sl@0: 
sl@0: #ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
sl@0: #define BOOST_MPL_DISTANCE_HPP_INCLUDED
sl@0: 
sl@0: // Copyright Aleksey Gurtovoy 2000-2004
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. 
sl@0: // (See accompanying file LICENSE_1_0.txt or copy at 
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //
sl@0: // See http://www.boost.org/libs/mpl for documentation.
sl@0: 
sl@0: // $Source: /cvsroot/boost/boost/boost/mpl/distance.hpp,v $
sl@0: // $Date: 2005/01/26 01:58:33 $
sl@0: // $Revision: 1.10 $
sl@0: 
sl@0: #include <boost/mpl/distance_fwd.hpp>
sl@0: #include <boost/mpl/iter_fold.hpp>
sl@0: #include <boost/mpl/iterator_range.hpp>
sl@0: #include <boost/mpl/long.hpp>
sl@0: #include <boost/mpl/next.hpp>
sl@0: #include <boost/mpl/tag.hpp>
sl@0: #include <boost/mpl/apply_wrap.hpp>
sl@0: #include <boost/mpl/aux_/msvc_eti_base.hpp>
sl@0: #include <boost/mpl/aux_/value_wknd.hpp>
sl@0: #include <boost/mpl/aux_/na_spec.hpp>
sl@0: #include <boost/mpl/aux_/config/forwarding.hpp>
sl@0: #include <boost/mpl/aux_/config/static_constant.hpp>
sl@0: 
sl@0: 
sl@0: namespace boost { namespace mpl {
sl@0: 
sl@0: // default implementation for forward/bidirectional iterators
sl@0: template< typename Tag > struct distance_impl
sl@0: {
sl@0:     template< typename First, typename Last > struct apply
sl@0: #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
sl@0:         : aux::msvc_eti_base< typename iter_fold<
sl@0:               iterator_range<First,Last>
sl@0:             , mpl::long_<0>
sl@0:             , next<>
sl@0:             >::type >
sl@0:     {
sl@0: #else
sl@0:     {
sl@0:         typedef typename iter_fold<
sl@0:               iterator_range<First,Last>
sl@0:             , mpl::long_<0>
sl@0:             , next<>
sl@0:             >::type type;
sl@0:         
sl@0:         BOOST_STATIC_CONSTANT(long, value =
sl@0:               (iter_fold<
sl@0:                   iterator_range<First,Last>
sl@0:                 , mpl::long_<0>
sl@0:                 , next<>
sl@0:                 >::type::value)
sl@0:             );
sl@0: #endif
sl@0:     };
sl@0: };
sl@0: 
sl@0: template<
sl@0:       typename BOOST_MPL_AUX_NA_PARAM(First)
sl@0:     , typename BOOST_MPL_AUX_NA_PARAM(Last)
sl@0:     >
sl@0: struct distance
sl@0:     : distance_impl< typename tag<First>::type >
sl@0:         ::template apply<First, Last>
sl@0: {
sl@0:     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
sl@0: };
sl@0: 
sl@0: BOOST_MPL_AUX_NA_SPEC(2, distance)
sl@0: 
sl@0: }}
sl@0: 
sl@0: #endif // BOOST_MPL_DISTANCE_HPP_INCLUDED