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/*=============================================================================
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_BEGIN_IMPL_07162005_0115)
#define FUSION_BEGIN_IMPL_07162005_0115
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/iterator/equal_to.hpp>
#include <boost/mpl/if.hpp>
namespace boost { namespace fusion
{
struct joint_view_tag;
template <typename Category, typename First, typename Last, typename Concat>
struct joint_view_iterator;
namespace extension
{
template <typename Tag>
struct begin_impl;
template <>
struct begin_impl<joint_view_tag>
{
template <typename Sequence>
struct apply
{
typedef typename Sequence::first_type first_type;
typedef typename Sequence::last_type last_type;
typedef typename Sequence::concat_type concat_type;
typedef typename Sequence::category category;
typedef result_of::equal_to<first_type, last_type> equal_to;
typedef typename
mpl::if_<
equal_to
, concat_type
, joint_view_iterator<category, first_type, last_type, concat_type>
>::type
type;
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& s, mpl::true_)
{
return s.concat();
}
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& s, mpl::false_)
{
return type(s.first(), s.concat());
}
BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& s)
{
return call(s, equal_to());
}
};
};
}
}}
#endif
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Swift