74 lines
1.5 KiB
C++
74 lines
1.5 KiB
C++
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#ifndef BOOST_MPL_AUX_SINGLE_ELEMENT_ITER_HPP_INCLUDED
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#define BOOST_MPL_AUX_SINGLE_ELEMENT_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/iterator_tags.hpp>
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#include <boost/mpl/advance_fwd.hpp>
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#include <boost/mpl/distance_fwd.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/int.hpp>
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#include <boost/mpl/aux_/value_wknd.hpp>
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#include <boost/mpl/aux_/config/ctps.hpp>
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namespace boost { namespace mpl {
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namespace aux {
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template< typename T, int is_last_ >
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struct sel_iter;
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template< typename T >
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struct sel_iter<T,0>
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{
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typedef random_access_iterator_tag category;
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typedef sel_iter<T,1> next;
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typedef T type;
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};
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template< typename T >
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struct sel_iter<T,1>
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{
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typedef random_access_iterator_tag category;
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typedef sel_iter<T,0> prior;
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};
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} // namespace aux
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template< typename T, int is_last_, typename Distance >
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struct advance< aux::sel_iter<T,is_last_>,Distance>
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{
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typedef aux::sel_iter<
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T
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, ( is_last_ + BOOST_MPL_AUX_NESTED_VALUE_WKND(int, Distance) )
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> type;
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};
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template<
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typename T
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, int l1
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, int l2
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>
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struct distance< aux::sel_iter<T,l1>, aux::sel_iter<T,l2> >
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: int_<( l2 - l1 )>
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{
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};
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}}
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#endif // BOOST_MPL_AUX_SINGLE_ELEMENT_ITER_HPP_INCLUDED
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