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Diffstat (limited to 'boost/local_function/aux_/preprocessor/traits/param.hpp')
| -rw-r--r-- | boost/local_function/aux_/preprocessor/traits/param.hpp | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/boost/local_function/aux_/preprocessor/traits/param.hpp b/boost/local_function/aux_/preprocessor/traits/param.hpp new file mode 100644 index 0000000000..641cd81766 --- /dev/null +++ b/boost/local_function/aux_/preprocessor/traits/param.hpp @@ -0,0 +1,36 @@ + +// Copyright (C) 2009-2012 Lorenzo Caminiti +// Distributed under the Boost Software License, Version 1.0 +// (see accompanying file LICENSE_1_0.txt or a copy at +// http://www.boost.org/LICENSE_1_0.txt) +// Home at http://www.boost.org/libs/local_function + +#ifndef BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_ +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_HPP_ + +#include <boost/preprocessor/tuple/elem.hpp> + +// PRIVATE // + +// Param 2-tuple `([auto | register] type name, default_value)`. +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_ 0 +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_ 1 +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_ 2 + +// PUBLIC // + +// Expand: `[auto | register] type_ name_` (parameter declaration). +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DECL(param_traits) \ + BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \ + BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DECL_, param_traits) + +// Expand: `default ... EMPTY()` if default value, `EMPTY()` otherwise. +// Leading default is kept because default value might not be alphanumeric +// (e.g., -123) so failing `CAT` for `IS_EMPTY` check. +#define BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_DEFAULT(param_traits) \ + BOOST_PP_TUPLE_ELEM(BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_MAX_, \ + BOOST_LOCAL_FUNCTION_AUX_PP_PARAM_TRAITS_INDEX_DEFAULT_, \ + param_traits)(/* expand EMPTY */) + +#endif // #include guard + |