| [12] | 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 | // $Source: /cvsroot/boost/boost/boost/mpl/distance.hpp,v $ |
|---|
| 14 | // $Date: 2005/01/26 01:58:33 $ |
|---|
| 15 | // $Revision: 1.10 $ |
|---|
| 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 |
|---|
