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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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