Cleanup concurrently created breps and triangulations

src/ifcgeom/IfcGeomIteratorImplementation.h

@@ -961,6 +961,16 @@ namespace IfcGeom {
 				delete ifc_file;
 			}
 
+			if (settings.get(IfcGeom::IteratorSettings::DISABLE_TRIANGULATION)) {
+				for (auto& p : all_processed_native_elements_) {
+					delete p;
+				}
+			}
+
+			for (auto& p : all_processed_elements_) {
+				delete p;
+			}
+
 			free_shapes();
 		}
 	};