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+/*
+ * Copyright (c) 2002-2005 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.
+ *
+ * Authors: Nathan Binkert
+ */
+
+#ifndef __REFCNT_HH__
+#define __REFCNT_HH__
+
+#include <stddef.h> //For the NULL macro definition
+
+class RefCounted
+{
+ private:
+ int count;
+
+ private:
+ RefCounted(const RefCounted &);
+
+ public:
+ RefCounted() : count(0) {}
+ virtual ~RefCounted() {}
+
+ void incref() { ++count; }
+ void decref() { if (--count <= 0) delete this; }
+};
+
+template <class T>
+class RefCountingPtr
+{
+ protected:
+ T *data;
+
+ void copy(T *d)
+ {
+ data = d;
+ if (data)
+ data->incref();
+ }
+ void del()
+ {
+ if (data)
+ data->decref();
+ }
+ void set(T *d)
+ {
+ if (data == d)
+ return;
+
+ del();
+ copy(d);
+ }
+
+
+ public:
+ RefCountingPtr() : data(NULL) {}
+ RefCountingPtr(T *data) { copy(data); }
+ RefCountingPtr(const RefCountingPtr &r) { copy(r.data); }
+ ~RefCountingPtr() { del(); }
+
+ T *operator->() { return data; }
+ T &operator*() { return *data; }
+ T *get() { return data; }
+
+ const T *operator->() const { return data; }
+ const T &operator*() const { return *data; }
+ const T *get() const { return data; }
+
+ RefCountingPtr &operator=(T *p) { set(p); return *this; }
+ RefCountingPtr &operator=(const RefCountingPtr &r)
+ { return operator=(r.data); }
+
+ bool operator!() const { return data == 0; }
+ operator bool() const { return data != 0; }
+};
+
+template<class T>
+bool operator==(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
+{ return l.get() == r.get(); }
+
+template<class T>
+bool operator==(const RefCountingPtr<T> &l, const T *r)
+{ return l.get() == r; }
+
+template<class T>
+bool operator==(const T &l, const RefCountingPtr<T> &r)
+{ return l == r.get(); }
+
+template<class T>
+bool operator!=(const RefCountingPtr<T> &l, const RefCountingPtr<T> &r)
+{ return l.get() != r.get(); }
+
+template<class T>
+bool operator!=(const RefCountingPtr<T> &l, const T *r)
+{ return l.get() != r; }
+
+template<class T>
+bool operator!=(const T &l, const RefCountingPtr<T> &r)
+{ return l != r.get(); }
+
+#endif // __REFCNT_HH__