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diff --git a/boost/circular_buffer_fwd.hpp b/boost/circular_buffer_fwd.hpp
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+// Forward declaration of the circular buffer and its adaptor.
+
+// Copyright (c) 2003-2008 Jan Gaspar
+
+// Use, modification, and distribution is subject to 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 www.boost.org/libs/circular_buffer for documentation.
+
+#if !defined(BOOST_CIRCULAR_BUFFER_FWD_HPP)
+#define BOOST_CIRCULAR_BUFFER_FWD_HPP
+
+#if defined(_MSC_VER) && _MSC_VER >= 1200
+    #pragma once
+#endif
+
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_STD_ALLOCATOR)
+    #include <memory>
+#else
+    #include <vector>
+#endif
+
+namespace boost {
+
+#if !defined(BOOST_NO_STD_ALLOCATOR)
+    #define BOOST_CB_DEFAULT_ALLOCATOR(T) std::allocator<T>
+#else
+    #define BOOST_CB_DEFAULT_ALLOCATOR(T) BOOST_DEDUCED_TYPENAME std::vector<T>::allocator_type
+#endif
+
+template <class T, class Alloc = BOOST_CB_DEFAULT_ALLOCATOR(T)>
+class circular_buffer;
+
+template <class T, class Alloc = BOOST_CB_DEFAULT_ALLOCATOR(T)>
+class circular_buffer_space_optimized;
+
+#undef BOOST_CB_DEFAULT_ALLOCATOR
+
+} // namespace boost
+
+#endif // #if !defined(BOOST_CIRCULAR_BUFFER_FWD_HPP)