| |
| #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: pair_view.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
| // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
| // $Revision: 49267 $ |
| |
| #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 |