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+#ifndef BOOST_METAPARSE_V1_EXCEPT_HPP
+#define BOOST_METAPARSE_V1_EXCEPT_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu) 2009 - 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/is_error.hpp>
+#include <boost/metaparse/v1/accept.hpp>
+#include <boost/metaparse/v1/reject.hpp>
+
+#include <boost/mpl/if.hpp>
+
+namespace boost
+{
+ namespace metaparse
+ {
+ namespace v1
+ {
+ template <class P, class Result, class ErrorMsg>
+ struct except
+ {
+ typedef except type;
+
+ template <class S, class Pos>
+ struct apply :
+ boost::mpl::if_<
+ is_error<typename P::template apply<S, Pos> >,
+ accept<Result, S, Pos>,
+ reject<ErrorMsg, Pos>
+ >
+ {};
+ };
+ }
+ }
+}
+
+#endif
+