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79 lines
2.0 KiB
C++
79 lines
2.0 KiB
C++
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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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// $Id$
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// $Date$
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// $Revision$
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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
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