[ox/claw] Add missing write.cpp

deps/ox/src/ox/claw/write.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016 - 2020 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "write.hpp"
+
+namespace ox::detail {
+
+struct versioned_type {
+	static constexpr int TypeVersion = 4;
+};
+
+struct unversioned_type {
+};
+
+static_assert(type_version<versioned_type>::value == 4);
+static_assert(type_version<unversioned_type>::value == -1);
+
+}