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+#ifndef BOOST_METAPARSE_V1_CPP11_FIRST_OF_HPP
+#define BOOST_METAPARSE_V1_CPP11_FIRST_OF_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu) 2017.
+// 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/cpp11/impl/nth_of_c.hpp>
+
+#include <boost/metaparse/v1/fail.hpp>
+#include <boost/metaparse/v1/error/index_out_of_range.hpp>
+
+namespace boost
+{
+ namespace metaparse
+ {
+ namespace v1
+ {
+ template <class... Ps>
+ struct first_of
+ {
+ typedef first_of type;
+
+ template <class S, class Pos>
+ struct apply : impl::nth_of_c<0, S, Pos, Ps...> {};
+ };
+
+ template <>
+ struct first_of<> : fail<error::index_out_of_range<0, -1, 0>> {};
+ }
+ }
+}
+
+#endif
+