#ifndef BOOST_METAPARSE_V1_IS_ERROR_HPP #define BOOST_METAPARSE_V1_IS_ERROR_HPP // Copyright Abel Sinkovics (abel@sinkovics.hu) 2011. // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <boost/metaparse/v1/fail_tag.hpp> #include <boost/mpl/tag.hpp> #include <boost/mpl/vector.hpp> #include <boost/type_traits/is_same.hpp> namespace boost { namespace metaparse { namespace v1 { template <class T = boost::mpl::na> struct is_error : boost::is_same< fail_tag, typename boost::mpl::tag<typename T::type>::type > {}; template <> struct is_error<boost::mpl::na> { typedef is_error type; template <class T = boost::mpl::na> struct apply : is_error<T> {}; }; } } } #endif