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Add convert implementation for Boost.Tuple

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Signed-off-by: Kohei Takahashi <flast@flast.jp>
This commit is contained in:
Kohei Takahashi
2012-10-17 18:05:39 +09:00
parent 1fde7cc293
commit 39785ddb0e
3 changed files with 110 additions and 0 deletions
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1
include/boost/fusion/adapted/boost_tuple.hpp
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@ -17,5 +17,6 @@
#include <boost/fusion/adapted/boost_tuple/detail/size_impl.hpp>
#include <boost/fusion/adapted/boost_tuple/detail/at_impl.hpp>
#include <boost/fusion/adapted/boost_tuple/detail/value_at_impl.hpp>
#include <boost/fusion/adapted/boost_tuple/detail/convert_impl.hpp>
#endif

59
include/boost/fusion/adapted/boost_tuple/detail/build_cons.hpp Normal file
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@ -0,0 +1,59 @@
/*=============================================================================
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_BUILD_CONS_10172012_0130)
#define BOOST_FUSION_BUILD_CONS_10172012_0130
#include <boost/tuple/tuple.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>
namespace boost { namespace fusion { namespace detail
{
template <
typename First
, typename Last
, bool is_empty = result_of::equal_to<First, Last>::value>
struct build_tuple_cons;
template <typename First, typename Last>
struct build_tuple_cons<First, Last, true>
{
typedef boost::tuples::null_type type;
BOOST_FUSION_GPU_ENABLED
static type
call(First const&, Last const&)
{
return type();
}
};
template <typename First, typename Last>
struct build_tuple_cons<First, Last, false>
{
typedef
build_tuple_cons<typename result_of::next<First>::type, Last>
next_build_tuple_cons;
typedef boost::tuples::cons<
typename result_of::value_of<First>::type
, typename next_build_tuple_cons::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 type(v, next_build_tuple_cons::call(fusion::next(f), l));
}
};
}}}
#endif

50
include/boost/fusion/adapted/boost_tuple/detail/convert_impl.hpp Normal file
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@ -0,0 +1,50 @@
/*=============================================================================
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_0120)
#define BOOST_FUSION_CONVERT_IMPL_10172012_0120
#include <boost/tuple/tuple.hpp>
#include <boost/fusion/adapted/boost_tuple/detail/build_cons.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
namespace boost { namespace fusion
{
struct boost_tuple_tag;
namespace extension
{
template <typename T>
struct convert_impl;
template <>
struct convert_impl<boost_tuple_tag>
{
template <typename Sequence>
struct apply
{
typedef typename
detail::build_tuple_cons<
typename result_of::begin<Sequence>::type
, typename result_of::end<Sequence>::type
>
build_tuple_cons;
typedef typename build_tuple_cons::type type;
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& seq)
{
return build_tuple_cons::call(fusion::begin(seq), fusion::end(seq));
}
};
};
}
}}
#endif