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1 | #ifndef BOOST_METAPARSE_V1_TRANSFORM_ERROR_HPP |
2 | #define BOOST_METAPARSE_V1_TRANSFORM_ERROR_HPP | |
3 | ||
4 | // Copyright Abel Sinkovics (abel@sinkovics.hu) 2015. | |
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 | ||
11 | #include <boost/mpl/eval_if.hpp> | |
12 | ||
13 | namespace boost | |
14 | { | |
15 | namespace metaparse | |
16 | { | |
17 | namespace v1 | |
18 | { | |
19 | template <class P, class F> | |
20 | struct transform_error | |
21 | { | |
22 | template <class S, class Pos> | |
23 | struct apply : | |
24 | boost::mpl::eval_if< | |
25 | typename is_error<typename P::template apply<S, Pos> >::type, | |
26 | typename F::template apply< | |
27 | typename P::template apply<S, Pos>::type | |
28 | >, | |
29 | typename P::template apply<S, Pos> | |
30 | > | |
31 | {}; | |
32 | ||
33 | typedef transform_error type; | |
34 | }; | |
35 | } | |
36 | } | |
37 | } | |
38 | ||
39 | #endif | |
40 |