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 
40