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/*=============================================================================
Copyright (c) 2009 Christopher Schmidt
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)
==============================================================================*/
#ifndef BOOST_FUSION_ITERATOR_BASIC_ITERATOR_HPP
#define BOOST_FUSION_ITERATOR_BASIC_ITERATOR_HPP
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/iterator/iterator_facade.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/equal_to.hpp>
#include <boost/mpl/minus.hpp>
#include <boost/mpl/int.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/type_traits/remove_const.hpp>
namespace boost { namespace fusion
{
namespace extension
{
template <typename>
struct value_of_impl;
template <typename>
struct deref_impl;
template <typename>
struct value_of_data_impl;
template <typename>
struct key_of_impl;
template <typename>
struct deref_data_impl;
}
template<typename Tag, typename Category, typename Seq, int Index>
struct basic_iterator
: iterator_facade<basic_iterator<Tag, Category, Seq, Index>, Category>
{
typedef mpl::int_<Index> index;
typedef Seq seq_type;
template <typename It>
struct value_of
: extension::value_of_impl<Tag>::template apply<It>
{};
template <typename It>
struct deref
: extension::deref_impl<Tag>::template apply<It>
{};
template <typename It>
struct value_of_data
: extension::value_of_data_impl<Tag>::template apply<It>
{};
template <typename It>
struct key_of
: extension::key_of_impl<Tag>::template apply<It>
{};
template <typename It>
struct deref_data
: extension::deref_data_impl<Tag>::template apply<It>
{};
template <typename It, typename N>
struct advance
{
typedef
basic_iterator<Tag, Category, Seq, Index + N::value>
type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(It const& it)
{
return type(*it.seq,0);
}
};
template <typename It>
struct next
: advance<It, mpl::int_<1> >
{};
template <typename It>
struct prior
: advance<It, mpl::int_<-1> >
{};
template <typename It1, typename It2>
struct distance
{
typedef mpl::minus<typename It2::index, typename It1::index> type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static
type
call(It1 const&, It2 const&)
{
return type();
}
};
template <typename It1, typename It2>
struct equal_to
: mpl::and_<
is_same<
typename remove_const<typename It1::seq_type>::type
, typename remove_const<typename It2::seq_type>::type
>
, mpl::equal_to<typename It1::index,typename It2::index>
>
{};
template<typename OtherSeq>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
basic_iterator(basic_iterator<Tag,Category,OtherSeq,Index> const& it)
: seq(it.seq)
{}
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
basic_iterator(Seq& in_seq, int)
: seq(&in_seq)
{}
template<typename OtherSeq>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
basic_iterator&
operator=(basic_iterator<Tag,Category,OtherSeq,Index> const& it)
{
seq=it.seq;
return *this;
}
Seq* seq;
};
}}
#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
namespace std
{
template <typename Tag, typename Category, typename Seq, int Index>
struct iterator_traits< ::boost::fusion::basic_iterator<Tag, Category, Seq, Index> >
{ };
}
#endif
#endif
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