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 push_front(Sequence const & seq,T const & x)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