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