72 lines
2.2 KiB
Plaintext
72 lines
2.2 KiB
Plaintext
|
/*=============================================================================
|
||
|
|
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
|