imgtools/imglib/boostlibrary/boost/mpl/distance.hpp
author Richard Taylor <richard.i.taylor@nokia.com>
Thu, 03 Dec 2009 14:59:48 +0000
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#ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
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#define BOOST_MPL_DISTANCE_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: distance.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/distance_fwd.hpp>
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#include <boost/mpl/iter_fold.hpp>
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#include <boost/mpl/iterator_range.hpp>
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#include <boost/mpl/long.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/tag.hpp>
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#include <boost/mpl/apply_wrap.hpp>
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#include <boost/mpl/aux_/msvc_eti_base.hpp>
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#include <boost/mpl/aux_/value_wknd.hpp>
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#include <boost/mpl/aux_/na_spec.hpp>
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#include <boost/mpl/aux_/config/forwarding.hpp>
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#include <boost/mpl/aux_/config/static_constant.hpp>
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namespace boost { namespace mpl {
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// default implementation for forward/bidirectional iterators
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template< typename Tag > struct distance_impl
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{
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    template< typename First, typename Last > struct apply
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#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
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        : aux::msvc_eti_base< typename iter_fold<
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              iterator_range<First,Last>
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            , mpl::long_<0>
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            , next<>
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            >::type >
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    {
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#else
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    {
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        typedef typename iter_fold<
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              iterator_range<First,Last>
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            , mpl::long_<0>
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            , next<>
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            >::type type;
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        BOOST_STATIC_CONSTANT(long, value =
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              (iter_fold<
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                  iterator_range<First,Last>
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                , mpl::long_<0>
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                , next<>
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                >::type::value)
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            );
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#endif
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    };
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};
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template<
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      typename BOOST_MPL_AUX_NA_PARAM(First)
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    , typename BOOST_MPL_AUX_NA_PARAM(Last)
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    >
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struct distance
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    : distance_impl< typename tag<First>::type >
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        ::template apply<First, Last>
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{
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    BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
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};
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BOOST_MPL_AUX_NA_SPEC(2, distance)
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}}
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#endif // BOOST_MPL_DISTANCE_HPP_INCLUDED