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compose.hpp
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// Copyright Cromwell D. Enage 2019. // 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_COMPOSE_HPP #define BOOST_PARAMETER_COMPOSE_HPP #include <boost/parameter/aux_/arg_list.hpp> namespace boost { namespace parameter { inline BOOST_CONSTEXPR ::boost::parameter::aux::empty_arg_list compose() { return ::boost::parameter::aux::empty_arg_list(); } }} // namespace boost::parameter #include <boost/parameter/config.hpp> #if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) namespace boost { namespace parameter { namespace aux { #if defined(BOOST_PARAMETER_CAN_USE_MP11) template <typename ...TaggedArgs> struct compose_arg_list { using type = ::boost::parameter::aux::flat_like_arg_list< ::boost::parameter::aux::flat_like_arg_tuple< typename TaggedArgs::base_type::key_type , typename TaggedArgs::base_type >... >; }; #else // !defined(BOOST_PARAMETER_CAN_USE_MP11) template <typename TaggedArg0, typename ...TaggedArgs> struct compose_arg_list; template <typename TaggedArg0> struct compose_arg_list<TaggedArg0> { typedef ::boost::parameter::aux::arg_list<TaggedArg0> type; }; template <typename TaggedArg0, typename ...TaggedArgs> struct compose_arg_list { typedef ::boost::parameter::aux::arg_list< TaggedArg0 , typename ::boost::parameter::aux ::compose_arg_list<TaggedArgs...>::type > type; }; #endif // BOOST_PARAMETER_CAN_USE_MP11 }}} // namespace boost::parameter::aux #include <boost/parameter/are_tagged_arguments.hpp> #include <boost/core/enable_if.hpp> namespace boost { namespace parameter { namespace result_of { template <typename ...TaggedArgs> struct compose : ::boost::lazy_enable_if< ::boost::parameter::are_tagged_arguments<TaggedArgs...> , ::boost::parameter::aux::compose_arg_list<TaggedArgs...> > { }; template <> struct compose<> { typedef ::boost::parameter::aux::empty_arg_list type; }; }}} // namespace boost::parameter::result_of namespace boost { namespace parameter { template <typename TaggedArg0, typename ...TaggedArgs> inline BOOST_CONSTEXPR typename ::boost::parameter::result_of ::compose<TaggedArg0,TaggedArgs...>::type compose(TaggedArg0 const& arg0, TaggedArgs const&... args) { return typename ::boost::parameter::aux ::compose_arg_list<TaggedArg0,TaggedArgs...>::type( ::boost::parameter::aux::value_type_is_not_void() , arg0 , args... ); } }} // namespace boost::parameter #else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING) #define BOOST_PARAMETER_compose_arg_list_type_suffix(z, n, suffix) suffix #include <boost/preprocessor/cat.hpp> #define BOOST_PARAMETER_compose_arg_list_type_prefix(z, n, prefix) \ ::boost::parameter::aux::arg_list<BOOST_PP_CAT(prefix, n) /**/ #include <boost/preprocessor/facilities/intercept.hpp> #include <boost/preprocessor/repetition/enum.hpp> #include <boost/preprocessor/repetition/repeat.hpp> #define BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \ BOOST_PP_CAT(BOOST_PP_ENUM_, z)( \ n, BOOST_PARAMETER_compose_arg_list_type_prefix, prefix \ ) BOOST_PP_CAT(BOOST_PP_REPEAT_, z)( \ n, BOOST_PARAMETER_compose_arg_list_type_suffix, > \ ) /**/ #include <boost/parameter/aux_/void.hpp> #include <boost/preprocessor/arithmetic/inc.hpp> #include <boost/preprocessor/arithmetic/sub.hpp> #include <boost/preprocessor/repetition/enum_params.hpp> #include <boost/preprocessor/repetition/enum_binary_params.hpp> #include <boost/preprocessor/repetition/enum_trailing_params.hpp> #if defined(BOOST_NO_SFINAE) #define BOOST_PARAMETER_compose_arg_list_function_overload(z, n, prefix) \ template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \ inline BOOST_CONSTEXPR \ BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \ compose(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, prefix, const& a)) \ { \ return BOOST_PARAMETER_compose_arg_list_type(z, n, prefix)( \ BOOST_PP_ENUM_PARAMS_Z(z, n, a) \ BOOST_PP_ENUM_TRAILING_PARAMS_Z( \ z \ , BOOST_PP_SUB(BOOST_PARAMETER_COMPOSE_MAX_ARITY, n) \ , ::boost::parameter::aux::void_reference() BOOST_PP_INTERCEPT \ ) \ ); \ } /**/ #else // !defined(BOOST_NO_SFINAE) #include <boost/parameter/are_tagged_arguments.hpp> #include <boost/core/enable_if.hpp> namespace boost { namespace parameter { namespace result_of { template < BOOST_PP_ENUM_BINARY_PARAMS( BOOST_PP_INC(BOOST_PARAMETER_COMPOSE_MAX_ARITY) , typename TaggedArg , = void BOOST_PP_INTERCEPT ) > struct compose; template <> struct compose<> { typedef ::boost::parameter::aux::empty_arg_list type; }; }}} // namespace boost::parameter::result_of #define BOOST_PARAMETER_compose_arg_list_function_overload(z, n, prefix) \ namespace boost { namespace parameter { namespace result_of { \ template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \ struct compose<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)> \ : ::boost::enable_if< \ ::boost::parameter \ ::are_tagged_arguments<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)> \ , BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \ > \ { \ }; \ }}} \ namespace boost { namespace parameter { \ template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \ inline BOOST_CONSTEXPR typename ::boost::parameter::result_of \ ::compose<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)>::type \ compose(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, prefix, const& a)) \ { \ return BOOST_PARAMETER_compose_arg_list_type(z, n, prefix)( \ BOOST_PP_ENUM_PARAMS_Z(z, n, a) \ BOOST_PP_ENUM_TRAILING_PARAMS_Z( \ z \ , BOOST_PP_SUB(BOOST_PARAMETER_COMPOSE_MAX_ARITY, n) \ , ::boost::parameter::aux::void_reference() BOOST_PP_INTERCEPT \ ) \ ); \ } \ }} /**/ #endif // BOOST_NO_SFINAE #include <boost/preprocessor/repetition/repeat_from_to.hpp> BOOST_PP_REPEAT_FROM_TO( 1 , BOOST_PP_INC(BOOST_PARAMETER_COMPOSE_MAX_ARITY) , BOOST_PARAMETER_compose_arg_list_function_overload , TaggedArg ) #undef BOOST_PARAMETER_compose_arg_list_function_overload #undef BOOST_PARAMETER_compose_arg_list_type #undef BOOST_PARAMETER_compose_arg_list_type_prefix #undef BOOST_PARAMETER_compose_arg_list_type_suffix #endif // BOOST_PARAMETER_HAS_PERFECT_FORWARDING #endif // include guard