Check type in QgsLayerTreeLayer::toLayer and QgsLayerTreeLayer::toGroup

src/core/layertree/qgslayertree.h

@@ -56,36 +56,36 @@ class CORE_EXPORT QgsLayerTree : public QgsLayerTreeGroup
     }
 
     /**
-     * Cast node to a group. No type checking is done - use isGroup() to find out whether this operation is legal.
+     * Cast node to a group.
      *
      * \note Not available in Python bindings, because cast is automatic.
      * \since QGIS 2.4
      */
     static inline QgsLayerTreeGroup *toGroup( QgsLayerTreeNode *node ) SIP_SKIP
     {
-      return static_cast<QgsLayerTreeGroup *>( node );
+      return qobject_cast<QgsLayerTreeGroup *>( node );
     }
 
     /**
-     * Cast node to a layer. No type checking is done - use isLayer() to find out whether this operation is legal.
+     * Cast node to a layer.
      *
      * \note Not available in Python bindings, because cast is automatic.
      * \since QGIS 2.4
      */
     static inline QgsLayerTreeLayer *toLayer( QgsLayerTreeNode *node ) SIP_SKIP
     {
-      return static_cast<QgsLayerTreeLayer *>( node );
+      return qobject_cast<QgsLayerTreeLayer *>( node );
     }
 
     /**
-     * Cast node to a layer. No type checking is done - use isLayer() to find out whether this operation is legal.
+     * Cast node to a layer.
      *
      * \note Not available in Python bindings, because cast is automatic.
      * \since QGIS 2.4
      */
     static inline const QgsLayerTreeLayer *toLayer( const QgsLayerTreeNode *node ) SIP_SKIP
     {
-      return static_cast< const QgsLayerTreeLayer *>( node );
+      return qobject_cast< const QgsLayerTreeLayer *>( node );
     }
 
     /**