1 2 // Copyright (C) 2009-2012 Lorenzo Caminiti 3 // Distributed under the Boost Software License, Version 1.0 4 // (see accompanying file LICENSE_1_0.txt or a copy at 5 // http://www.boost.org/LICENSE_1_0.txt) 6 // Home at http://www.boost.org/libs/local_function 7 8 #ifndef BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_ 9 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_ 10 11 #include <boost/preprocessor/tuple/elem.hpp> 12 13 // PRIVATE // 14 15 // Param 2-tuple `([auto | register] type name, default_value)`. 16 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_ 0 17 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_ 1 18 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_ 2 19 20 // PUBLIC // 21 22 // Expand: `[auto | register] type_ name_` (parameter declaration). 23 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DECL(param_traits) \ 24 BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \ 25 BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_, param_traits) 26 27 // Expand: `default ... EMPTY()` if default value, `EMPTY()` otherwise. 28 // Leading default is kept because default value might not be alphanumeric 29 // (e.g., -123) so failing `CAT` for `IS_EMPTY` check. 30 #define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DEFAULT(param_traits) \ 31 BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \ 32 BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_, \ 33 param_traits)(/* expand EMPTY */) 34 35 #endif // #include guard 36 37