SWIG: test callback & output grabbing

client/include/pm3_helper.hpp

@@ -0,0 +1,10 @@
+#ifndef LIBPM3HELPERPP_H
+#define LIBPM3HELPERPP_H
+
+class ConsoleHandler {
+public:
+  virtual int handle_output(char *string) = 0;
+  virtual ~ConsoleHandler() {}
+};
+
+#endif // LIBPM3HELPERPP_H