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67 lines
2.2 KiB
67 lines
2.2 KiB
/////////////////////////////////////////////////////////////////////////////// |
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/// \file template_arity.hpp |
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/// Replace all nodes stored by reference by nodes stored by value. |
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// |
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// Copyright 2011 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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// |
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// This file is based on a similar one in MPL from Aleksey Gurtovoy. |
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#ifndef BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07 |
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#define BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07 |
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// Somewhat indirect definition of BOOST_PROTO_TEMPLATE_ARITY_PARAM is |
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// to overcome a shortcoming of the Wave tool used to generate the |
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// pre-preprocessed headers. |
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#define BOOST_PROTO_TEMPLATE_ARITY_PARAM BOOST_PROTO_TEMPLATE_ARITY_PARAM2 |
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#define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param) |
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#if defined(BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING) || \ |
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(defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)) |
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#include <boost/preprocessor/cat.hpp> |
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#include <boost/preprocessor/inc.hpp> |
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#include <boost/preprocessor/iteration/iterate.hpp> |
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#include <boost/preprocessor/repetition/enum_params.hpp> |
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#include <boost/mpl/int.hpp> |
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#include <boost/proto/proto_fwd.hpp> |
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#undef BOOST_PROTO_TEMPLATE_ARITY_PARAM2 |
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#define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param) , param |
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namespace boost { namespace proto { namespace detail |
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{ |
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sized_type<1>::type template_arity_helper(...); |
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// Other overloads generated by the preprocessor |
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#include <boost/proto/detail/template_arity_helper.hpp> |
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template<typename F, int N, int Size> |
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struct template_arity_impl2 |
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: mpl::int_<Size - 1> |
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{}; |
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template<typename F, int N = BOOST_PROTO_MAX_ARITY> |
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struct template_arity |
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: template_arity_impl2< |
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F |
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, N |
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, sizeof(detail::template_arity_helper((F **)0, (mpl::int_<N> *)0)) |
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> |
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{}; |
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template<typename F, int N> |
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struct template_arity_impl2<F, N, 1> |
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: template_arity<F, N-1> |
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{}; |
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template<typename F> |
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struct template_arity_impl2<F, 0, 1> |
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: mpl::int_<-1> |
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{}; |
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}}} |
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#endif // BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING |
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#endif // BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
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