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nested_keyword.hpp
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// Copyright Eric Niebler 2005. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_PARAMETER_NESTED_KEYWORD_HPP #define BOOST_PARAMETER_NESTED_KEYWORD_HPP #include <boost/parameter/aux_/name.hpp> #include <boost/parameter/keyword.hpp> #include <boost/parameter/config.hpp> #include <boost/preprocessor/cat.hpp> #include <boost/preprocessor/stringize.hpp> #if defined(BOOST_PARAMETER_CAN_USE_MP11) #define BOOST_PARAMETER_NESTED_KEYWORD_AUX(tag_namespace, q, name, alias) \ namespace tag_namespace \ { \ template <int Dummy = 0> \ struct BOOST_PP_CAT(name, _) \ { \ static BOOST_CONSTEXPR char const* keyword_name() \ { \ return BOOST_PP_STRINGIZE(name); \ } \ using _ = BOOST_PARAMETER_TAG_PLACEHOLDER_TYPE( \ BOOST_PP_CAT(name, _)<Dummy> \ ); \ using _1 = BOOST_PARAMETER_TAG_PLACEHOLDER_TYPE( \ BOOST_PP_CAT(name, _)<Dummy> \ ); \ BOOST_PARAMETER_TAG_MP11_PLACEHOLDER_BINDING( \ binding_fn \ , BOOST_PP_CAT(name, _)<Dummy> \ ); \ BOOST_PARAMETER_TAG_MP11_PLACEHOLDER_VALUE( \ fn \ , BOOST_PP_CAT(name, _)<Dummy> \ ); \ using qualifier = ::boost::parameter::q; \ static ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ > const& alias; \ }; \ template <int Dummy> \ ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ > const& BOOST_PP_CAT(name, _)<Dummy>::alias \ = ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ >::instance; \ typedef BOOST_PP_CAT(name, _)<> name; \ } \ namespace \ { \ ::boost::parameter::keyword<tag_namespace::name> const& name \ = ::boost::parameter::keyword<tag_namespace::name>::instance; \ } /**/ #else // !defined(BOOST_PARAMETER_CAN_USE_MP11) #define BOOST_PARAMETER_NESTED_KEYWORD_AUX(tag_namespace, q, name, alias) \ namespace tag_namespace \ { \ template <int Dummy = 0> \ struct BOOST_PP_CAT(name, _) \ { \ static BOOST_CONSTEXPR char const* keyword_name() \ { \ return BOOST_PP_STRINGIZE(name); \ } \ typedef BOOST_PARAMETER_TAG_PLACEHOLDER_TYPE( \ BOOST_PP_CAT(name, _)<Dummy> \ ) _; \ typedef BOOST_PARAMETER_TAG_PLACEHOLDER_TYPE( \ BOOST_PP_CAT(name, _)<Dummy> \ ) _1; \ typedef ::boost::parameter::q qualifier; \ static ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ > const& alias; \ }; \ template <int Dummy> \ ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ > const& BOOST_PP_CAT(name, _)<Dummy>::alias \ = ::boost::parameter::keyword< \ BOOST_PP_CAT(name, _)<Dummy> \ >::instance; \ typedef BOOST_PP_CAT(name, _)<> name; \ } \ namespace \ { \ ::boost::parameter::keyword<tag_namespace::name> const& name \ = ::boost::parameter::keyword<tag_namespace::name>::instance; \ } /**/ #endif // BOOST_PARAMETER_CAN_USE_MP11 #include <boost/parameter/aux_/preprocessor/qualifier.hpp> #define BOOST_PARAMETER_NESTED_KEYWORD(tag_namespace, name, alias) \ BOOST_PARAMETER_NESTED_KEYWORD_AUX( \ tag_namespace \ , BOOST_PARAMETER_GET_QUALIFIER(name) \ , BOOST_PARAMETER_UNQUALIFIED(name) \ , alias \ ) /**/ #endif // include guard