boost/fusion/algorithm/iteration/detail/for_each.hpp
/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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(FUSION_FOR_EACH_05052005_1028)
#define FUSION_FOR_EACH_05052005_1028
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/iterator/equal_to.hpp>
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <boost/fusion/iterator/distance.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/mpl/bool.hpp>
namespace boost { namespace fusion {
namespace detail
{
template <typename First, typename Last, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline void
for_each_linear(First const&, Last const&, F const&, mpl::true_)
{
}
template <typename First, typename Last, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline void
for_each_linear(First const& first, Last const& last, F& f, mpl::false_)
{
f(*first);
detail::for_each_linear(fusion::next(first), last, f,
result_of::equal_to<typename result_of::next<First>::type, Last>());
}
template <typename Sequence, typename F, typename Tag>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline void
for_each_dispatch(Sequence& seq, F& f, Tag)
{
detail::for_each_linear(
fusion::begin(seq)
, fusion::end(seq)
, f
, result_of::equal_to<
typename result_of::begin<Sequence>::type
, typename result_of::end<Sequence>::type>());
}
template<int N>
struct for_each_unrolled
{
template<typename I0, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static void call(I0 const& i0, F& f)
{
f(*i0);
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
f(*i1);
typedef typename result_of::next<I1>::type I2;
I2 i2(fusion::next(i1));
f(*i2);
typedef typename result_of::next<I2>::type I3;
I3 i3(fusion::next(i2));
f(*i3);
for_each_unrolled<N-4>::call(fusion::next(i3), f);
}
};
template<>
struct for_each_unrolled<3>
{
template<typename I0, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static void call(I0 const& i0, F& f)
{
f(*i0);
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
f(*i1);
typedef typename result_of::next<I1>::type I2;
I2 i2(fusion::next(i1));
f(*i2);
}
};
template<>
struct for_each_unrolled<2>
{
template<typename I0, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static void call(I0 const& i0, F& f)
{
f(*i0);
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
f(*i1);
}
};
template<>
struct for_each_unrolled<1>
{
template<typename I0, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static void call(I0 const& i0, F& f)
{
f(*i0);
}
};
template<>
struct for_each_unrolled<0>
{
template<typename It, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static void call(It const&, F const&)
{
}
};
template <typename Sequence, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline void
for_each_dispatch(Sequence& seq, F& f, random_access_traversal_tag)
{
typedef typename result_of::begin<Sequence>::type begin;
typedef typename result_of::end<Sequence>::type end;
for_each_unrolled<result_of::distance<begin, end>::type::value>::call(fusion::begin(seq), f);
}
template <typename Sequence, typename F>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
inline void
for_each(Sequence& seq, F& f, mpl::false_) // unsegmented implementation
{
detail::for_each_dispatch(seq, f, typename traits::category_of<Sequence>::type());
}
}}}
#endif
