Some fixes for clang

src/ifcgeom/IfcGeom.h

@@ -333,6 +333,14 @@ public:
 		return items;
 	}
 
+	virtual bool convert_placement(IfcUtil::IfcBaseClass* item, gp_Trsf& trsf) {
+		if (item->as<IfcSchema::IfcObjectPlacement>()) {
+			return convert(item->as<IfcSchema::IfcObjectPlacement>(), trsf);
+		} else {
+			return false;
+		}
+	}
+
 };
 
 IfcUtil::IfcBaseClass* MAKE_TYPE_NAME(tesselate_)(const TopoDS_Shape& shape, double deflection);

src/ifcgeom/IfcGeomIteratorImplementation.h

@@ -607,7 +607,7 @@ namespace IfcGeom {
 					ifc_product = ifc_entity->as<IfcSchema::IfcProduct>();
 					parent_id = -1;
 					try {
-						IfcSchema::IfcObjectDefinition* parent_object = kernel.get_decomposing_entity(ifc_product)->as<IfcSchema::IfcObjectDefinition>();
+						IfcSchema::IfcObjectDefinition* parent_object = kernel.get_decomposing_entity(ifc_product)->template as<IfcSchema::IfcObjectDefinition>();
 						if (parent_object) {
 							parent_id = parent_object->data().id();
 						}