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///////////////////////////////////////////////////////////////////////////////
/// \file template_arity.hpp
/// Replace all nodes stored by reference by nodes stored by value.
//
// Copyright 2011 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// This file is based on a similar one in MPL from Aleksey Gurtovoy.
#ifndef BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
#define BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
// Somewhat indirect definition of BOOST_PROTO_TEMPLATE_ARITY_PARAM is
// to overcome a shortcoming of the Wave tool used to generate the
// pre-preprocessed headers.
#define BOOST_PROTO_TEMPLATE_ARITY_PARAM BOOST_PROTO_TEMPLATE_ARITY_PARAM2
#define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param)
#if defined(BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING) || \
(defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES))
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/inc.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/mpl/int.hpp>
#include <boost/proto/proto_fwd.hpp>
#undef BOOST_PROTO_TEMPLATE_ARITY_PARAM2
#define BOOST_PROTO_TEMPLATE_ARITY_PARAM2(param) , param
namespace boost { namespace proto { namespace detail
{
sized_type<1>::type template_arity_helper(...);
// Other overloads generated by the preprocessor
#include <boost/proto/detail/template_arity_helper.hpp>
template<typename F, int N, int Size>
struct template_arity_impl2
: mpl::int_<Size - 1>
{};
template<typename F, int N = BOOST_PROTO_MAX_ARITY>
struct template_arity
: template_arity_impl2<
F
, N
, sizeof(detail::template_arity_helper((F **)0, (mpl::int_<N> *)0))
>
{};
template<typename F, int N>
struct template_arity_impl2<F, N, 1>
: template_arity<F, N-1>
{};
template<typename F>
struct template_arity_impl2<F, 0, 1>
: mpl::int_<-1>
{};
}}}
#endif // BOOST_PROTO_EXTENDED_TEMPLATE_PARAMETERS_MATCHING
#endif // BOOST_PROTO_DETAIL_TEMPLATE_ARITY_HPP_EAN_2011_05_07
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