Update Nemirtingas overlay to latest.

overlay_experimental/System/ConstExpressions.hpp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) Nemirtingas
+ * This file is part of System.
+ *
+ * System is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * System is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with System; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <cstddef> // size_t
+
+namespace System {
+namespace ConstExpr {
+    template<typename T, size_t N>
+    constexpr size_t CountOf(T(&)[N])
+    {
+        return N;
+    }
+
+    template<typename T, size_t N>
+    constexpr size_t StrLen(T(&)[N])
+    {
+        return N-1;
+    }
+
+    // Sum of all parameter pack sizeof
+    template <typename... Ts>
+    constexpr size_t size_of = 0;
+
+    template <typename T, typename... Ts>
+    constexpr size_t size_of<T, Ts...> = sizeof(T) + size_of<Ts...>;
+}
+}