1 files changed, 122 insertions, 0 deletions
diff --git a/src/sharedptr.h b/src/sharedptr.h
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+++ b/src/sharedptr.h
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+#ifndef ABAKUS_SHARED_PTR_H
+#define ABAKUS_SHARED_PTR_H
+/*
+ * sharedptr.h - part of abakus
+ * Copyright (C) 2004, 2005 Michael Pyne <michael.pyne@kdemail.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02110-1301  USA
+ */
+
+#include <kdebug.h>
+
+template <class T>
+class SharedPtr
+{
+public:
+    typedef T value_type;
+
+    class Data
+    {
+    public:
+        Data(T *ptr = 0, unsigned refCount = 1) : m_ptr(ptr), m_refCount(refCount)
+        {
+        }
+
+        void deref()
+        {
+            --m_refCount;
+
+            if(!m_refCount) {
+                delete m_ptr;
+                m_ptr = 0;
+            }
+        }
+
+        void ref()
+        {
+            ++m_refCount;
+        }
+
+        T *ptr() { return m_ptr; }
+        const T* ptr() const { return m_ptr; }
+
+        unsigned refCount() const { return m_refCount; }
+
+    private:
+        T *m_ptr;
+        unsigned m_refCount;
+    };
+
+    SharedPtr() : m_data(new Data)
+    {
+    }
+
+    SharedPtr(T* ptr) : m_data(new Data(ptr))
+    {
+    }
+
+    SharedPtr(const SharedPtr<T> &other) : m_data(other.m_data)
+    {
+        m_data->ref();
+    }
+
+    ~SharedPtr()
+    {
+        m_data->deref();
+    }
+
+    SharedPtr<T> &operator=(const SharedPtr<T> &other)
+    {
+        if(&other == this)
+            return *this;
+
+        m_data->deref();
+        m_data = other.m_data;
+        m_data->ref();
+
+        return *this;
+    }
+
+    T *operator ->()
+    {
+        return m_data->ptr();
+    }
+
+    const T *operator ->() const
+    {
+        return m_data->ptr();
+    }
+
+    T &operator *()
+    {
+        return *m_data->ptr();
+    }
+
+    const T& operator *() const
+    {
+        return *m_data->ptr();
+    }
+
+    bool isNull() const { return m_data->ptr() == 0; }
+
+    unsigned refCount() const { return m_data->refCount(); }
+
+private:
+    Data *m_data;
+};
+
+#endif /* ABAKUS_SHARED_PTR_H */
+
+// vim: set et ts=8 sw=4: