79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// funop.hpp
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// Contains definition of funop[n]\<\> class template.
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PP_IS_ITERATING
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#error Do not include this file directly
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#endif
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#define M0(Z, N, DATA) \
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typename proto::result_of::as_child<BOOST_PP_CAT(A, N), Domain>::type \
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/**/
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#define M1(Z, N, DATA) \
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proto::as_child<Domain>(BOOST_PP_CAT(a, N)) \
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/**/
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/// \brief A helper metafunction for computing the
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/// return type of \c proto::expr\<\>::operator().
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template<typename Expr, typename Domain BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename A)>
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struct BOOST_PP_CAT(funop, BOOST_PP_ITERATION())
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{
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typedef proto::expr<
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tag::function
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, BOOST_PP_CAT(list, BOOST_PP_INC(BOOST_PP_ITERATION()))<
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Expr &
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BOOST_PP_ENUM_TRAILING(BOOST_PP_ITERATION(), M0, ~)
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>
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> type;
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static type const call(
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Expr &expr
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(BOOST_PP_ITERATION(), A, &a)
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)
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{
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type that = {
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expr
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BOOST_PP_ENUM_TRAILING(BOOST_PP_ITERATION(), M1, ~)
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};
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return that;
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}
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};
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/// \brief A helper metafunction for computing the
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/// return type of \c proto::expr\<\>::operator().
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template<typename Expr BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename A), typename This, typename Domain>
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struct funop<Expr(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), A)), This, Domain>
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: BOOST_PP_CAT(funop, BOOST_PP_ITERATION())<
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This
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, Domain
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(
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BOOST_PP_ITERATION()
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, typename remove_reference<A
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, >::type BOOST_PP_INTERCEPT
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)
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>
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{};
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/// \brief A helper metafunction for computing the
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/// return type of \c proto::expr\<\>::operator().
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template<typename Expr BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(), typename A), typename This, typename Domain>
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struct funop<Expr const(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(), A)), This, Domain>
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: BOOST_PP_CAT(funop, BOOST_PP_ITERATION())<
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This const
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, Domain
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BOOST_PP_ENUM_TRAILING_BINARY_PARAMS(
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BOOST_PP_ITERATION()
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, typename remove_reference<A
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, >::type BOOST_PP_INTERCEPT
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)
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>
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{};
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#undef M0
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#undef M1
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