Re: [Vala] Proper Syntax for Array of Nullable Strings

["Andrés G. Aragoneses" <knocte gmail com>]

El 20/01/10 23:42, Sam Wilson escribió:
> > Date: Wed, 20 Jan 2010 23:23:11 +0100
> > From: scumm_fredo gmx net
> > To: vala-list gnome org
> > Subject: Re: [Vala] Proper Syntax for Array of Nullable Strings
> >
> > Jiří Zárevúcky wrote:
> > > tecywiz121 píše v St 20. 01. 2010 v 16:49 -0500:
> > > > I am just wondering if it is possible to have an array of nullable
> > > > strings, and if so, what is the proper syntax?
> > > >
> > > > Sam
> > >
> > > I believe array of class type can always contain nulls. Or am I
> > > mistaken? 
> >
> > Only without --enable-experimental-non-null.
> >
> > However, this one fails with --enable-experimental-non-null:
> >
> > ----------------------------------------------------------------------
> > void main () {
> >      string?[] a = new string?[10];
> > }
> > ----------------------------------------------------------------------
> > demo.vala:2.26-2.26: error: syntax error, expected ( or [
> >      string?[] a = new string?[10];
> >                              ^
> > Compilation failed: 1 error(s), 0 warning(s)
> > ----------------------------------------------------------------------
> >
> >
> > And this one as well:
> >
> > ----------------------------------------------------------------------
> > void main () {
> >      string?[] a = new string[10];
> > }
> > ----------------------------------------------------------------------
> > demo.vala:2.12-2.29: error: Assignment: Cannot convert from `string[]'
> > to `string?[]'
> >      string?[] a = new string[10];
> >                ^^^^^^^^^^^^^^^^^^
> > Compilation failed: 1 error(s), 0 warning(s)
> > ----------------------------------------------------------------------
> >
> > I think the first case should succeed. The latter case seems to fail
> > rightly.
> >
> >
> > Best regards,
> >
> > Frederik
>
>
> >
>
> Does this qualify as a bug?  Because as it stands now, I cannot define an array of nullable strings (or 
> floats or anything else for that matter)
>
> another problem I am having a hard time wrapping my head around is whether or not
>
>
>
> string?[] a = new string?[10];
>
>
>
> would define an nullable array of strings, or an array of nullable strings. 

I agree with Frederik here.


>  Is it possible to define a nullable array of nullable strings? How?

However, I don't agree with Frederik here, because I think you cannot
and vala shouldn't let you in the future (in case someone thinks it's a
limitation) because, as far as I know, in C# for example an array can
already be null, so making it nullable is non-sense.

        Andrés

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