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| 2 | #ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED |
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| 3 | #define BOOST_MPL_DISTANCE_HPP_INCLUDED |
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| 4 | |
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| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
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| 6 | // |
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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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| 10 | // |
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| 11 | // See http://www.boost.org/libs/mpl for documentation. |
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| 12 | |
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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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| 16 | |
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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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| 29 | |
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| 30 | |
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| 31 | namespace boost { namespace mpl { |
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| 32 | |
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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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| 35 | { |
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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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| 40 | , mpl::long_<0> |
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| 41 | , next<> |
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| 42 | >::type > |
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| 43 | { |
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| 44 | #else |
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| 45 | { |
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| 46 | typedef typename iter_fold< |
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| 47 | iterator_range<First,Last> |
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| 48 | , mpl::long_<0> |
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| 49 | , next<> |
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| 50 | >::type type; |
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| 51 | |
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| 52 | BOOST_STATIC_CONSTANT(long, value = |
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| 53 | (iter_fold< |
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| 54 | iterator_range<First,Last> |
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| 55 | , mpl::long_<0> |
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| 56 | , next<> |
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| 57 | >::type::value) |
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| 58 | ); |
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| 59 | #endif |
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| 60 | }; |
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| 61 | }; |
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| 62 | |
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| 63 | template< |
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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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| 66 | > |
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| 67 | struct distance |
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| 68 | : distance_impl< typename tag<First>::type > |
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| 69 | ::template apply<First, Last> |
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| 70 | { |
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| 71 | BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last)) |
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| 72 | }; |
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| 73 | |
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| 74 | BOOST_MPL_AUX_NA_SPEC(2, distance) |
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| 75 | |
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| 76 | }} |
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| 77 | |
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| 78 | #endif // BOOST_MPL_DISTANCE_HPP_INCLUDED |
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