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1
2 #ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
3 #define BOOST_MPL_DISTANCE_HPP_INCLUDED
4
5 // Copyright Aleksey Gurtovoy 2000-2004
6 //
7 // Distributed under the Boost Software License, Version 1.0. 
8 // (See accompanying file LICENSE_1_0.txt or copy at 
9 // http://www.boost.org/LICENSE_1_0.txt)
10 //
11 // See http://www.boost.org/libs/mpl for documentation.
12
13 // $Id: distance.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $
15 // $Revision: 49267 $
16
17 #include <boost/mpl/distance_fwd.hpp>
18 #include <boost/mpl/iter_fold.hpp>
19 #include <boost/mpl/iterator_range.hpp>
20 #include <boost/mpl/long.hpp>
21 #include <boost/mpl/next.hpp>
22 #include <boost/mpl/tag.hpp>
23 #include <boost/mpl/apply_wrap.hpp>
24 #include <boost/mpl/aux_/msvc_eti_base.hpp>
25 #include <boost/mpl/aux_/value_wknd.hpp>
26 #include <boost/mpl/aux_/na_spec.hpp>
27 #include <boost/mpl/aux_/config/forwarding.hpp>
28 #include <boost/mpl/aux_/config/static_constant.hpp>
29
30
31 namespace boost { namespace mpl {
32
33 // default implementation for forward/bidirectional iterators
34 template< typename Tag > struct distance_impl
35 {
36     template< typename First, typename Last > struct apply
37 #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
38         : aux::msvc_eti_base< typename iter_fold<
39               iterator_range<First,Last>
40             , mpl::long_<0>
41             , next<>
42             >::type >
43     {
44 #else
45     {
46         typedef typename iter_fold<
47               iterator_range<First,Last>
48             , mpl::long_<0>
49             , next<>
50             >::type type;
51         
52         BOOST_STATIC_CONSTANT(long, value =
53               (iter_fold<
54                   iterator_range<First,Last>
55                 , mpl::long_<0>
56                 , next<>
57                 >::type::value)
58             );
59 #endif
60     };
61 };
62
63 template<
64       typename BOOST_MPL_AUX_NA_PARAM(First)
65     , typename BOOST_MPL_AUX_NA_PARAM(Last)
66     >
67 struct distance
68     : distance_impl< typename tag<First>::type >
69         ::template apply<First, Last>
70 {
71     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
72 };
73
74 BOOST_MPL_AUX_NA_SPEC(2, distance)
75
76 }}
77
78 #endif // BOOST_MPL_DISTANCE_HPP_INCLUDED