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diff --git a/base/callback.hh b/base/callback.hh
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-/*
- * Copyright (c) 2003-2005 The Regents of The University of Michigan
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met: redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer;
- * redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution;
- * neither the name of the copyright holders nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef __CALLBACK_HH__
-#define __CALLBACK_HH__
-
-#include <list>
-
-/**
- * Generic callback class.  This base class provides a virtual process
- * function that gets called when the callback queue is processed.
- */
-class Callback
-{
-  public:
-    /**
-     * virtualize the destructor to make sure that the correct one
-     * gets called.
-     */
-    virtual ~Callback() {}
-
-    /**
-     * virtual process function that is invoked when the callback
-     * queue is executed.
-     */
-    virtual void process() = 0;
-};
-
-class CallbackQueue
-{
-  protected:
-    /**
-     * Simple typedef for the data structure that stores all of the
-     * callbacks.
-     */
-    typedef std::list<Callback *> queue;
-
-    /**
-     * List of all callbacks.  To be called in fifo order.
-     */
-    queue callbacks;
-
-  public:
-    /**
-     * Add a callback to the end of the queue
-     * @param callback the callback to be added to the queue
-     */
-    void add(Callback *callback)
-    {
-        callbacks.push_back(callback);
-    }
-
-    /**
-     * Find out if there are any callbacks in the queue
-     */
-    bool empty() const { return callbacks.empty(); }
-
-    /**
-     * process all callbacks
-     */
-    void process()
-    {
-        queue::iterator i = callbacks.begin();
-        queue::iterator end = callbacks.end();
-
-        while (i != end) {
-            (*i)->process();
-            ++i;
-        }
-    }
-
-    /**
-     * clear the callback queue
-     */
-    void clear()
-    {
-        callbacks.clear();
-    }
-};
-
-/// Helper template class to turn a simple class member function into
-/// a callback.
-template <class T, void (T::* F)()>
-class MakeCallback : public Callback
-{
-  private:
-    T *object;
-
-  public:
-    MakeCallback(T *o)
-        : object(o)
-    { }
-
-    void process() { (object->*F)(); }
-};
-
-#endif // __CALLBACK_HH__