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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2007 Dan Marsden
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_COUNT_IF_09162005_0141)
#define BOOST_FUSION_COUNT_IF_09162005_0141
#include <boost/fusion/support/config.hpp>
#include <boost/mpl/bool.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/equal_to.hpp>
#include <boost/fusion/iterator/distance.hpp>
#include <boost/fusion/iterator/advance.hpp>
namespace boost { namespace fusion {
struct random_access_traversal_tag;
namespace detail
{
template <typename First, typename Last, typename F>
BOOST_FUSION_GPU_ENABLED
inline int
linear_count_if(First const&, Last const&, F const&, mpl::true_)
{
return 0;
}
template <typename First, typename Last, typename F>
BOOST_FUSION_GPU_ENABLED
inline int
linear_count_if(First const& first, Last const& last, F& f, mpl::false_)
{
int n =
detail::linear_count_if(
fusion::next(first)
, last
, f
, result_of::equal_to<typename result_of::next<First>::type, Last>());
if (f(*first))
++n;
return n;
}
template <typename Sequence, typename F, typename Tag>
BOOST_FUSION_GPU_ENABLED
inline int
count_if(Sequence const& seq, F f, Tag)
{
return detail::linear_count_if(
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 unrolled_count_if
{
template<typename I0, typename F>
BOOST_FUSION_GPU_ENABLED
static int call(I0 const& i0, F f)
{
int ct = unrolled_count_if<n-4>::
call(fusion::advance_c<4>(i0), f);
if(f(*i0))
++ct;
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
if(f(*i1))
++ct;
typedef typename result_of::next<I1>::type I2;
I2 i2(fusion::next(i1));
if(f(*i2))
++ct;
typedef typename result_of::next<I2>::type I3;
I3 i3(fusion::next(i2));
if(f(*i3))
++ct;
return ct;
}
};
template<>
struct unrolled_count_if<3>
{
template<typename I0, typename F>
BOOST_FUSION_GPU_ENABLED
static int call(I0 const& i0, F f)
{
int ct = 0;
if(f(*i0))
++ct;
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
if(f(*i1))
++ct;
typedef typename result_of::next<I1>::type I2;
I2 i2(fusion::next(i1));
if(f(*i2))
++ct;
return ct;
}
};
template<>
struct unrolled_count_if<2>
{
template<typename I0, typename F>
BOOST_FUSION_GPU_ENABLED
static int call(I0 const& i0, F f)
{
int ct = 0;
if(f(*i0))
++ct;
typedef typename result_of::next<I0>::type I1;
I1 i1(fusion::next(i0));
if(f(*i1))
++ct;
return ct;
}
};
template<>
struct unrolled_count_if<1>
{
template<typename I0, typename F>
BOOST_FUSION_GPU_ENABLED
static int call(I0 const& i0, F f)
{
int ct = 0;
if(f(*i0))
++ct;
return ct;
}
};
template<>
struct unrolled_count_if<0>
{
template<typename I0, typename F>
BOOST_FUSION_GPU_ENABLED
static int call(I0 const&, F)
{
return 0;
}
};
template <typename Sequence, typename F>
BOOST_FUSION_GPU_ENABLED
inline int
count_if(Sequence const& seq, F f, random_access_traversal_tag)
{
typedef typename result_of::begin<Sequence>::type begin;
typedef typename result_of::end<Sequence>::type end;
return detail::unrolled_count_if<result_of::distance<begin, end>::type::value>::
call(fusion::begin(seq), f);
}
}}}
#endif
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