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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 | // $Id$ | |
14 | // $Date$ | |
15 | // $Revision$ | |
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 |