/*=============================================================================
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Copyright (c) 2012 Paul Fultz II
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join.h
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Distributed under the Boost 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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#ifndef BOOST_HOF_GUARD_FUNCTION_DETAIL_JOIN_H
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#define BOOST_HOF_GUARD_FUNCTION_DETAIL_JOIN_H
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#include <boost/hof/detail/holder.hpp>
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namespace boost { namespace hof { namespace detail {
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template<class... Ts>
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struct join_args
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{};
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template<template <class...> class T, class Args, class=void>
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struct join_impl
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{};
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template<template <class...> class T, class... Args>
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struct join_impl<T, join_args<Args...>, typename holder<
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T<Args...>
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>::type>
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{ typedef T<Args...> type; };
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template<template <class...> class T, class... Args>
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struct join
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: join_impl<T, join_args<Args...>>
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{};
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}}} // namespace boost::hof
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#if defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 7
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#define BOOST_HOF_JOIN(c, ...) typename boost::hof::detail::join<c, __VA_ARGS__>::type
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#else
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#define BOOST_HOF_JOIN(c, ...) c<__VA_ARGS__>
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#endif
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#endif
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