Issue 6385 - Delete IfcGeom::Elements as soon as possible (#6411)

* ISSUE #6385 Delete iterator elements as soon as they are moved past

* ISSUE #6385 added loop to destructor to clean up initialised elements not yet disposed of by the iterator

src/ifcgeom/Iterator.h

@@ -663,6 +663,10 @@ namespace IfcGeom {
 		/// Use get() to retrieve the created geometry.
 		const IfcUtil::IfcBaseClass* next() {
 			using std::chrono::high_resolution_clock;
+
+			delete *task_result_iterator_;
+			delete *native_task_result_iterator_;
+
 			if (num_threads_ != 1) {
 				if (!wait_for_element()) {
 					Logger::SetProduct(boost::none);
@@ -886,18 +890,15 @@ namespace IfcGeom {
 				}
 			}
 			
-			if (settings_.get<ifcopenshell::geometry::settings::IteratorOutput>().get() != ifcopenshell::geometry::settings::NATIVE) {
-				for (auto& p : all_processed_native_elements_) {
-					delete p;
-				}
-			}
-			
 			for (auto& k : kernel_pool) {
 				delete k;
 			}
 
-			for (auto& p : all_processed_elements_) {
+			if (task_result_ptr_initialized) {
-				delete p;
+				while (task_result_iterator_ != --all_processed_elements_.end()) {
+					delete *task_result_iterator_++;
+					delete *native_task_result_iterator_++;
+				}
 			}
 
 			delete converter_;