/*=============================================================================
|
Copyright (c) 2001-2011 Joel de Guzman
|
Copyright (c) 2018 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(FUSION_NEXT_IMPL_06052005_0900)
|
#define FUSION_NEXT_IMPL_06052005_0900
|
|
#include <boost/fusion/support/config.hpp>
|
#include <boost/fusion/iterator/next.hpp>
|
#include <boost/fusion/iterator/equal_to.hpp>
|
#include <boost/mpl/eval_if.hpp>
|
#include <boost/mpl/identity.hpp>
|
|
namespace boost { namespace fusion
|
{
|
struct filter_view_iterator_tag;
|
|
template <typename Category, typename First, typename Last, typename Pred>
|
struct filter_iterator;
|
|
namespace extension
|
{
|
template <typename Tag>
|
struct next_impl;
|
|
template <>
|
struct next_impl<filter_view_iterator_tag>
|
{
|
template <typename Iterator>
|
struct apply
|
{
|
typedef typename Iterator::first_type first_type;
|
typedef typename Iterator::last_type last_type;
|
typedef typename Iterator::pred_type pred_type;
|
typedef typename Iterator::category category;
|
|
typedef typename
|
mpl::eval_if<
|
result_of::equal_to<first_type, last_type>
|
, mpl::identity<last_type>
|
, result_of::next<first_type>
|
>::type
|
next_type;
|
|
typedef filter_iterator<category, next_type, last_type, pred_type> type;
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
static type
|
call(Iterator const& i)
|
{
|
return type(fusion::next(i.first));
|
}
|
};
|
};
|
}
|
}}
|
|
#endif
|
