added an example for adding new parameters to classes. However this o…

…ne does not work, must be activated once it works

examples/undocumented/libshogun/Makefile

@@ -104,6 +104,7 @@ TARGETS = basic_minimal \
 		  library_serialization \
 		  classifier_svmlight_string_features_precomputed_kernel \
   		  classifier_mkl_svmlight_modelselection_bug \
+  		  base_migration_new_buggy \
 
 
 all: $(TARGETS)

examples/undocumented/libshogun/base_migration_new_buggy.cpp

@@ -0,0 +1,95 @@
+/*
+ * 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.
+ *
+ * Written (W) 2012 Heiko Strathmann
+ * Copyright (C) 2012 Berlin Institute of Technology and Max-Planck-Society
+ */
+
+#include <shogun/base/init.h>
+#include <shogun/base/Parameter.h>
+#include <shogun/io/SerializableAsciiFile.h>
+#include <shogun/base/ParameterMap.h>
+
+using namespace shogun;
+
+class CTestClassOld : public CSGObject
+{
+public:
+	CTestClassOld()
+	{
+
+	}
+
+	virtual const char* get_name() const { return "TestClassOld"; }
+};
+
+class CTestClassNew : public CSGObject
+{
+public:
+	CTestClassNew()
+	{
+		m_number=3;
+		m_parameters->add(&m_number, "m_number", "");
+
+		/* this parameter is new in this version, mapping from "nowhere" */
+		m_parameter_map->put(
+				new SGParamInfo("m_number", CT_SCALAR, ST_NONE, PT_INT32, 1),
+				new SGParamInfo()
+		);
+
+		/* note that dropped parameters need not be considered, just ignored */
+
+		/* needed if more than one element */
+		m_parameter_map->finalize_map();
+	}
+
+	int32_t m_number;
+
+	virtual const char* get_name() const { return "TestClassNew"; }
+
+};
+
+void test()
+{
+	const char* filename="test.txt";
+
+	/* create one instance of each class */
+	CTestClassOld* old_instance=new CTestClassOld();
+	CTestClassNew* new_instance=new CTestClassNew();
+
+	CSerializableAsciiFile* file;
+
+	/* serialize int instance, use custom parameter version */
+	file=new CSerializableAsciiFile(filename, 'w');
+	old_instance->save_serializable(file, "", 0);
+	file->close();
+	SG_UNREF(file);
+
+	/* de-serialize float instance, use custom parameter version 2 which means
+	 * that the class is already one step further and the parameter which was
+	 * added in version 1 has to be migrated (which is done automatically) */
+	// change this version to two once it works!
+	file=new CSerializableAsciiFile(filename, 'r');
+	new_instance->load_serializable(file, "", 1);
+	file->close();
+	SG_UNREF(file);
+
+	SG_UNREF(old_instance);
+	SG_UNREF(new_instance);
+	SG_UNREF(file);
+}
+
+int main(int argc, char **argv)
+{
+	init_shogun_with_defaults();
+
+	test();
+
+	exit_shogun();
+
+	return 0;
+}
+