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

[Jiří Zárevúcky <zarevucky jiri gmail com>]

Sam Wilson píše v St 20. 01. 2010 v 17:42 -0500:
> > 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.  Is it possible to define a 
> nullable array of nullable strings? How?
>
> Sam
>                                         

Unless you use *experimental* features, you can't define *non-nullable*
array. Since you seem to be new to Vala, I strongly suggest not using
experimental features.

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