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/*=============================================================================
Copyright (c) 2014 Kohei Takahashi
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)
==============================================================================*/
#if !defined(BOOST_FUSION_BUILD_STD_TUPLE_05292014_0100)
#define BOOST_FUSION_BUILD_STD_TUPLE_05292014_0100
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/iterator/equal_to.hpp>
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/value_of.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <tuple>
namespace boost { namespace fusion { namespace detail
{
template <typename First, typename Last
, bool is_empty = result_of::equal_to<First, Last>::value
>
struct build_std_tuple;
template <typename First, typename Last>
struct build_std_tuple<First, Last, true>
{
typedef std::tuple<> type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(First const&, Last const&)
{
return type();
}
};
template <int ...> struct indexed_tuple { };
template <int, typename = indexed_tuple<>>
struct make_indexed_tuple;
template <int Head, int ...Tail>
struct make_indexed_tuple<Head, indexed_tuple<Tail...>>
{
typedef typename
boost::mpl::eval_if_c<
(Head == 0),
boost::mpl::identity<indexed_tuple<Tail...>>,
make_indexed_tuple<Head - 1, indexed_tuple<Head - 1, Tail...>>
>::type
type;
};
template <typename T, typename Rest>
struct push_front_std_tuple;
template <typename T, typename ...Rest>
struct push_front_std_tuple<T, std::tuple<Rest...>>
{
typedef std::tuple<T, Rest...> type;
template <int ...I>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
indexed_call(T const& first, std::tuple<Rest...> const& rest, indexed_tuple<I...>)
{
return type(first, std::get<I>(rest)...);
}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(T const& first, std::tuple<Rest...> const& rest)
{
typedef typename make_indexed_tuple<sizeof...(Rest)>::type gen;
return indexed_call(first, rest, gen());
}
};
template <typename First, typename Last>
struct build_std_tuple<First, Last, false>
{
typedef
build_std_tuple<typename result_of::next<First>::type, Last>
next_build_std_tuple;
typedef push_front_std_tuple<
typename result_of::value_of<First>::type
, typename next_build_std_tuple::type>
push_front;
typedef typename push_front::type type;
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(First const& f, Last const& l)
{
typename result_of::value_of<First>::type v = *f;
return push_front::call(
v, next_build_std_tuple::call(fusion::next(f), l));
}
};
}}}
#endif
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