1 #ifndef BOOST_METAPARSE_V1_UTIL_UNLESS_ERROR_HPP
2 #define BOOST_METAPARSE_V1_UTIL_UNLESS_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/is_error.hpp>
10 
11 #include <boost/mpl/equal_to.hpp>
12 #include <boost/mpl/eval_if.hpp>
13 
14 namespace boost
15 {
16   namespace metaparse
17   {
18     namespace v1
19     {
20       template <class T, class NotErrorCase>
21       struct unless_error :
22         boost::mpl::eval_if<typename is_error<T>::type, T, NotErrorCase>
23       {};
24     }
25   }
26 }
27 
28 #endif
29 
30