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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2005-2006 Dan Marsden | |
92f5a8d4 | 4 | Copyright (c) 2018 Kohei Takahashi |
7c673cae FG |
5 | |
6 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
7 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
8 | ==============================================================================*/ | |
9 | #if !defined(BOOST_FUSION_VALUE_AT_IMPL_20061101_0745) | |
10 | #define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745 | |
11 | ||
12 | #include <boost/fusion/support/config.hpp> | |
7c673cae | 13 | #include <boost/fusion/sequence/intrinsic/value_at.hpp> |
92f5a8d4 | 14 | #include <boost/utility/result_of.hpp> |
7c673cae FG |
15 | |
16 | namespace boost { namespace fusion { | |
17 | struct transform_view_tag; | |
18 | struct transform_view2_tag; | |
19 | ||
20 | namespace extension | |
21 | { | |
22 | template<typename Tag> | |
23 | struct value_at_impl; | |
24 | ||
25 | template<> | |
26 | struct value_at_impl<transform_view_tag> | |
27 | { | |
28 | template<typename Seq, typename N> | |
29 | struct apply | |
30 | { | |
31 | typedef typename Seq::transform_type F; | |
92f5a8d4 TL |
32 | typedef typename result_of::value_at<typename Seq::sequence_type, N>::type value_type; |
33 | typedef typename boost::result_of<F(value_type)>::type type; | |
7c673cae FG |
34 | }; |
35 | }; | |
36 | ||
37 | template<> | |
38 | struct value_at_impl<transform_view2_tag> | |
39 | { | |
40 | template<typename Seq, typename N> | |
41 | struct apply | |
42 | { | |
43 | typedef typename Seq::transform_type F; | |
92f5a8d4 TL |
44 | typedef typename result_of::value_at<typename Seq::sequence1_type, N>::type value1_type; |
45 | typedef typename result_of::value_at<typename Seq::sequence2_type, N>::type value2_type; | |
46 | typedef typename boost::result_of<F(value1_type, value2_type)>::type type; | |
7c673cae FG |
47 | }; |
48 | }; | |
49 | } | |
50 | }} | |
51 | ||
52 | #endif |