/*============================================================================= | |
Copyright (c) 2001-2006 Joel de Guzman | |
Copyright (c) 2005-2006 Dan Marsden | |
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(BOOST_FUSION_ARRAY_ITERATOR_26122005_2250) | |
#define BOOST_FUSION_ARRAY_ITERATOR_26122005_2250 | |
#include <cstddef> | |
#include <boost/config.hpp> | |
#include <boost/mpl/int.hpp> | |
#include <boost/mpl/assert.hpp> | |
#include <boost/mpl/if.hpp> | |
#include <boost/mpl/minus.hpp> | |
#include <boost/type_traits/is_const.hpp> | |
#include <boost/fusion/iterator/iterator_facade.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct random_access_traversal_tag; | |
template <typename Array, int Pos> | |
struct array_iterator | |
: iterator_facade<array_iterator<Array, Pos>, random_access_traversal_tag> | |
{ | |
BOOST_MPL_ASSERT_RELATION(Pos, >=, 0); | |
BOOST_MPL_ASSERT_RELATION(Pos, <=, static_cast<int>(Array::static_size)); | |
typedef mpl::int_<Pos> index; | |
typedef Array array_type; | |
array_iterator(Array& a) | |
: array(a) {} | |
Array& array; | |
template <typename Iterator> | |
struct value_of | |
{ | |
typedef typename Iterator::array_type array_type; | |
typedef typename array_type::value_type type; | |
}; | |
template <typename Iterator> | |
struct deref | |
{ | |
typedef typename Iterator::array_type array_type; | |
typedef typename | |
mpl::if_< | |
is_const<array_type> | |
, typename array_type::const_reference | |
, typename array_type::reference | |
>::type | |
type; | |
static type | |
call(Iterator const & it) | |
{ | |
return it.array[Iterator::index::value]; | |
} | |
}; | |
template <typename Iterator, typename N> | |
struct advance | |
{ | |
typedef typename Iterator::index index; | |
typedef typename Iterator::array_type array_type; | |
typedef array_iterator<array_type, index::value + N::value> type; | |
static type | |
call(Iterator const& i) | |
{ | |
return type(i.array); | |
} | |
}; | |
template <typename Iterator> | |
struct next : advance<Iterator, mpl::int_<1> > {}; | |
template <typename Iterator> | |
struct prior : advance<Iterator, mpl::int_<-1> > {}; | |
template <typename I1, typename I2> | |
struct distance : mpl::minus<typename I2::index, typename I1::index> | |
{ | |
typedef typename | |
mpl::minus< | |
typename I2::index, typename I1::index | |
>::type | |
type; | |
static type | |
call(I1 const&, I2 const&) | |
{ | |
return type(); | |
} | |
}; | |
private: | |
array_iterator<Array, Pos>& operator=(array_iterator<Array, Pos> const&); | |
}; | |
}} | |
#endif |