Finalized the implementation

impl_generator.cpp

@@ -0,0 +1,25 @@
+#include "impl_generator.h"
+
+ImplGenerator::ImplGenerator(int nr_entries)
+    : m_nr_entries{nr_entries}
+{}
+
+int ImplGenerator::get_next_num()
+{
+    int num;
+    do
+    {
+        num = get_next_num_internal();
+    }
+    while (already_generated_numbers.count(num) > 0);
+    
+    internal_counter++;
+
+    return num;
+}
+
+
+bool ImplGenerator::has_more_numbers()
+{
+    return internal_counter < m_nr_entries;
+}