Finalized the implementation

device_generator.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "impl_generator.h"
+
+class DeviceGenerator: public ImplGenerator
+{
+    public:
+    DeviceGenerator(int max_range, int num_entries);
+    int get_next_num_internal() override;
+
+    private:
+    int m_max_range;
+    int m_num_entries;
+};