Added package dependencies and dependants filter

src/class_diagram/model/class.h

@@ -26,6 +26,8 @@
 #include "common/model/stylable_element.h"
 #include "type_alias.h"
 
+#include <type_safe/reference.hpp>
+
 #include <string>
 #include <vector>
 
@@ -90,3 +92,17 @@ private:
 };
 
 }
+
+namespace std {
+template <>
+struct hash<
+    type_safe::object_ref<const clanguml::class_diagram::model::class_>> {
+    std::size_t operator()(const type_safe::object_ref<
+        const clanguml::class_diagram::model::class_> &key) const
+    {
+        using clanguml::class_diagram::model::class_;
+
+        return std::hash<std::string>{}(key.get().full_name(false));
+    }
+};
+}