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68 lines
2.2 KiB
68 lines
2.2 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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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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