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_FRONT_09162005_0343)
8#define FUSION_FRONT_09162005_0343
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/sequence/intrinsic_fwd.hpp>
12#include <boost/fusion/sequence/intrinsic/begin.hpp>
13#include <boost/fusion/iterator/deref.hpp>
14#include <boost/mpl/bool.hpp>
15
16namespace boost { namespace fusion
17{
18 struct fusion_sequence_tag;
19
20 namespace result_of
21 {
22 template <typename Sequence>
23 struct front
24 : result_of::deref<typename result_of::begin<Sequence>::type>
25 {};
26 }
27
28 template <typename Sequence>
29 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
30 inline typename result_of::front<Sequence>::type
31 front(Sequence& seq)
32 {
33 return *fusion::begin(seq);
34 }
35
36 template <typename Sequence>
37 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
38 inline typename result_of::front<Sequence const>::type
39 front(Sequence const& seq)
40 {
41 return *fusion::begin(seq);
42 }
43}}
44
45#endif
46