metaparse/v1/unless_error.hpp

0001 #ifndef BOOST_METAPARSE_V1_UTIL_UNLESS_ERROR_HPP
0002 #define BOOST_METAPARSE_V1_UTIL_UNLESS_ERROR_HPP
0003
0004 // Copyright Abel Sinkovics (abel@sinkovics.hu)  2011.
0005 // Distributed under the Boost Software License, Version 1.0.
0006 //    (See accompanying file LICENSE_1_0.txt or copy at
0007 //          http://www.boost.org/LICENSE_1_0.txt)
0008
0009 #include <boost/metaparse/v1/is_error.hpp>
0010
0011 #include <boost/mpl/equal_to.hpp>
0012 #include <boost/mpl/eval_if.hpp>
0013
0014 namespace boost
0015 {
0016   namespace metaparse
0017   {
0018     namespace v1
0019     {
0020       template <class T, class NotErrorCase>
0021       struct unless_error :
0022         boost::mpl::eval_if<typename is_error<T>::type, T, NotErrorCase>
0023       {};
0024     }
0025   }
0026 }
0027
0028 #endif
0029