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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_VALUE_OF_IMPL_20060124_2147)
- #define FUSION_VALUE_OF_IMPL_20060124_2147
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/container/vector/convert.hpp>
- #include <boost/fusion/algorithm/transformation/transform.hpp>
- #include <boost/fusion/iterator/value_of.hpp>
- #include <boost/mpl/placeholders.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/config.hpp>
- namespace boost { namespace fusion
- {
- struct zip_view_iterator_tag;
- namespace detail
- {
- struct poly_value_of
- {
- template<typename T>
- struct result;
- template<typename It>
- struct result<poly_value_of(It)>
- : mpl::eval_if<is_same<It, unused_type>,
- mpl::identity<unused_type>,
- result_of::value_of<It> >
- {};
- // never called, but needed for decltype-based result_of (C++0x)
- #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
- template<typename It>
- BOOST_FUSION_GPU_ENABLED
- typename result<poly_value_of(It)>::type
- operator()(It&&) const;
- #endif
- };
- }
- namespace extension
- {
- template<typename Tag>
- struct value_of_impl;
- template<>
- struct value_of_impl<zip_view_iterator_tag>
- {
- template<typename Iterator>
- struct apply
- {
- typedef typename result_of::transform<
- typename Iterator::iterators,
- detail::poly_value_of>::type values;
- typedef typename result_of::as_vector<values>::type type;
- };
- };
- }
- }}
- #endif
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