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