/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
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) | |
==============================================================================*/ | |
#if !defined(FUSION_MPL_ITERATOR_05052005_0731) | |
#define FUSION_MPL_ITERATOR_05052005_0731 | |
#include <boost/fusion/support/detail/mpl_iterator_category.hpp> | |
#include <boost/fusion/iterator/iterator_facade.hpp> | |
#include <boost/type_traits/remove_const.hpp> | |
#include <boost/mpl/deref.hpp> | |
#include <boost/mpl/next.hpp> | |
#include <boost/mpl/prior.hpp> | |
#include <boost/mpl/advance.hpp> | |
#include <boost/mpl/distance.hpp> | |
namespace boost { namespace fusion | |
{ | |
template <typename Iterator_> | |
struct mpl_iterator | |
: iterator_facade< | |
mpl_iterator<Iterator_> | |
, typename detail::mpl_iterator_category<typename Iterator_::category>::type | |
> | |
{ | |
typedef typename remove_const<Iterator_>::type iterator_type; | |
template <typename Iterator> | |
struct value_of : mpl::deref<typename Iterator::iterator_type> {}; | |
template <typename Iterator> | |
struct deref | |
{ | |
typedef typename mpl::deref< | |
typename Iterator::iterator_type>::type | |
type; | |
static type | |
call(Iterator) | |
{ | |
return type(); | |
} | |
}; | |
template <typename Iterator> | |
struct next | |
{ | |
typedef mpl_iterator< | |
typename mpl::next<typename Iterator::iterator_type>::type> | |
type; | |
static type | |
call(Iterator) | |
{ | |
return type(); | |
} | |
}; | |
template <typename Iterator> | |
struct prior | |
{ | |
typedef mpl_iterator< | |
typename mpl::prior<typename Iterator::iterator_type>::type> | |
type; | |
static type | |
call(Iterator) | |
{ | |
return type(); | |
} | |
}; | |
template <typename Iterator, typename N> | |
struct advance | |
{ | |
typedef mpl_iterator< | |
typename mpl::advance<typename Iterator::iterator_type, N>::type> | |
type; | |
static type | |
call(Iterator const& /*i*/) | |
{ | |
return type(); | |
} | |
}; | |
template <typename I1, typename I2> | |
struct distance : | |
mpl::distance< | |
typename I1::iterator_type | |
, typename I2::iterator_type> | |
{ | |
typedef typename | |
mpl::distance< | |
typename I1::iterator_type | |
, typename I2::iterator_type | |
>::type | |
type; | |
static type | |
call(I1 const&, I2 const&) | |
{ | |
return type(); | |
} | |
}; | |
}; | |
}} | |
#endif | |