On Mon, Nov 10, 2014 at 3:30 PM, Виталий Кирсанов <[email protected]>
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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