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78 lines
2.1 KiB
78 lines
2.1 KiB
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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
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