2 #ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
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3 #define BOOST_MPL_DISTANCE_HPP_INCLUDED
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5 // Copyright Aleksey Gurtovoy 2000-2004
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7 // Distributed under the Boost Software License, Version 1.0.
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8 // (See accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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11 // See http://www.boost.org/libs/mpl for documentation.
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13 // $Id: distance.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
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15 // $Revision: 49267 $
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17 #include <boost/mpl/distance_fwd.hpp>
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18 #include <boost/mpl/iter_fold.hpp>
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19 #include <boost/mpl/iterator_range.hpp>
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20 #include <boost/mpl/long.hpp>
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21 #include <boost/mpl/next.hpp>
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22 #include <boost/mpl/tag.hpp>
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23 #include <boost/mpl/apply_wrap.hpp>
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24 #include <boost/mpl/aux_/msvc_eti_base.hpp>
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25 #include <boost/mpl/aux_/value_wknd.hpp>
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26 #include <boost/mpl/aux_/na_spec.hpp>
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27 #include <boost/mpl/aux_/config/forwarding.hpp>
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28 #include <boost/mpl/aux_/config/static_constant.hpp>
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31 namespace boost { namespace mpl {
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33 // default implementation for forward/bidirectional iterators
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34 template< typename Tag > struct distance_impl
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36 template< typename First, typename Last > struct apply
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37 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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38 : aux::msvc_eti_base< typename iter_fold<
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39 iterator_range<First,Last>
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46 typedef typename iter_fold<
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47 iterator_range<First,Last>
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52 BOOST_STATIC_CONSTANT(long, value =
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54 iterator_range<First,Last>
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64 typename BOOST_MPL_AUX_NA_PARAM(First)
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65 , typename BOOST_MPL_AUX_NA_PARAM(Last)
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68 : distance_impl< typename tag<First>::type >
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69 ::template apply<First, Last>
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71 BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
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74 BOOST_MPL_AUX_NA_SPEC(2, distance)
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78 #endif // BOOST_MPL_DISTANCE_HPP_INCLUDED
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