Tuple concatenation.

Meta/tuple_cat.h

@@ -0,0 +1,24 @@
+static_assert( __cplusplus > 2020'99 );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+#include <tuple>
+
+#include <Alepha/type_lisp.h>
+
+namespace Alepha::Hydrogen::Meta  ::detail::  tuple_cat_m
+{
+	inline namespace exports
+	{
+		template< typename Left, typename Right >
+		using tuple_cat_t= tuple_from_list_t< list_cat_t< list_from_tuple_t< Left >, list_from_tuple_t< Right > > >;
+	}
+}
+
+namespace Alepha::Hydrogen::Meta::inline exports::inline tuple_cat_m
+{
+	using namespace detail::tuple_cat_m::exports;
+}
+