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#ifndef BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
#define BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
// Copyright David Abrahams 2003-2004
// Copyright Aleksey Gurtovoy 2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.
// $Id$
// $Date$
// $Revision$
#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/iterator_category.hpp>
#include <boost/mpl/advance.hpp>
#include <boost/mpl/distance.hpp>
#include <boost/mpl/next_prior.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/min_max.hpp>
#include <boost/mpl/pair.hpp>
#include <boost/mpl/iterator_tags.hpp>
#include <boost/mpl/aux_/config/ctps.hpp>
#include <boost/mpl/aux_/na_spec.hpp>
namespace boost { namespace mpl {
namespace aux {
struct pair_iter_tag;
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template< typename Iter1, typename Iter2, typename Category >
struct pair_iter;
template< typename Category > struct prior_pair_iter
{
template< typename Iter1, typename Iter2 > struct apply
{
typedef typename mpl::prior<Iter1>::type i1_;
typedef typename mpl::prior<Iter2>::type i2_;
typedef pair_iter<i1_,i2_,Category> type;
};
};
template<> struct prior_pair_iter<forward_iterator_tag>
{
template< typename Iter1, typename Iter2 > struct apply
{
typedef pair_iter<Iter1,Iter2,forward_iterator_tag> type;
};
};
#endif
}
template<
typename Iter1
, typename Iter2
, typename Category
>
struct pair_iter
{
typedef aux::pair_iter_tag tag;
typedef Category category;
typedef Iter1 first;
typedef Iter2 second;
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
typedef pair<
typename deref<Iter1>::type
, typename deref<Iter2>::type
> type;
typedef typename mpl::next<Iter1>::type i1_;
typedef typename mpl::next<Iter2>::type i2_;
typedef pair_iter<i1_,i2_,Category> next;
typedef apply_wrap2< aux::prior_pair_iter<Category>,Iter1,Iter2 >::type prior;
#endif
};
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template< typename Iter1, typename Iter2, typename C >
struct deref< pair_iter<Iter1,Iter2,C> >
{
typedef pair<
typename deref<Iter1>::type
, typename deref<Iter2>::type
> type;
};
template< typename Iter1, typename Iter2, typename C >
struct next< pair_iter<Iter1,Iter2,C> >
{
typedef typename mpl::next<Iter1>::type i1_;
typedef typename mpl::next<Iter2>::type i2_;
typedef pair_iter<i1_,i2_,C> type;
};
template< typename Iter1, typename Iter2, typename C >
struct prior< pair_iter<Iter1,Iter2,C> >
{
typedef typename mpl::prior<Iter1>::type i1_;
typedef typename mpl::prior<Iter2>::type i2_;
typedef pair_iter<i1_,i2_,C> type;
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<> struct advance_impl<aux::pair_iter_tag>
{
template< typename Iter, typename D > struct apply
{
typedef typename mpl::advance< typename Iter::first,D >::type i1_;
typedef typename mpl::advance< typename Iter::second,D >::type i2_;
typedef pair_iter<i1_,i2_,typename Iter::category> type;
};
};
template<> struct distance_impl<aux::pair_iter_tag>
{
template< typename Iter1, typename Iter2 > struct apply
{
// agurt, 10/nov/04: MSVC 6.5 ICE-s on forwarding
typedef typename mpl::distance<
typename first<Iter1>::type
, typename first<Iter2>::type
>::type type;
};
};
template<
typename BOOST_MPL_AUX_NA_PARAM(Sequence1)
, typename BOOST_MPL_AUX_NA_PARAM(Sequence2)
>
struct pair_view
{
typedef nested_begin_end_tag tag;
typedef typename begin<Sequence1>::type iter1_;
typedef typename begin<Sequence2>::type iter2_;
typedef typename min<
typename iterator_category<iter1_>::type
, typename iterator_category<iter2_>::type
>::type category_;
typedef pair_iter<iter1_,iter2_,category_> begin;
typedef pair_iter<
typename end<Sequence1>::type
, typename end<Sequence2>::type
, category_
> end;
};
BOOST_MPL_AUX_NA_SPEC(2, pair_view)
}}
#endif // BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
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