors is saying that "this" is null. For example, this works:

public class Foo
{
    Foo()
    {
        assert(this != null);
    }





*    static int main()    {        var f = new Foo();        return 0;    }*
}

(Also a version with the main method outside the class but the constructor
made public should work).

> Is there a way to get the true value of this in the constructor? I guess,
> probably not. As far as I understand references in vala are somewhat
> similar to shared_ptr<> pointers in C++ and vala classes to
> enable_shared_from_this<> C++ subclasses. If the reasons are also similar,
> it would be sad.
>
> But probably vala gives a solution to this?
>
>
> BR, Vitaly Kirsanov
> skype: vkirsan
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