...trying out boost with luabind

luabind/luabind/discard_result_policy.hpp

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+// Copyright (c) 2003 Daniel Wallin and Arvid Norberg
+
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+// OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+#ifndef LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED
+#define LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED
+
+#include <luabind/config.hpp>
+#include <luabind/detail/policy.hpp>
+
+namespace luabind { namespace detail 
+{
+	struct discard_converter
+	{
+		template<class T>
+		void apply(lua_State*, T) {}
+	};
+
+	struct discard_result_policy : conversion_policy<0>
+	{
+		static void precall(lua_State*, const index_map&) {}
+		static void postcall(lua_State*, const index_map&) {}
+
+		struct can_only_convert_from_cpp_to_lua {};
+
+		template<class T, class Direction>
+		struct apply
+		{
+			typedef typename boost::mpl::if_<boost::is_same<Direction, cpp_to_lua>
+				, discard_converter
+				, can_only_convert_from_cpp_to_lua
+			>::type type;
+		};
+	};
+
+}}
+
+namespace luabind
+{
+  detail::policy_cons<
+      detail::discard_result_policy, detail::null_type> const discard_result = {};
+
+  namespace detail
+  {
+    inline void ignore_unused_discard_result()
+    {
+        (void)discard_result;
+    }
+  }
+}
+
+#endif // LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED
+