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Add convert implementation for std::tuple

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Signed-off-by: Kohei Takahashi <flast@flast.jp>
This commit is contained in:
Kohei Takahashi
2012-10-17 19:59:44 +09:00
parent 39785ddb0e
commit 219b4124d7
3 changed files with 154 additions and 0 deletions
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1
include/boost/fusion/adapted/std_tuple.hpp
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@ -16,6 +16,7 @@
#include <boost/fusion/adapted/std_tuple/detail/size_impl.hpp>
#include <boost/fusion/adapted/std_tuple/detail/at_impl.hpp>
#include <boost/fusion/adapted/std_tuple/detail/value_at_impl.hpp>
#include <boost/fusion/adapted/std_tuple/detail/convert_impl.hpp>
#include <boost/fusion/adapted/std_tuple/std_tuple_iterator.hpp>
#include <boost/fusion/adapted/std_tuple/tag_of.hpp>

105
include/boost/fusion/adapted/std_tuple/detail/build_std_tuple.hpp Normal file
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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_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_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_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_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

48
include/boost/fusion/adapted/std_tuple/detail/convert_impl.hpp Normal file
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/*=============================================================================
Copyright (c) 2012-2014 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_CONVERT_IMPL_10172012_0940)
#define BOOST_FUSION_CONVERT_IMPL_10172012_0940
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/adapted/std_tuple/detail/build_std_tuple.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
namespace boost { namespace fusion
{
struct std_tuple_tag;
namespace extension
{
template <typename T>
struct convert_impl;
template <>
struct convert_impl<std_tuple_tag>
{
template <typename Sequence>
struct apply
{
typedef detail::build_std_tuple<
typename result_of::begin<Sequence>::type
, typename result_of::end<Sequence>::type
> gen;
typedef typename gen::type type;
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& seq)
{
return gen::call(begin(seq), end(seq));
}
};
};
}
}}
#endif