hi fabian,
thanks for you immediate reply. i already had a look at the c-code but i
must admit i dont fully understand it. however, as i said, if i change
the previous sample code this way (NEW LINE) ....
public class MyObject:Object{}
void main () {
Type typeFromClassLiteral = typeof(MyObject); // NEW LINE !!!
Type typeFromName = Type.from_name("MyObject");
print("%s\n", typeFromName.to_string());
print("%s\n", typeFromName.name());
}
i get something like this ....
161307536
MyObject
... so everything seems to be fine although no instance of MyObject was
created. anyway, you are right: when i look at the c-code now, the new
line above becomes ...
typeFromClassLiteral = TYPE_MY_OBJECT;
... and although i dont know much about c, it seems to me that
TYPE_MY_OBJECT is defined as ...
my_object_get_type ()
... which is again a function that registers the type internally.
however, is there any chance to do this type registration manually from
vala code?
ok, i guess, not. anyway. thank you!
peter
Am Mittwoch, den 29.09.2010, 19:07 +0200 schrieb Fabian Deutsch:
> hello.
>
> > however, if i run the following sample code ...
> >
> > public class MyObject:Object{}
> >
> > void main () {
> > Type typeFromName = Type.from_name("MyObject");
> > print("%s\n", typeFromName.to_string());
> > print("%s\n", typeFromName.name());
> > }
> >
> > ... i get the following output:
> >
> > 0
> > (null)
> >
> > ... which i obviously cannot use to create any object.
> >
> > i discovered that the code above works, but only if an object of
> > MyObject was previously created or if i previously used typeof(MyObject)
> > and assigned that type-object to some variable.
>
> This is, because types are registered only on the first use and not before.
> If you compile that code and look at the generated c-code, you see that the
> type is registered only when creating an instance.
>
> - fabian
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