Add the macro CHAMPLAIN_MAP_SOURCE_DESC() for nicer casting

diff --git a/champlain/champlain-map-source-desc.h b/champlain/champlain-map-source-desc.h
index e7e9f40c7af5fd2e54ce4c73450657aa5978f422..358b67a6397beb0373c0f15e8abf991043e63d42 100644 (file)
--- a/champlain/champlain-map-source-desc.h
+++ b/champlain/champlain-map-source-desc.h
@@ -38,6 +38,8 @@ G_BEGIN_DECLS
 typedef ChamplainMapSource * (*ChamplainMapSourceConstructor) ();
 #define CHAMPLAIN_MAP_SOURCE_CONSTRUCTOR (f) ((ChamplainMapSourceConstructor) (f))
 
+#define CHAMPLAIN_MAP_SOURCE_DESC(obj)     ((ChamplainMapSourceDesc *) (obj))
+
 /**
  * ChamplainMapSourceDesc:
  *