cleans up project and adds axi4_pin_level test

src/factory.h

@@ -0,0 +1,78 @@
+/*
+ * according to https://forums.accellera.org/topic/5754-unit-testing-with-gtest/
+ * factory.h
+ *
+ *  Created on: Oct 1, 2022
+ *      Author: eyck
+ */
+
+#ifndef SRC_FACTORY_H_
+#define SRC_FACTORY_H_
+
+#include <map>
+#include <string>
+#include <memory>
+#include <functional>
+
+class factory {
+public:
+    static factory& get_instance();
+
+    template<typename T, typename ...Args>
+    class add {
+    public:
+        add(Args&&... args);
+
+        add(const std::string& name, Args&&... args);
+    };
+
+    template<typename T>
+    static T& get(const std::string& name = "");
+
+    void create();
+
+    void destroy();
+private:
+    using destructor = std::function<void(void*)>;
+    using object = std::unique_ptr<void, destructor>;
+    using constructor = std::function<object(void)>;
+
+    factory();
+
+    factory(const factory& other) = delete;
+
+    factory& operator=(const factory& other) = delete;
+
+    void add_object(const std::string& name, constructor create);
+
+    void* get_object(const std::string& name);
+
+    std::map<std::string, constructor> m_constructors;
+    std::map<std::string, object> m_objects;
+};
+
+template<typename T, typename ...Args>
+factory::add<T, Args...>::add(Args&&... args) {
+    add("", args...);
+}
+
+template<typename T, typename ...Args>
+factory::add<T, Args...>::add(const std::string& name, Args&&... args) {
+    factory::get_instance().add_object(name,
+        [args...] () -> object {
+            return object{
+                new T(std::forward<Args>(args)...),
+                [] (void* obj) {
+                    delete static_cast<T*>(obj);
+                }
+            };
+        }
+    );
+}
+
+template<typename T> auto
+factory::get(const std::string& name) -> T& {
+    return *static_cast<T*>(factory::get_instance().get_object(name));
+}
+
+#endif /* SRC_FACTORY_H_ */