| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2001-2011 Joel de Guzman |
| 3 | |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | ==============================================================================*/ |
| 7 | #if !defined(FUSION_PUSH_FRONT_07162005_0749) |
| 8 | #define FUSION_PUSH_FRONT_07162005_0749 |
| 9 | |
| 10 | #include <boost/fusion/support/config.hpp> |
| 11 | #include <boost/fusion/support/detail/as_fusion_element.hpp> |
| 12 | #include <boost/fusion/view/joint_view/joint_view.hpp> |
| 13 | #include <boost/fusion/view/single_view/single_view.hpp> |
| 14 | #include <boost/fusion/support/is_sequence.hpp> |
| 15 | #include <boost/utility/enable_if.hpp> |
| 16 | |
| 17 | namespace boost { namespace fusion |
| 18 | { |
| 19 | namespace result_of |
| 20 | { |
| 21 | template <typename Sequence, typename T> |
| 22 | struct push_front |
| 23 | { |
| 24 | typedef fusion::single_view<typename detail::as_fusion_element<T>::type> single_view; |
| 25 | typedef joint_view<single_view const, Sequence> type; |
| 26 | }; |
| 27 | } |
| 28 | |
| 29 | template <typename Sequence, typename T> |
| 30 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED |
| 31 | inline typename |
| 32 | lazy_enable_if< |
| 33 | traits::is_sequence<Sequence> |
| 34 | , result_of::push_front<Sequence const, T> |
| 35 | >::type |
| 36 | push_front(Sequence const& seq, T const& x) |
| 37 | { |
| 38 | typedef typename result_of::push_front<Sequence const, T> push_front; |
| 39 | typedef typename push_front::single_view single_view; |
| 40 | typedef typename push_front::type result; |
| 41 | single_view x_(x); |
| 42 | return result(x_, seq); |
| 43 | } |
| 44 | }} |
| 45 | |
| 46 | #endif |
| 47 | |
| 48 |