boostorg/fusion
1
0
Fork 1
mirror of https://github.com/boostorg/fusion.git synced 2025-07-29 12:07:36 +02:00
Code Issues Packages Projects Releases Wiki Activity

corrected reverse_view

Browse Source 
[SVN r58299]
This commit is contained in:
Christopher Schmidt
2009-12-11 21:01:22 +00:00
parent f1da55c1e9
commit 2587757d47
266 changed files with 2236 additions and 2096 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
include/boost/fusion/view/reverse_view/detail/at_impl.hpp Normal file
View File

@ -0,0 +1,41 @@
/*=============================================================================
Copyright (c) 2009 Christopher Schmidt
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_VIEW_REVERSE_VIEW_DETAIL_AT_IMPL_HPP
#define BOOST_FUSION_VIEW_REVERSE_VIEW_DETAIL_AT_IMPL_HPP
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/mpl/minus.hpp>
#include <boost/mpl/int.hpp>
namespace boost { namespace fusion { namespace extension
{
template <typename>
struct at_impl;
template <>
struct at_impl<reverse_view_tag>
{
template <typename Seq, typename N>
struct apply
{
typedef mpl::minus<typename Seq::size, mpl::int_<1>, N> real_n;
typedef typename
result_of::at<typename Seq::seq_type, real_n>::type
type;
static type
call(Seq& seq)
{
return fusion::at<real_n>(seq.seq);
}
};
};
}}}
#endif

33
include/boost/fusion/view/reverse_view/detail/value_at_impl.hpp Normal file
View File

@ -0,0 +1,33 @@
/*=============================================================================
Copyright (c) 2009 Christopher Schmidt
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_VIEW_REVERSE_VIEW_DETAIL_VALUE_AT_IMPL_HPP
#define BOOST_FUSION_VIEW_REVERSE_VIEW_DETAIL_VALUE_AT_IMPL_HPP
#include <boost/fusion/sequence/intrinsic/value_at.hpp>
#include <boost/mpl/minus.hpp>
#include <boost/mpl/int.hpp>
namespace boost { namespace fusion { namespace extension
{
template <typename>
struct value_at_impl;
template <>
struct value_at_impl<reverse_view_tag>
{
template <typename Seq, typename N>
struct apply
: result_of::value_at<
typename Seq::seq_type
, mpl::minus<typename Seq::size, mpl::int_<1>, N>
>
{};
};
}}}
#endif

12
include/boost/fusion/view/reverse_view/reverse_view.hpp
View File

@ -13,6 +13,8 @@
#include <boost/fusion/view/reverse_view/reverse_view_iterator.hpp>
#include <boost/fusion/view/reverse_view/detail/begin_impl.hpp>
#include <boost/fusion/view/reverse_view/detail/end_impl.hpp>
#include <boost/fusion/view/reverse_view/detail/at_impl.hpp>
#include <boost/fusion/view/reverse_view/detail/value_at_impl.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
@ -28,7 +30,6 @@ namespace boost { namespace fusion
{
struct reverse_view_tag;
struct fusion_sequence_tag;
struct bidirectional_traversal_tag;
template <typename Sequence>
struct reverse_view : sequence_base<reverse_view<Sequence> >
@ -37,13 +38,8 @@ namespace boost { namespace fusion
typedef fusion_sequence_tag tag; // this gets picked up by MPL
typedef mpl::true_ is_view;
typedef typename
mpl::eval_if<
traits::is_associative<Sequence>
, mpl::inherit2<bidirectional_traversal_tag,associative_tag>
, mpl::identity<bidirectional_traversal_tag>
>::type
category;
typedef Sequence seq_type;
typedef typename traits::category_of<Sequence>::type category;
typedef typename result_of::begin<Sequence>::type first_type;
typedef typename result_of::end<Sequence>::type last_type;
typedef typename result_of::size<Sequence>::type size;