55 lines
2.1 KiB
Plaintext
55 lines
2.1 KiB
Plaintext
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_VALUE_AT_IMPL_20061101_0745)
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#define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/apply.hpp>
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#include <boost/fusion/view/transform_view/detail/apply_transform_result.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
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namespace boost { namespace fusion {
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struct transform_view_tag;
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struct transform_view2_tag;
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namespace extension
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{
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template<typename Tag>
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struct value_at_impl;
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template<>
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struct value_at_impl<transform_view_tag>
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{
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template<typename Seq, typename N>
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struct apply
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{
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typedef typename Seq::transform_type F;
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typedef detail::apply_transform_result<F> transform_type;
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typedef typename boost::fusion::result_of::value_at<typename Seq::sequence_type, N>::type value_type;
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typedef typename mpl::apply<transform_type, value_type>::type type;
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};
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};
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template<>
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struct value_at_impl<transform_view2_tag>
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{
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template<typename Seq, typename N>
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struct apply
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{
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typedef typename Seq::transform_type F;
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typedef detail::apply_transform_result<F> transform_type;
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typedef typename boost::fusion::result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
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typedef typename boost::fusion::result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
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typedef typename mpl::apply<transform_type, value1_type, value2_type>::type type;
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};
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};
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}
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}}
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#endif
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