forked from boostorg/fusion
2114bfca6c
Note 1: Forwarding functions are specified as a C++14 constexpr since std::forward is not a constexpr within C++11. Note 2: Though I'm not sure why it doesn't compile, some declarations are specified as a C++14 constexpr or non-constexpr. Note 3: Boost.Tuple adaptation and TR1-based tuple implementations are not constexpr.
48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2009 Hartmut Kaiser
|
|
|
|
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(BOOST_FUSION_NVIEW_AT_IMPL_SEP_24_2009_0225PM)
|
|
#define BOOST_FUSION_NVIEW_AT_IMPL_SEP_24_2009_0225PM
|
|
|
|
#include <boost/fusion/support/config.hpp>
|
|
#include <boost/fusion/sequence/intrinsic/at.hpp>
|
|
|
|
namespace boost { namespace fusion
|
|
{
|
|
struct nview_tag;
|
|
|
|
namespace extension
|
|
{
|
|
template<typename Tag>
|
|
struct at_impl;
|
|
|
|
template<>
|
|
struct at_impl<nview_tag>
|
|
{
|
|
template<typename Sequence, typename N>
|
|
struct apply
|
|
{
|
|
typedef typename Sequence::sequence_type sequence_type;
|
|
typedef typename Sequence::index_type index_type;
|
|
|
|
typedef typename result_of::at<index_type, N>::type index;
|
|
typedef typename result_of::at<sequence_type, index>::type type;
|
|
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
|
static type
|
|
call(Sequence& seq)
|
|
{
|
|
return fusion::at<index>(seq.seq);
|
|
}
|
|
};
|
|
};
|
|
}
|
|
|
|
}}
|
|
|
|
#endif
|