Added makearray

src/makearray.h

@@ -0,0 +1,30 @@
+#pragma once
+
+// system includes
+#include <array>
+
+namespace goe {
+namespace details {
+  template<class> struct is_ref_wrapper : std::false_type {};
+  template<class T> struct is_ref_wrapper<std::reference_wrapper<T>> : std::true_type {};
+
+  template<class T>
+  using not_ref_wrapper = std::negation<is_ref_wrapper<std::decay_t<T>>>;
+
+  template <class D, class...> struct return_type_helper { using type = D; };
+  template <class... Types>
+  struct return_type_helper<void, Types...> : std::common_type<Types...> {
+      //static_assert(std::conjunction_v<not_ref_wrapper<Types>...>,
+      //              "Types cannot contain reference_wrappers when D is void");
+  };
+
+  template <class D, class... Types>
+  using return_type = std::array<typename return_type_helper<D, Types...>::type,
+                                 sizeof...(Types)>;
+} // namespace details
+
+template < class D = void, class... Types>
+constexpr details::return_type<D, Types...> make_array(Types&&... t) {
+  return {std::forward<Types>(t)... };
+}
+} // namespace goe