Fixed unsupported std::void_t

include/aidge/utils/DynamicAttributes.hpp

@@ -34,12 +34,23 @@ namespace py = pybind11;
 
 
 namespace Aidge {
+#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
+#define AIDGE_DYNATTR_HAVE_CPP17
+#endif
+
+#if defined(AIDGE_DYNATTR_HAVE_CPP17) || defined(__cpp_lib_void_t)
+using std::void_t;
+#else
+template <typename...>
+using void_t = void;
+#endif
+
 // Detection idiom to check if a type T has a less-than operator
 template <typename T, typename = void>
 struct has_less_than_operator : std::false_type {};
 
 template <typename T>
-struct has_less_than_operator<T, std::void_t<decltype(std::declval<T>() < std::declval<T>())>> : std::true_type {};
+struct has_less_than_operator<T, void_t<decltype(std::declval<T>() < std::declval<T>())>> : std::true_type {};
 
 ///\todo store also a fix-sized code that indicates the type
 ///\todo managing complex types or excluding non-trivial, non-aggregate types