134 lines
4.0 KiB
Plaintext
134 lines
4.0 KiB
Plaintext
|
/*==============================================================================
|
||
|
|
Copyright (c) 2013 Jamboree
|
||
|
|
|
||
|
|
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)
|
||
|
|
==============================================================================*/
|
||
|
|
#ifndef BOOST_FUSION_FLATTEN_VIEW_HPP_INCLUDED
|
||
|
|
#define BOOST_FUSION_FLATTEN_VIEW_HPP_INCLUDED
|
||
|
|
|
||
|
|
|
||
|
|
#include <boost/fusion/support/config.hpp>
|
||
|
|
#include <boost/mpl/bool.hpp>
|
||
|
|
#include <boost/mpl/single_view.hpp>
|
||
|
|
#include <boost/fusion/support/detail/access.hpp>
|
||
|
|
#include <boost/fusion/support/is_view.hpp>
|
||
|
|
#include <boost/fusion/support/category_of.hpp>
|
||
|
|
#include <boost/fusion/support/sequence_base.hpp>
|
||
|
|
#include <boost/fusion/sequence/intrinsic/begin.hpp>
|
||
|
|
#include <boost/fusion/sequence/intrinsic/end.hpp>
|
||
|
|
#include <boost/fusion/view/flatten_view/flatten_view_iterator.hpp>
|
||
|
|
|
||
|
|
|
||
|
|
namespace boost { namespace fusion
|
||
|
|
{
|
||
|
|
struct forward_traversal_tag;
|
||
|
|
struct flatten_view_tag;
|
||
|
|
|
||
|
|
template <typename Sequence>
|
||
|
|
struct flatten_view
|
||
|
|
: sequence_base<flatten_view<Sequence> >
|
||
|
|
{
|
||
|
|
typedef flatten_view_tag fusion_tag;
|
||
|
|
typedef fusion_sequence_tag tag; // this gets picked up by MPL
|
||
|
|
typedef mpl::true_ is_view;
|
||
|
|
typedef forward_traversal_tag category;
|
||
|
|
|
||
|
|
typedef Sequence sequence_type;
|
||
|
|
typedef typename result_of::begin<Sequence>::type first_type;
|
||
|
|
typedef typename result_of::end<Sequence>::type last_type;
|
||
|
|
|
||
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||
|
|
explicit flatten_view(Sequence& seq)
|
||
|
|
: seq(seq)
|
||
|
|
{}
|
||
|
|
|
||
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||
|
|
first_type first() const { return fusion::begin(seq); }
|
||
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||
|
|
last_type last() const { return fusion::end(seq); }
|
||
|
|
|
||
|
|
typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq;
|
||
|
|
};
|
||
|
|
}}
|
||
|
|
|
||
|
|
namespace boost { namespace fusion { namespace extension
|
||
|
|
{
|
||
|
|
template<>
|
||
|
|
struct begin_impl<flatten_view_tag>
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef typename Sequence::first_type first_type;
|
||
|
|
|
||
|
|
typedef typename
|
||
|
|
result_of::begin<
|
||
|
|
mpl::single_view<
|
||
|
|
typename Sequence::sequence_type> >::type
|
||
|
|
root_iterator;
|
||
|
|
|
||
|
|
typedef
|
||
|
|
detail::seek_descent<root_iterator, first_type>
|
||
|
|
seek_descent;
|
||
|
|
|
||
|
|
typedef typename seek_descent::type type;
|
||
|
|
|
||
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||
|
|
static inline
|
||
|
|
type call(Sequence& seq)
|
||
|
|
{
|
||
|
|
return seek_descent::apply(root_iterator(), seq.first());
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct end_impl<flatten_view_tag>
|
||
|
|
{
|
||
|
|
template<typename Sequence>
|
||
|
|
struct apply
|
||
|
|
{
|
||
|
|
typedef typename Sequence::last_type last_type;
|
||
|
|
|
||
|
|
typedef typename
|
||
|
|
result_of::end<
|
||
|
|
mpl::single_view<
|
||
|
|
typename Sequence::sequence_type> >::type
|
||
|
|
type;
|
||
|
|
|
||
|
|
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
|
||
|
|
static inline
|
||
|
|
type call(Sequence&)
|
||
|
|
{
|
||
|
|
return type();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct size_impl<flatten_view_tag>
|
||
|
|
{
|
||
|
|
template <typename Sequence>
|
||
|
|
struct apply
|
||
|
|
: result_of::distance
|
||
|
|
<
|
||
|
|
typename result_of::begin<Sequence>::type
|
||
|
|
, typename result_of::end<Sequence>::type
|
||
|
|
>
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
|
||
|
|
template<>
|
||
|
|
struct empty_impl<flatten_view_tag>
|
||
|
|
{
|
||
|
|
template <typename Sequence>
|
||
|
|
struct apply
|
||
|
|
: result_of::empty<typename Sequence::sequence_type>
|
||
|
|
{};
|
||
|
|
};
|
||
|
|
}}}
|
||
|
|
|
||
|
|
|
||
|
|
#endif
|