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diff --git a/boost/metaparse/v1/cpp11/impl/size.hpp b/boost/metaparse/v1/cpp11/impl/size.hpp
new file mode 100644
index 0000000000..a1ffa1b2db
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+++ b/boost/metaparse/v1/cpp11/impl/size.hpp
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+#ifndef BOOST_METAPARSE_V1_CPP11_IMPL_SIZE_HPP
+#define BOOST_METAPARSE_V1_CPP11_IMPL_SIZE_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/v1/cpp11/fwd/string.hpp>
+
+#include <boost/mpl/int.hpp>
+
+#include <type_traits>
+
+namespace boost
+{
+  namespace metaparse
+  {
+    namespace v1
+    {
+      namespace impl
+      {
+        template <class S>
+        struct size;
+
+        template <char... Cs>
+        struct size<string<Cs...>> : boost::mpl::int_<sizeof...(Cs)> {};
+      }
+    }
+  }
+}
+
+#endif
+