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#ifndef BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
#define BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
// Copyright Aleksey Gurtovoy 2000-2004
//
// 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/next_prior.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/iterator_tags.hpp>
#include <boost/mpl/aux_/lambda_spec.hpp>
#include <boost/mpl/aux_/config/ctps.hpp>
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
# include <boost/type_traits/is_same.hpp>
#endif
namespace boost { namespace mpl {
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
template<
typename Iterator1
, typename LastIterator1
, typename Iterator2
>
struct joint_iter
{
typedef Iterator1 base;
typedef forward_iterator_tag category;
};
template<
typename LastIterator1
, typename Iterator2
>
struct joint_iter<LastIterator1,LastIterator1,Iterator2>
{
typedef Iterator2 base;
typedef forward_iterator_tag category;
};
template< typename I1, typename L1, typename I2 >
struct deref< joint_iter<I1,L1,I2> >
{
typedef typename joint_iter<I1,L1,I2>::base base_;
typedef typename deref<base_>::type type;
};
template< typename I1, typename L1, typename I2 >
struct next< joint_iter<I1,L1,I2> >
{
typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > type;
};
template< typename L1, typename I2 >
struct next< joint_iter<L1,L1,I2> >
{
typedef joint_iter< L1,L1,typename mpl::next<I2>::type > type;
};
#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<
typename Iterator1
, typename LastIterator1
, typename Iterator2
>
struct joint_iter;
template< bool > struct joint_iter_impl
{
template< typename I1, typename L1, typename I2 > struct result_
{
typedef I1 base;
typedef forward_iterator_tag category;
typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > next;
typedef typename deref<I1>::type type;
};
};
template<> struct joint_iter_impl<true>
{
template< typename I1, typename L1, typename I2 > struct result_
{
typedef I2 base;
typedef forward_iterator_tag category;
typedef joint_iter< L1,L1,typename mpl::next<I2>::type > next;
typedef typename deref<I2>::type type;
};
};
template<
typename Iterator1
, typename LastIterator1
, typename Iterator2
>
struct joint_iter
: joint_iter_impl< is_same<Iterator1,LastIterator1>::value >
::template result_<Iterator1,LastIterator1,Iterator2>
{
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, joint_iter)
}}
#endif // BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
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