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+#ifndef BOOST_METAPARSE_V1_IMPL_AT_C_HPP
+#define BOOST_METAPARSE_V1_IMPL_AT_C_HPP
+
+// Copyright Abel Sinkovics (abel@sinkovics.hu) 2013.
+// 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/config.hpp>
+#include <boost/metaparse/v1/fwd/string.hpp>
+
+#include <boost/mpl/char.hpp>
+
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/repeat.hpp>
+
+namespace boost
+{
+ namespace metaparse
+ {
+ namespace v1
+ {
+ namespace impl
+ {
+ template <class S, int N>
+ struct at_c;
+
+#ifdef BOOST_METAPARSE_VARIADIC_STRING
+ template <char C, char... Cs, int N>
+ struct at_c<string<C, Cs...>, N> : at_c<string<Cs...>, N - 1> {};
+
+ template <char C, char... Cs>
+ struct at_c<string<C, Cs...>, 0> : boost::mpl::char_<C> {};
+#else
+ #ifdef BOOST_METAPARSE_STRING_CASE
+ # error BOOST_METAPARSE_STRING_CASE is already defined
+ #endif
+ #define BOOST_METAPARSE_STRING_CASE(z, n, unused) \
+ template < \
+ BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int C) \
+ > \
+ struct \
+ at_c< \
+ string< \
+ BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, C) \
+ >, \
+ n \
+ > : \
+ boost::mpl::char_<BOOST_PP_CAT(C, n)> \
+ {};
+
+ BOOST_PP_REPEAT(
+ BOOST_METAPARSE_LIMIT_STRING_SIZE,
+ BOOST_METAPARSE_STRING_CASE,
+ ~
+ )
+
+ #undef BOOST_METAPARSE_STRING_CASE
+#endif
+ }
+ }
+ }
+}
+
+#endif
+