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Diffstat (limited to 'boost/fusion/adapted/boost_array/array_iterator.hpp')
-rw-r--r-- | boost/fusion/adapted/boost_array/array_iterator.hpp | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/boost/fusion/adapted/boost_array/array_iterator.hpp b/boost/fusion/adapted/boost_array/array_iterator.hpp new file mode 100644 index 0000000000..1246144980 --- /dev/null +++ b/boost/fusion/adapted/boost_array/array_iterator.hpp @@ -0,0 +1,107 @@ +/*============================================================================= + Copyright (c) 2001-2011 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 |