list/detail/reverse_cons.hpp

0001 /*=============================================================================
0002     Copyright (c) 2011 Eric Niebler
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007 #if !defined(BOOST_FUSION_REVERSE_CONS_HPP_INCLUDED)
0008 #define BOOST_FUSION_REVERSE_CONS_HPP_INCLUDED
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/fusion/container/list/cons_fwd.hpp>
0012
0013 namespace boost { namespace fusion { namespace detail
0014 {
0015     ////////////////////////////////////////////////////////////////////////////
0016     template<typename Cons, typename State = nil_>
0017     struct reverse_cons;
0018
0019     template<typename Car, typename Cdr, typename State>
0020     struct reverse_cons<cons<Car, Cdr>, State>
0021     {
0022         typedef reverse_cons<Cdr, cons<Car, State> > impl;
0023         typedef typename impl::type type;
0024
0025         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0026         static type call(cons<Car, Cdr> const &cons, State const &state = State())
0027         {
0028             typedef fusion::cons<Car, State> cdr_type;
0029             return impl::call(cons.cdr, cdr_type(cons.car, state));
0030         }
0031     };
0032
0033     template<typename State>
0034     struct reverse_cons<nil_, State>
0035     {
0036         typedef State type;
0037
0038         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0039         static State const &call(nil_ const &, State const &state = State())
0040         {
0041             return state;
0042         }
0043     };
0044 }}}
0045
0046 #endif