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1 | #ifndef BOOST_METAPARSE_V1_CHANGE_ERROR_MESSAGE_HPP |
2 | #define BOOST_METAPARSE_V1_CHANGE_ERROR_MESSAGE_HPP | |
3 | ||
4 | // Copyright Abel Sinkovics (abel@sinkovics.hu) 2011. | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #include <boost/metaparse/v1/is_error.hpp> | |
10 | #include <boost/metaparse/v1/reject.hpp> | |
11 | ||
12 | #include <boost/mpl/eval_if.hpp> | |
13 | ||
14 | namespace boost | |
15 | { | |
16 | namespace metaparse | |
17 | { | |
18 | namespace v1 | |
19 | { | |
20 | template <class P, class Msg> | |
21 | struct change_error_message | |
22 | { | |
23 | template <class S, class Pos> | |
24 | struct apply : | |
25 | boost::mpl::eval_if< | |
26 | typename is_error<typename P::template apply<S, Pos> >::type, | |
27 | reject<Msg, Pos>, | |
28 | typename P::template apply<S, Pos> | |
29 | > | |
30 | {}; | |
31 | ||
32 | typedef change_error_message type; | |
33 | }; | |
34 | } | |
35 | } | |
36 | } | |
37 | ||
38 | #endif | |
39 |