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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Copyright (c) 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(FUSION_DEREF_IMPL_20061024_1959)
- #define FUSION_DEREF_IMPL_20061024_1959
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/container/vector.hpp>
- #include <boost/fusion/iterator/deref.hpp>
- #include <boost/fusion/algorithm/transformation/transform.hpp>
- #include <boost/fusion/container/vector/convert.hpp>
- #include <boost/fusion/support/unused.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <boost/type_traits/remove_reference.hpp>
- #include <boost/type_traits/remove_const.hpp>
- namespace boost { namespace fusion {
- struct zip_view_iterator_tag;
- namespace detail
- {
- struct poly_deref
- {
- template<typename Sig>
- struct result;
- template<typename It>
- struct result<poly_deref(It)>
- {
- typedef typename remove_const<
- typename remove_reference<It>::type>::type it;
- typedef typename mpl::eval_if<is_same<it, unused_type>,
- mpl::identity<unused_type>,
- result_of::deref<it> >::type type;
- };
- template<typename It>
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- typename result<poly_deref(It)>::type
- operator()(const It& it) const
- {
- return fusion::deref(it);
- }
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- unused_type operator()(unused_type const&) const
- {
- return unused_type();
- }
- };
- }
- namespace extension
- {
- template<typename Tag>
- struct deref_impl;
- template<>
- struct deref_impl<zip_view_iterator_tag>
- {
- template<typename It>
- struct apply
- {
- typedef typename result_of::as_vector<
- typename result_of::transform<typename It::iterators, detail::poly_deref>::type>::type type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(It const& it)
- {
- return type(
- fusion::transform(it.iterators_, detail::poly_deref()));
- }
- };
- };
- }
- }}
- #endif
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