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added value_at_impl for transform view

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[SVN r35804]
This commit is contained in:
Dan Marsden
2006-11-01 08:01:01 +00:00
parent 6ca462baa0
commit 2454202163
2 changed files with 55 additions and 0 deletions
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54
include/boost/fusion/sequence/view/transform_view/detail/value_at_impl.hpp Normal file
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/*=============================================================================
Copyright (c) 2001-2006 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
Use, modification and distribution is subject to 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_VALUE_AT_IMPL_20061101_0745)
#define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
#include <boost/mpl/apply.hpp>
#include <boost/fusion/sequence/view/transform_view/detail/apply_transform_result.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
namespace boost { namespace fusion {
struct transform_view_tag;
struct transform_view2_tag;
namespace extension
{
template<typename Tag>
struct value_at_impl;
template<>
struct value_at_impl<transform_view_tag>
{
template<typename Seq, typename N>
struct apply
{
typedef typename Seq::transform_type F;
typedef detail::apply_transform_result<F> transform_type;
typedef typename boost::fusion::result_of::at<typename Seq::sequence_type, N>::type value_type;
typedef typename mpl::apply<transform_type, value_type>::type type;
};
};
template<>
struct value_at_impl<transform_view2_tag>
{
template<typename Seq, typename N>
struct apply
{
typedef typename Seq::transform_type F;
typedef detail::apply_transform_result<F> transform_type;
typedef typename boost::fusion::result_of::at<typename Seq::sequence1_type, N>::type value1_type;
typedef typename boost::fusion::result_of::at<typename Seq::sequence2_type, N>::type value2_type;
typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
};
};
}
}}
#endif

1
include/boost/fusion/sequence/view/transform_view/transform_view.hpp
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@ -17,6 +17,7 @@
#include <boost/fusion/sequence/view/transform_view/detail/begin_impl.hpp>
#include <boost/fusion/sequence/view/transform_view/detail/end_impl.hpp>
#include <boost/fusion/sequence/view/transform_view/detail/at_impl.hpp>
#include <boost/fusion/sequence/view/transform_view/detail/value_at_impl.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>