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118 lines
2.8 KiB
118 lines
2.8 KiB
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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: single_element_iter.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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// $Revision: 49267 $ |
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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_/nttp_decl.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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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
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namespace aux { |
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template< typename T, BOOST_MPL_AUX_NTTP_DECL(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, BOOST_MPL_AUX_NTTP_DECL(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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, BOOST_MPL_AUX_NTTP_DECL(int, l1) |
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, BOOST_MPL_AUX_NTTP_DECL(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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#else |
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namespace aux { |
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struct sel_iter_tag; |
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template< typename T, BOOST_MPL_AUX_NTTP_DECL(int, is_last_) > |
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struct sel_iter |
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{ |
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enum { pos_ = is_last_ }; |
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typedef aux::sel_iter_tag tag; |
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typedef random_access_iterator_tag category; |
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typedef sel_iter<T,(is_last_ + 1)> next; |
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typedef sel_iter<T,(is_last_ - 1)> prior; |
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typedef T type; |
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}; |
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} // namespace aux |
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template<> struct advance_impl<aux::sel_iter_tag> |
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{ |
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template< typename Iterator, typename N > struct apply |
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{ |
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enum { pos_ = Iterator::pos_, n_ = N::value }; |
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typedef aux::sel_iter< |
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typename Iterator::type |
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, (pos_ + n_) |
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> type; |
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}; |
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}; |
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template<> struct distance_impl<aux::sel_iter_tag> |
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{ |
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template< typename Iter1, typename Iter2 > struct apply |
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{ |
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enum { pos1_ = Iter1::pos_, pos2_ = Iter2::pos_ }; |
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typedef int_<( pos2_ - pos1_ )> type; |
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BOOST_STATIC_CONSTANT(int, value = ( pos2_ - pos1_ )); |
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}; |
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}; |
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#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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}} |
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#endif // BOOST_MPL_AUX_SINGLE_ELEMENT_ITER_HPP_INCLUDED
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