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1 | #ifndef BOOST_METAPARSE_V1_IS_ERROR_HPP |
2 | #define BOOST_METAPARSE_V1_IS_ERROR_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/fail_tag.hpp> | |
10 | ||
11 | #include <boost/mpl/tag.hpp> | |
12 | #include <boost/mpl/vector.hpp> | |
13 | ||
14 | #include <boost/type_traits/is_same.hpp> | |
15 | ||
16 | namespace boost | |
17 | { | |
18 | namespace metaparse | |
19 | { | |
20 | namespace v1 | |
21 | { | |
22 | template <class T = boost::mpl::na> | |
23 | struct is_error : | |
24 | boost::is_same< | |
25 | fail_tag, | |
26 | typename boost::mpl::tag<typename T::type>::type | |
27 | > | |
28 | {}; | |
29 | ||
30 | template <> | |
31 | struct is_error<boost::mpl::na> | |
32 | { | |
33 | typedef is_error type; | |
34 | ||
35 | template <class T = boost::mpl::na> | |
36 | struct apply : is_error<T> {}; | |
37 | }; | |
38 | } | |
39 | } | |
40 | } | |
41 | ||
42 | #endif | |
43 |