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72 lines
2.2 KiB
72 lines
2.2 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2006 Dan Marsden
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_VALUE_OF_IMPL_20060124_2147)
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#define FUSION_VALUE_OF_IMPL_20060124_2147
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/container/vector/convert.hpp>
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#include <boost/fusion/algorithm/transformation/transform.hpp>
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#include <boost/fusion/iterator/value_of.hpp>
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#include <boost/mpl/placeholders.hpp>
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#include <boost/fusion/support/unused.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/config.hpp>
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namespace boost { namespace fusion
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{
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struct zip_view_iterator_tag;
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namespace detail
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{
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struct poly_value_of
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{
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template<typename T>
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struct result;
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template<typename It>
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struct result<poly_value_of(It)>
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: mpl::eval_if<is_same<It, unused_type>,
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mpl::identity<unused_type>,
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result_of::value_of<It> >
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{};
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// never called, but needed for decltype-based result_of (C++0x)
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#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
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template<typename It>
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BOOST_FUSION_GPU_ENABLED
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typename result<poly_value_of(It)>::type
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operator()(It&&) const;
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#endif
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};
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}
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namespace extension
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{
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template<typename Tag>
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struct value_of_impl;
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template<>
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struct value_of_impl<zip_view_iterator_tag>
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{
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template<typename Iterator>
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struct apply
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{
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typedef typename result_of::transform<
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typename Iterator::iterators,
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detail::poly_value_of>::type values;
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typedef typename result_of::as_vector<values>::type type;
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};
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};
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}
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}}
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#endif
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