sl@0: 
sl@0: #ifndef BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
sl@0: #define BOOST_MPL_PAIR_VIEW_HPP_INCLUDED
sl@0: 
sl@0: // Copyright David Abrahams 2003-2004
sl@0: // Copyright Aleksey Gurtovoy 2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/pair_view.hpp,v $
sl@0: // $Date: 2004/11/28 01:56:21 $
sl@0: // $Revision: 1.5 $
sl@0: 
sl@0: #include <boost/mpl/begin_end.hpp>
sl@0: #include <boost/mpl/iterator_category.hpp>
sl@0: #include <boost/mpl/advance.hpp>
sl@0: #include <boost/mpl/distance.hpp>
sl@0: #include <boost/mpl/next_prior.hpp>
sl@0: #include <boost/mpl/deref.hpp>
sl@0: #include <boost/mpl/min_max.hpp>
sl@0: #include <boost/mpl/pair.hpp>
sl@0: #include <boost/mpl/iterator_tags.hpp>
sl@0: #include <boost/mpl/aux_/config/ctps.hpp>
sl@0: #include <boost/mpl/aux_/na_spec.hpp>
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: namespace aux {
sl@0: struct pair_iter_tag;
sl@0: 
sl@0: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0: 
sl@0: template< typename Iter1, typename Iter2, typename Category >
sl@0: struct pair_iter;
sl@0: 
sl@0: template< typename Category > struct prior_pair_iter
sl@0: {
sl@0:     template< typename Iter1, typename Iter2 > struct apply
sl@0:     {
sl@0:         typedef typename mpl::prior<Iter1>::type i1_;
sl@0:         typedef typename mpl::prior<Iter2>::type i2_;
sl@0:         typedef pair_iter<i1_,i2_,Category> type;
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<> struct prior_pair_iter<forward_iterator_tag>
sl@0: {
sl@0:     template< typename Iter1, typename Iter2 > struct apply
sl@0:     {
sl@0:         typedef pair_iter<Iter1,Iter2,forward_iterator_tag> type;
sl@0:     };
sl@0: };
sl@0: 
sl@0: #endif
sl@0: }
sl@0: 
sl@0: template< 
sl@0:       typename Iter1
sl@0:     , typename Iter2
sl@0:     , typename Category
sl@0:     >
sl@0: struct pair_iter
sl@0: {
sl@0:     typedef aux::pair_iter_tag tag;
sl@0:     typedef Category category;
sl@0:     typedef Iter1 first;
sl@0:     typedef Iter2 second;
sl@0:     
sl@0: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0:     typedef pair< 
sl@0:           typename deref<Iter1>::type
sl@0:         , typename deref<Iter2>::type
sl@0:         > type;
sl@0: 
sl@0:     typedef typename mpl::next<Iter1>::type i1_;
sl@0:     typedef typename mpl::next<Iter2>::type i2_;
sl@0:     typedef pair_iter<i1_,i2_,Category> next;
sl@0:     
sl@0:     typedef apply_wrap2< aux::prior_pair_iter<Category>,Iter1,Iter2 >::type prior;
sl@0: #endif
sl@0: };
sl@0: 
sl@0: 
sl@0: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
sl@0: 
sl@0: template< typename Iter1, typename Iter2, typename C >
sl@0: struct deref< pair_iter<Iter1,Iter2,C> >
sl@0: {
sl@0:     typedef pair< 
sl@0:           typename deref<Iter1>::type
sl@0:         , typename deref<Iter2>::type
sl@0:         > type;
sl@0: };
sl@0: 
sl@0: template< typename Iter1, typename Iter2, typename C >
sl@0: struct next< pair_iter<Iter1,Iter2,C> >
sl@0: {
sl@0:     typedef typename mpl::next<Iter1>::type i1_;
sl@0:     typedef typename mpl::next<Iter2>::type i2_;
sl@0:     typedef pair_iter<i1_,i2_,C> type;
sl@0: };
sl@0: 
sl@0: template< typename Iter1, typename Iter2, typename C >
sl@0: struct prior< pair_iter<Iter1,Iter2,C> >
sl@0: {
sl@0:     typedef typename mpl::prior<Iter1>::type i1_;
sl@0:     typedef typename mpl::prior<Iter2>::type i2_;
sl@0:     typedef pair_iter<i1_,i2_,C> type;
sl@0: };
sl@0: 
sl@0: #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
sl@0: 
sl@0: 
sl@0: template<> struct advance_impl<aux::pair_iter_tag>
sl@0: {
sl@0:     template< typename Iter, typename D > struct apply
sl@0:     {
sl@0:         typedef typename mpl::advance< typename Iter::first,D >::type i1_;
sl@0:         typedef typename mpl::advance< typename Iter::second,D >::type i2_;
sl@0:         typedef pair_iter<i1_,i2_,typename Iter::category> type;
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<> struct distance_impl<aux::pair_iter_tag>
sl@0: {
sl@0:     template< typename Iter1, typename Iter2 > struct apply
sl@0:     {
sl@0:         // agurt, 10/nov/04: MSVC 6.5 ICE-s on forwarding
sl@0:         typedef typename mpl::distance<
sl@0:               typename first<Iter1>::type
sl@0:             , typename first<Iter2>::type
sl@0:             >::type type;
sl@0:     };
sl@0: };
sl@0: 
sl@0: 
sl@0: template<
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(Sequence1)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(Sequence2)
sl@0:     >
sl@0: struct pair_view
sl@0: {
sl@0:     typedef nested_begin_end_tag tag;
sl@0: 
sl@0:     typedef typename begin<Sequence1>::type iter1_;
sl@0:     typedef typename begin<Sequence2>::type iter2_;
sl@0:     typedef typename min<
sl@0:           typename iterator_category<iter1_>::type
sl@0:         , typename iterator_category<iter2_>::type
sl@0:         >::type category_;
sl@0:     
sl@0:     typedef pair_iter<iter1_,iter2_,category_> begin;
sl@0:     
sl@0:     typedef pair_iter<
sl@0:           typename end<Sequence1>::type
sl@0:         , typename end<Sequence2>::type
sl@0:         , category_
sl@0:         > end;
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(2, pair_view)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_PAIR_VIEW_HPP_INCLUDED