Re: [Vala] How to extend IOStream in Vala?

[Luca Bruno <lethalman88 gmail com>]

On Mon, Nov 21, 2011 at 11:50 AM, Paul Jakma <paul jakma org> wrote:

> Hi,
>
> I want to extend IOStream, to create a memory channel based IO stream, by
> wrapping around some modified Memory{In,Out}putStreams. However, it doesn't
> seem to be possible, because the input_stream and output_stream properties
> of IOStream are read-only. I get this warning if I try to set them from my
> extending class:
>
> MemoryIOStream.vala:44.5-44.**23: error: Property
> `GLib.IOStream.input_stream' is read-only
>
> If I try to define these fields in my extending class, i.e.:
>
>  public InputStream input_stream { public get; private set; }
>  public OutputStream output_stream { public get; private set; }
>
> I get a warning that I'm hiding the visibility of the inherited
> property[1]:

There's a bug in the bindings. Both input_stream and output_stream must be
abstract.
This should be the right way to extend IOStream:

public class Foo : IOStream {
        public override InputStream input_stream { get {
                return your_input_stream; } }
        public override OutputStream output_stream { get {
                return your_output_stream; } }
}

Feel free to report a bug at bugzilla.gnome.org .

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