FBasicParticle: simplify `attributes` method implementation

Src/Components/FBasicParticle.hpp

@@ -194,9 +194,7 @@ public:
      */
     types_tuple_t attributes() const {
         return attributes_impl(
-            std::make_index_sequence<std::tuple_size<types_tuple_t>::value>(),
-            types_tuple_t()
-            );
+            std::make_index_sequence<std::tuple_size<types_tuple_t>::value>());
     }
 
     /**
@@ -276,12 +274,9 @@ private:
      *
      * \param pos new position
      */
-    template<std::size_t... Is, typename... Attributes>
-    std::tuple<Attributes...> attributes_impl(std::index_sequence<Is...>,
-                                         std::tuple<Attributes...>)
-        const
-    {
-        return std::tuple<Attributes...>(std::get<Is+Dim>(this->data())...);
+    template<std::size_t... Is>
+    types_tuple_t attributes_impl(std::index_sequence<Is...>) const {
+        return types_tuple_t(std::get<Is+Dim>(*this)...);
     }
 
 };