1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg 2 3 // Permission is hereby granted, free of charge, to any person obtaining a 4 // copy of this software and associated documentation files (the "Software"), 5 // to deal in the Software without restriction, including without limitation 6 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 7 // and/or sell copies of the Software, and to permit persons to whom the 8 // Software is furnished to do so, subject to the following conditions: 9 10 // The above copyright notice and this permission notice shall be included 11 // in all copies or substantial portions of the Software. 12 13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF 14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT 17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 21 // OR OTHER DEALINGS IN THE SOFTWARE. 22 23 24 #ifndef LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED 25 #define LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED 26 27 #include <luabind/config.hpp> 28 #include <luabind/detail/policy.hpp> 29 30 namespace luabind { namespace detail 31 { 32 struct discard_converter 33 { 34 template<class T> applyluabind::detail::discard_converter35 void apply(lua_State*, T) {} 36 }; 37 38 struct discard_result_policy : conversion_policy<0> 39 { precallluabind::detail::discard_result_policy40 static void precall(lua_State*, const index_map&) {} postcallluabind::detail::discard_result_policy41 static void postcall(lua_State*, const index_map&) {} 42 43 struct can_only_convert_from_cpp_to_lua {}; 44 45 template<class T, class Direction> 46 struct apply 47 { 48 typedef typename boost::mpl::if_<boost::is_same<Direction, cpp_to_lua> 49 , discard_converter 50 , can_only_convert_from_cpp_to_lua 51 >::type type; 52 }; 53 }; 54 55 }} 56 57 namespace luabind 58 { 59 detail::policy_cons< 60 detail::discard_result_policy, detail::null_type> const discard_result = {}; 61 62 namespace detail 63 { ignore_unused_discard_result()64 inline void ignore_unused_discard_result() 65 { 66 (void)discard_result; 67 } 68 } 69 } 70 71 #endif // LUABIND_DISCARD_RESULT_POLICY_HPP_INCLUDED 72 73