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+#ifndef BOOST_METAPARSE_V1_IMPL_CONCAT_HPP
+#define BOOST_METAPARSE_V1_IMPL_CONCAT_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/preprocessor/arithmetic/dec.hpp>
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/arithmetic/mul.hpp>
+#include <boost/preprocessor/arithmetic/sub.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/punctuation/comma_if.hpp>
+#include <boost/preprocessor/repetition/enum.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+
+namespace boost
+{
+ namespace metaparse
+ {
+ namespace v1
+ {
+ namespace impl
+ {
+ template <class A, class B>
+ struct concat;
+
+#ifdef BOOST_METAPARSE_VARIADIC_STRING
+ template <char... As, char... Bs>
+ struct concat<string<As...>, string<Bs...>> : string<As..., Bs...> {};
+#else
+ template <class A, class B>
+ struct concat_impl;
+
+ #ifdef BOOST_METAPARSE_ARG
+ # error BOOST_METAPARSE_ARG already defined
+ #endif
+ #define BOOST_METAPARSE_ARG(z, n, unused) \
+ BOOST_PP_CAT(B, BOOST_PP_INC(n))
+
+ #ifdef BOOST_METAPARSE_CONCAT
+ # error BOOST_METAPARSE_CONCAT already defined
+ #endif
+ #define BOOST_METAPARSE_CONCAT(z, n, unused) \
+ template < \
+ BOOST_PP_ENUM_PARAMS(n, int A) BOOST_PP_COMMA_IF(n) \
+ BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, int B) \
+ > \
+ struct \
+ concat_impl< \
+ string< \
+ BOOST_PP_ENUM_PARAMS(n, A) \
+ BOOST_PP_COMMA_IF( \
+ BOOST_PP_MUL( \
+ BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \
+ n \
+ ) \
+ ) \
+ BOOST_PP_ENUM( \
+ BOOST_PP_SUB(BOOST_METAPARSE_LIMIT_STRING_SIZE, n), \
+ BOOST_NO_CHAR BOOST_PP_TUPLE_EAT(3), \
+ ~ \
+ ) \
+ >, \
+ string< \
+ BOOST_PP_ENUM_PARAMS(BOOST_METAPARSE_LIMIT_STRING_SIZE, B) \
+ > \
+ > : \
+ concat< \
+ string<BOOST_PP_ENUM_PARAMS(n, A) BOOST_PP_COMMA_IF(n) B0>, \
+ string< \
+ BOOST_PP_ENUM( \
+ BOOST_PP_DEC(BOOST_METAPARSE_LIMIT_STRING_SIZE), \
+ BOOST_METAPARSE_ARG, \
+ ~ \
+ ) \
+ > \
+ > \
+ {};
+
+ BOOST_PP_REPEAT(
+ BOOST_METAPARSE_LIMIT_STRING_SIZE,
+ BOOST_METAPARSE_CONCAT,
+ ~
+ )
+
+ #undef BOOST_METAPARSE_ARG
+ #undef BOOST_METAPARSE_CONCAT
+
+ template <class S>
+ struct concat<S, string<> > : S {};
+
+ template <class A, class B>
+ struct concat : concat_impl<A, B> {};
+#endif
+ }
+ }
+ }
+}
+
+#endif
+