[gupnp-av] Feature: Turns out it's useful to derive from that

[Jens Georg <jensgeorg src gnome org>]

commit f297aca19c08e3f1de9ddc2a413686b85ccf2a85
Author: Jens Georg <mail jensge org>
Date:   Thu Jul 8 22:18:28 2021 +0200

    Feature: Turns out it's useful to derive from that
    
    Not all features are just providing objectIDs. CLOCKSYNC or FFQ for
    example are more complex

 libgupnp-av/gupnp-feature.c |  8 --------
 libgupnp-av/gupnp-feature.h | 11 +++++++++--
 2 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/libgupnp-av/gupnp-feature.c b/libgupnp-av/gupnp-feature.c
index f904ce5..ee12015 100644
--- a/libgupnp-av/gupnp-feature.c
+++ b/libgupnp-av/gupnp-feature.c
@@ -18,10 +18,6 @@
 
 #include "gupnp-feature.h"
 
-struct _GUPnPFeatureClass {
-        GObjectClass parent_class;
-};
-
 struct _GUPnPFeaturePrivate {
         char *name;
         char *version;
@@ -29,10 +25,6 @@ struct _GUPnPFeaturePrivate {
 };
 typedef struct _GUPnPFeaturePrivate GUPnPFeaturePrivate;
 
-struct _GUPnPFeature {
-        GObject parent;
-};
-
 G_DEFINE_TYPE_WITH_PRIVATE (GUPnPFeature,
                             gupnp_feature,
                             G_TYPE_OBJECT)
diff --git a/libgupnp-av/gupnp-feature.h b/libgupnp-av/gupnp-feature.h
index 3126384..ffd486d 100644
--- a/libgupnp-av/gupnp-feature.h
+++ b/libgupnp-av/gupnp-feature.h
@@ -14,11 +14,18 @@
 
 G_BEGIN_DECLS
 
-typedef struct _GUPnPFeature GUPnPFeature;
-G_DECLARE_FINAL_TYPE (GUPnPFeature, gupnp_feature, GUPNP, FEATURE, GObject)
+G_DECLARE_DERIVABLE_TYPE(GUPnPFeature,
+                          gupnp_feature,
+                          GUPNP,
+                          FEATURE,
+                          GObject)
 
 #define GUPNP_TYPE_FEATURE (gupnp_feature_get_type ())
 
+struct _GUPnPFeatureClass {
+        GObjectClass parent_class;
+};
+
 const char *
 gupnp_feature_get_name       (GUPnPFeature *feature);