Chris@16: 
Chris@16: #ifndef BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
Chris@16: #define BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED
Chris@16: 
Chris@16: // Copyright Aleksey Gurtovoy 2000-2004
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. 
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at 
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/mpl for documentation.
Chris@16: 
Chris@101: // $Id$
Chris@101: // $Date$
Chris@101: // $Revision$
Chris@16: 
Chris@16: #include <boost/mpl/next_prior.hpp>
Chris@16: #include <boost/mpl/deref.hpp>
Chris@16: #include <boost/mpl/iterator_tags.hpp>
Chris@16: #include <boost/mpl/aux_/lambda_spec.hpp>
Chris@16: #include <boost/mpl/aux_/config/ctps.hpp>
Chris@16: 
Chris@16: #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
Chris@16: #   include <boost/type_traits/is_same.hpp>
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost { namespace mpl {
Chris@16: 
Chris@16: #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
Chris@16: 
Chris@16: template<
Chris@16:       typename Iterator1
Chris@16:     , typename LastIterator1
Chris@16:     , typename Iterator2
Chris@16:     >
Chris@16: struct joint_iter
Chris@16: {
Chris@16:     typedef Iterator1 base;
Chris@16:     typedef forward_iterator_tag category;
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       typename LastIterator1
Chris@16:     , typename Iterator2
Chris@16:     >
Chris@16: struct joint_iter<LastIterator1,LastIterator1,Iterator2>
Chris@16: {
Chris@16:     typedef Iterator2 base;
Chris@16:     typedef forward_iterator_tag category;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template< typename I1, typename L1, typename I2 >
Chris@16: struct deref< joint_iter<I1,L1,I2> >
Chris@16: {
Chris@16:     typedef typename joint_iter<I1,L1,I2>::base base_;
Chris@16:     typedef typename deref<base_>::type type;
Chris@16: };
Chris@16: 
Chris@16: template< typename I1, typename L1, typename I2 >
Chris@16: struct next< joint_iter<I1,L1,I2> >
Chris@16: {
Chris@16:     typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > type;
Chris@16: };
Chris@16: 
Chris@16: template< typename L1, typename I2 >
Chris@16: struct next< joint_iter<L1,L1,I2> >
Chris@16: {
Chris@16:     typedef joint_iter< L1,L1,typename mpl::next<I2>::type > type;
Chris@16: };
Chris@16: 
Chris@16: #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: 
Chris@16: template<
Chris@16:       typename Iterator1
Chris@16:     , typename LastIterator1
Chris@16:     , typename Iterator2
Chris@16:     >
Chris@16: struct joint_iter;
Chris@16: 
Chris@16: template< bool > struct joint_iter_impl
Chris@16: {
Chris@16:     template< typename I1, typename L1, typename I2 > struct result_
Chris@16:     {
Chris@16:         typedef I1 base;
Chris@16:         typedef forward_iterator_tag category;
Chris@16:         typedef joint_iter< typename mpl::next<I1>::type,L1,I2 > next;
Chris@16:         typedef typename deref<I1>::type type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template<> struct joint_iter_impl<true>
Chris@16: {
Chris@16:     template< typename I1, typename L1, typename I2 > struct result_
Chris@16:     {
Chris@16:         typedef I2 base;
Chris@16:         typedef forward_iterator_tag category;
Chris@16:         typedef joint_iter< L1,L1,typename mpl::next<I2>::type > next;
Chris@16:         typedef typename deref<I2>::type type;
Chris@16:     };
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       typename Iterator1
Chris@16:     , typename LastIterator1
Chris@16:     , typename Iterator2
Chris@16:     >
Chris@16: struct joint_iter
Chris@16:     : joint_iter_impl< is_same<Iterator1,LastIterator1>::value >
Chris@16:         ::template result_<Iterator1,LastIterator1,Iterator2>
Chris@16: {
Chris@16: };
Chris@16: 
Chris@16: #endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
Chris@16: 
Chris@16: BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(3, joint_iter)
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif // BOOST_MPL_AUX_JOINT_ITER_HPP_INCLUDED