Added macro helper for Registrar

include/aidge/utils/Registrar.hpp

@@ -141,4 +141,13 @@ void declare_registrable(py::module& m, const std::string& class_name){
 
 }
 
+#define CONCAT(a, b) CONCAT_INNER(a, b)
+#define CONCAT_INNER(a, b) a ## b
+
+#define REGISTRAR(cls, ...) \
+    namespace { \
+    static Registrar<cls> CONCAT(CONCAT(aidge_register_ , cls), __COUNTER__)(__VA_ARGS__); \
+    } \
+    static_assert(true, "")
+
 #endif //AIDGE_CORE_UTILS_REGISTRAR_H_