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diff --git a/boost/random/detail/generator_bits.hpp b/boost/random/detail/generator_bits.hpp
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+++ b/boost/random/detail/generator_bits.hpp
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+/* boost random/detail/generator_bits.hpp header file
+ *
+ * Copyright Steven Watanabe 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)
+ *
+ * See http://www.boost.org for most recent version including documentation.
+ *
+ * $Id: generator_bits.hpp 72951 2011-07-07 04:57:37Z steven_watanabe $
+ *
+ */
+
+#ifndef BOOST_RANDOM_DETAIL_GENERATOR_BITS_HPP
+#define BOOST_RANDOM_DETAIL_GENERATOR_BITS_HPP
+
+#include <boost/limits.hpp>
+
+namespace boost {
+namespace random {
+namespace detail {
+
+// This is a temporary measure that retains backwards
+// compatibility.
+template<class URNG>
+struct generator_bits {
+    static std::size_t value() {
+        return std::numeric_limits<typename URNG::result_type>::digits;
+    }
+};
+
+} // namespace detail
+} // namespace random
+} // namespace boost
+
+#endif // BOOST_RANDOM_DETAIL_GENERATOR_BITS_HPP