170 lines
4.4 KiB
C++
170 lines
4.4 KiB
C++
|
|
#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: 2008-10-10 23:19:02 -0700 (Fri, 10 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
|