correct find elements recursion + test

tests/21-find-elements.cpp

@@ -0,0 +1,48 @@
+/* -----------------------------------------------------------------------------
+ * The Cyberiada GraphML C++ library implemention
+ *
+ * The test
+ *
+ * Copyright (C) 2024 Alexey Fedoseev <aleksey@fedoseev.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/
+ * ----------------------------------------------------------------------------- */
+
+#include <iostream>
+#include "cyberiadamlpp.h"
+
+using namespace Cyberiada;
+using namespace std;
+
+int main(int argc, char** argv)
+{
+	Document d;
+	try {
+		d.load(string(argv[0]) + "-input.graphml", formatLegacyYED);
+		const StateMachine* sm = d.get_state_machines().front();
+		ConstElementList list = sm->find_elements_by_types({Cyberiada::elementSimpleState,
+															Cyberiada::elementCompositeState,
+															Cyberiada::elementInitial,
+															Cyberiada::elementFinal,
+															Cyberiada::elementChoice,
+															Cyberiada::elementTerminate});
+		for (ConstElementList::const_iterator i = list.begin(); i != list.end(); i++) {
+			cout << (*i)->dump_to_str() << endl;
+		}
+	} catch (const Cyberiada::Exception& e) {
+		cerr << e.str() << endl;
+		return 1;
+	}
+	return 0;
+}