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148 lines
6.6 KiB
148 lines
6.6 KiB
// Copyright David Abrahams 2006. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// #include guards intentionally disabled. |
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// #ifndef BOOST_DETAIL_FUNCTION_N_DWA2006514_HPP |
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// # define BOOST_DETAIL_FUNCTION_N_DWA2006514_HPP |
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#include <boost/mpl/void.hpp> |
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#include <boost/mpl/apply.hpp> |
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#include <boost/preprocessor/control/if.hpp> |
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#include <boost/preprocessor/cat.hpp> |
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#include <boost/preprocessor/punctuation/comma_if.hpp> |
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#include <boost/preprocessor/repetition/enum_params.hpp> |
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
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#include <boost/preprocessor/repetition/repeat.hpp> |
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#include <boost/preprocessor/seq/fold_left.hpp> |
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#include <boost/preprocessor/seq/seq.hpp> |
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#include <boost/preprocessor/seq/for_each.hpp> |
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#include <boost/preprocessor/seq/for_each_i.hpp> |
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#include <boost/preprocessor/seq/for_each_product.hpp> |
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#include <boost/preprocessor/seq/size.hpp> |
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#include <boost/type_traits/add_const.hpp> |
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#include <boost/type_traits/remove_reference.hpp> |
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namespace boost { namespace detail { |
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# define BOOST_DETAIL_default_arg(z, n, _) \ |
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typedef mpl::void_ BOOST_PP_CAT(arg, n); |
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# define BOOST_DETAIL_function_arg(z, n, _) \ |
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typedef typename remove_reference< \ |
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typename add_const< BOOST_PP_CAT(A, n) >::type \ |
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>::type BOOST_PP_CAT(arg, n); |
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#define BOOST_DETAIL_cat_arg_counts(s, state, n) \ |
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BOOST_PP_IF( \ |
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n \ |
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, BOOST_PP_CAT(state, BOOST_PP_CAT(_, n)) \ |
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, state \ |
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) \ |
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/**/ |
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#define function_name \ |
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BOOST_PP_SEQ_FOLD_LEFT( \ |
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BOOST_DETAIL_cat_arg_counts \ |
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, BOOST_PP_CAT(function, BOOST_PP_SEQ_HEAD(args)) \ |
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, BOOST_PP_SEQ_TAIL(args)(0) \ |
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) \ |
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/**/ |
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template<typename F> |
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struct function_name |
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{ |
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BOOST_PP_REPEAT( |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY |
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, BOOST_DETAIL_default_arg |
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, ~ |
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) |
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template<typename Signature> |
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struct result {}; |
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#define BOOST_DETAIL_function_result(r, _, n) \ |
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template<typename This BOOST_PP_ENUM_TRAILING_PARAMS(n, typename A)> \ |
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struct result<This(BOOST_PP_ENUM_PARAMS(n, A))> \ |
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{ \ |
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BOOST_PP_REPEAT(n, BOOST_DETAIL_function_arg, ~) \ |
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typedef \ |
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typename BOOST_PP_CAT(mpl::apply, BOOST_MPL_LIMIT_METAFUNCTION_ARITY)<\ |
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F \ |
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BOOST_PP_ENUM_TRAILING_PARAMS( \ |
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BOOST_MPL_LIMIT_METAFUNCTION_ARITY \ |
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, arg \ |
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) \ |
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>::type \ |
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impl; \ |
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typedef typename impl::result_type type; \ |
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}; \ |
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/**/ |
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BOOST_PP_SEQ_FOR_EACH(BOOST_DETAIL_function_result, _, args) |
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# define arg_type(r, _, i, is_const) \ |
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BOOST_PP_COMMA_IF(i) BOOST_PP_CAT(A, i) BOOST_PP_CAT(const_if, is_const) & |
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# define result_(r, n, constness) \ |
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typename result< \ |
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function_name( \ |
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BOOST_PP_SEQ_FOR_EACH_I_R(r, arg_type, ~, constness) \ |
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) \ |
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> \ |
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/**/ |
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# define param(r, _, i, is_const) BOOST_PP_COMMA_IF(i) \ |
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BOOST_PP_CAT(A, i) BOOST_PP_CAT(const_if, is_const) & BOOST_PP_CAT(x, i) |
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# define param_list(r, n, constness) \ |
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BOOST_PP_SEQ_FOR_EACH_I_R(r, param, ~, constness) |
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# define call_operator(r, constness) \ |
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template<BOOST_PP_ENUM_PARAMS(BOOST_PP_SEQ_SIZE(constness), typename A)> \ |
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result_(r, BOOST_PP_SEQ_SIZE(constness), constness)::type \ |
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operator ()( param_list(r, BOOST_PP_SEQ_SIZE(constness), constness) ) const \ |
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{ \ |
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typedef result_(r, BOOST_PP_SEQ_SIZE(constness), constness)::impl impl; \ |
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return impl()(BOOST_PP_ENUM_PARAMS(BOOST_PP_SEQ_SIZE(constness), x)); \ |
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} \ |
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/**/ |
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# define const_if0 |
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# define const_if1 const |
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# define bits(z, n, _) ((0)(1)) |
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# define gen_operator(r, _, n) \ |
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BOOST_PP_SEQ_FOR_EACH_PRODUCT_R( \ |
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r \ |
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, call_operator \ |
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, BOOST_PP_REPEAT(n, bits, ~) \ |
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) \ |
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/**/ |
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BOOST_PP_SEQ_FOR_EACH( |
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gen_operator |
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, ~ |
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, args |
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) |
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# undef bits |
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# undef const_if1 |
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# undef const_if0 |
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# undef call_operator |
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# undef param_list |
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# undef param |
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# undef result_ |
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# undef default_ |
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# undef arg_type |
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# undef gen_operator |
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# undef function_name |
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# undef args |
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}; |
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}} // namespace boost::detail |
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//#endif // BOOST_DETAIL_FUNCTION_N_DWA2006514_HPP
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