#ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED | |
#define BOOST_MPL_DISTANCE_HPP_INCLUDED | |
// Copyright Aleksey Gurtovoy 2000-2004 | |
// | |
// Distributed under the Boost Software License, Version 1.0. | |
// (See accompanying file LICENSE_1_0.txt or copy at | |
// http://www.boost.org/LICENSE_1_0.txt) | |
// | |
// See http://www.boost.org/libs/mpl for documentation. | |
// $Id: distance.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ | |
// $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ | |
// $Revision: 49267 $ | |
#include <boost/mpl/distance_fwd.hpp> | |
#include <boost/mpl/iter_fold.hpp> | |
#include <boost/mpl/iterator_range.hpp> | |
#include <boost/mpl/long.hpp> | |
#include <boost/mpl/next.hpp> | |
#include <boost/mpl/tag.hpp> | |
#include <boost/mpl/apply_wrap.hpp> | |
#include <boost/mpl/aux_/msvc_eti_base.hpp> | |
#include <boost/mpl/aux_/value_wknd.hpp> | |
#include <boost/mpl/aux_/na_spec.hpp> | |
#include <boost/mpl/aux_/config/forwarding.hpp> | |
#include <boost/mpl/aux_/config/static_constant.hpp> | |
namespace boost { namespace mpl { | |
// default implementation for forward/bidirectional iterators | |
template< typename Tag > struct distance_impl | |
{ | |
template< typename First, typename Last > struct apply | |
#if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING) | |
: aux::msvc_eti_base< typename iter_fold< | |
iterator_range<First,Last> | |
, mpl::long_<0> | |
, next<> | |
>::type > | |
{ | |
#else | |
{ | |
typedef typename iter_fold< | |
iterator_range<First,Last> | |
, mpl::long_<0> | |
, next<> | |
>::type type; | |
BOOST_STATIC_CONSTANT(long, value = | |
(iter_fold< | |
iterator_range<First,Last> | |
, mpl::long_<0> | |
, next<> | |
>::type::value) | |
); | |
#endif | |
}; | |
}; | |
template< | |
typename BOOST_MPL_AUX_NA_PARAM(First) | |
, typename BOOST_MPL_AUX_NA_PARAM(Last) | |
> | |
struct distance | |
: distance_impl< typename tag<First>::type > | |
::template apply<First, Last> | |
{ | |
BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last)) | |
}; | |
BOOST_MPL_AUX_NA_SPEC(2, distance) | |
}} | |
#endif // BOOST_MPL_DISTANCE_HPP_INCLUDED |