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