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48 lines
1.6 KiB
48 lines
1.6 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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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(FUSION_PUSH_FRONT_07162005_0749)
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#define FUSION_PUSH_FRONT_07162005_0749
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/as_fusion_element.hpp>
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#include <boost/fusion/view/joint_view/joint_view.hpp>
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#include <boost/fusion/view/single_view/single_view.hpp>
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#include <boost/fusion/support/is_sequence.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace fusion
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{
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namespace result_of
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{
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template <typename Sequence, typename T>
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struct push_front
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{
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typedef fusion::single_view<typename detail::as_fusion_element<T>::type> single_view;
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typedef joint_view<single_view const, Sequence> type;
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};
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}
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template <typename Sequence, typename T>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename
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lazy_enable_if<
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traits::is_sequence<Sequence>
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, result_of::push_front<Sequence const, T>
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>::type
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push_front(Sequence const& seq, T const& x)
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{
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typedef typename result_of::push_front<Sequence const, T> push_front;
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typedef typename push_front::single_view single_view;
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typedef typename push_front::type result;
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single_view x_(x);
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return result(x_, seq);
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}
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}}
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#endif
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