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211 lines
8.2 KiB
211 lines
8.2 KiB
5 years ago
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// Copyright Cromwell D. Enage 2019.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PARAMETER_COMPOSE_HPP
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#define BOOST_PARAMETER_COMPOSE_HPP
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#include <boost/parameter/aux_/arg_list.hpp>
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namespace boost { namespace parameter {
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inline BOOST_CONSTEXPR ::boost::parameter::aux::empty_arg_list compose()
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{
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return ::boost::parameter::aux::empty_arg_list();
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}
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}} // namespace boost::parameter
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#include <boost/parameter/config.hpp>
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#if defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
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namespace boost { namespace parameter { namespace aux {
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#if defined(BOOST_PARAMETER_CAN_USE_MP11)
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template <typename ...TaggedArgs>
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struct compose_arg_list
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{
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using type = ::boost::parameter::aux::flat_like_arg_list<
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::boost::parameter::aux::flat_like_arg_tuple<
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typename TaggedArgs::base_type::key_type
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, typename TaggedArgs::base_type
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>...
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>;
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};
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#else // !defined(BOOST_PARAMETER_CAN_USE_MP11)
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template <typename TaggedArg0, typename ...TaggedArgs>
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struct compose_arg_list;
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template <typename TaggedArg0>
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struct compose_arg_list<TaggedArg0>
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{
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typedef ::boost::parameter::aux::arg_list<TaggedArg0> type;
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};
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template <typename TaggedArg0, typename ...TaggedArgs>
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struct compose_arg_list
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{
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typedef ::boost::parameter::aux::arg_list<
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TaggedArg0
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, typename ::boost::parameter::aux
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::compose_arg_list<TaggedArgs...>::type
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> type;
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};
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#endif // BOOST_PARAMETER_CAN_USE_MP11
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}}} // namespace boost::parameter::aux
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#include <boost/parameter/are_tagged_arguments.hpp>
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#include <boost/core/enable_if.hpp>
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namespace boost { namespace parameter { namespace result_of {
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template <typename ...TaggedArgs>
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struct compose
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: ::boost::lazy_enable_if<
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::boost::parameter::are_tagged_arguments<TaggedArgs...>
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, ::boost::parameter::aux::compose_arg_list<TaggedArgs...>
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>
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{
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};
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template <>
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struct compose<>
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{
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typedef ::boost::parameter::aux::empty_arg_list type;
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};
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}}} // namespace boost::parameter::result_of
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namespace boost { namespace parameter {
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template <typename TaggedArg0, typename ...TaggedArgs>
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inline BOOST_CONSTEXPR typename ::boost::parameter::result_of
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::compose<TaggedArg0,TaggedArgs...>::type
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compose(TaggedArg0 const& arg0, TaggedArgs const&... args)
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{
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return typename ::boost::parameter::aux
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::compose_arg_list<TaggedArg0,TaggedArgs...>::type(
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::boost::parameter::aux::value_type_is_not_void()
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, arg0
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, args...
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);
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}
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}} // namespace boost::parameter
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#else // !defined(BOOST_PARAMETER_HAS_PERFECT_FORWARDING)
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#define BOOST_PARAMETER_compose_arg_list_type_suffix(z, n, suffix) suffix
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#include <boost/preprocessor/cat.hpp>
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#define BOOST_PARAMETER_compose_arg_list_type_prefix(z, n, prefix) \
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::boost::parameter::aux::arg_list<BOOST_PP_CAT(prefix, n)
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/**/
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#include <boost/preprocessor/facilities/intercept.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/repeat.hpp>
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#define BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \
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BOOST_PP_CAT(BOOST_PP_ENUM_, z)( \
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n, BOOST_PARAMETER_compose_arg_list_type_prefix, prefix \
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) BOOST_PP_CAT(BOOST_PP_REPEAT_, z)( \
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n, BOOST_PARAMETER_compose_arg_list_type_suffix, > \
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)
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/**/
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#include <boost/parameter/aux_/void.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/arithmetic/sub.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_binary_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#if defined(BOOST_NO_SFINAE)
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#define BOOST_PARAMETER_compose_arg_list_function_overload(z, n, prefix) \
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template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \
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inline BOOST_CONSTEXPR \
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BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \
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compose(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, prefix, const& a)) \
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{ \
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return BOOST_PARAMETER_compose_arg_list_type(z, n, prefix)( \
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BOOST_PP_ENUM_PARAMS_Z(z, n, a) \
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BOOST_PP_ENUM_TRAILING_PARAMS_Z( \
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z \
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, BOOST_PP_SUB(BOOST_PARAMETER_COMPOSE_MAX_ARITY, n) \
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, ::boost::parameter::aux::void_reference() BOOST_PP_INTERCEPT \
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) \
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); \
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}
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/**/
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#else // !defined(BOOST_NO_SFINAE)
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#include <boost/parameter/are_tagged_arguments.hpp>
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#include <boost/core/enable_if.hpp>
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namespace boost { namespace parameter { namespace result_of {
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template <
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BOOST_PP_ENUM_BINARY_PARAMS(
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BOOST_PP_INC(BOOST_PARAMETER_COMPOSE_MAX_ARITY)
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, typename TaggedArg
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, = void BOOST_PP_INTERCEPT
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)
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>
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struct compose;
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template <>
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struct compose<>
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{
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typedef ::boost::parameter::aux::empty_arg_list type;
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};
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}}} // namespace boost::parameter::result_of
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#define BOOST_PARAMETER_compose_arg_list_function_overload(z, n, prefix) \
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namespace boost { namespace parameter { namespace result_of { \
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template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \
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struct compose<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)> \
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: ::boost::enable_if< \
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::boost::parameter \
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::are_tagged_arguments<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)> \
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, BOOST_PARAMETER_compose_arg_list_type(z, n, prefix) \
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> \
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{ \
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}; \
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}}} \
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namespace boost { namespace parameter { \
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template <BOOST_PP_ENUM_PARAMS_Z(z, n, typename prefix)> \
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inline BOOST_CONSTEXPR typename ::boost::parameter::result_of \
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::compose<BOOST_PP_ENUM_PARAMS_Z(z, n, prefix)>::type \
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compose(BOOST_PP_ENUM_BINARY_PARAMS_Z(z, n, prefix, const& a)) \
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{ \
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return BOOST_PARAMETER_compose_arg_list_type(z, n, prefix)( \
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BOOST_PP_ENUM_PARAMS_Z(z, n, a) \
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BOOST_PP_ENUM_TRAILING_PARAMS_Z( \
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z \
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, BOOST_PP_SUB(BOOST_PARAMETER_COMPOSE_MAX_ARITY, n) \
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, ::boost::parameter::aux::void_reference() BOOST_PP_INTERCEPT \
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) \
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); \
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} \
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}}
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/**/
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#endif // BOOST_NO_SFINAE
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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BOOST_PP_REPEAT_FROM_TO(
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1
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, BOOST_PP_INC(BOOST_PARAMETER_COMPOSE_MAX_ARITY)
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, BOOST_PARAMETER_compose_arg_list_function_overload
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, TaggedArg
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)
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#undef BOOST_PARAMETER_compose_arg_list_function_overload
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#undef BOOST_PARAMETER_compose_arg_list_type
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#undef BOOST_PARAMETER_compose_arg_list_type_prefix
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#undef BOOST_PARAMETER_compose_arg_list_type_suffix
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#endif // BOOST_PARAMETER_HAS_PERFECT_FORWARDING
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#endif // include guard
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