--- /dev/null
+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
+
+#if !defined(INCLUDED_GENERIC_REFERENCECOUNTED_H)
+#define INCLUDED_GENERIC_REFERENCECOUNTED_H
+
+/// \file
+/// \brief 'smart' pointers and references.
+
+#include <algorithm>
+
+template<typename Type>
+class IncRefDecRefCounter
+{
+public:
+ void increment(Type& value)
+ {
+ value.IncRef();
+ }
+ void decrement(Type& value)
+ {
+ value.DecRef();
+ }
+};
+
+/// \brief A smart-pointer that uses a counter stored in the object pointed-to.
+template<typename Type, typename Counter = IncRefDecRefCounter<Type> >
+class SmartPointer : public Counter
+{
+ Type* m_value;
+public:
+
+ SmartPointer(const SmartPointer& other)
+ : m_value(other.m_value)
+ {
+ Counter::increment(*m_value);
+ }
+ explicit SmartPointer(Type* value)
+ : m_value(value)
+ {
+ Counter::increment(*m_value);
+ }
+ ~SmartPointer()
+ {
+ Counter::decrement(*m_value);
+ }
+ SmartPointer& operator=(const SmartPointer& other)
+ {
+ SmartPointer temp(other);
+ temp.swap(*this);
+ return *this;
+ }
+ SmartPointer& operator=(Type* value)
+ {
+ SmartPointer temp(value);
+ temp.swap(*this);
+ return *this;
+ }
+ void swap(SmartPointer& other)
+ {
+ std::swap(m_value, other.m_value);
+ }
+
+ operator Type*() const
+ {
+ return m_value;
+ }
+ Type& operator*() const
+ {
+ return *m_value;
+ }
+ Type* operator->() const
+ {
+ return m_value;
+ }
+ Type* get() const
+ {
+ return m_value;
+ }
+};
+
+template<typename Type>
+inline bool operator<(const SmartPointer<Type>& self, const SmartPointer<Type>& other)
+{
+ return self.get() < other.get();
+}
+template<typename Type>
+inline bool operator==(const SmartPointer<Type>& self, const SmartPointer<Type>& other)
+{
+ return self.get() == other.get();
+}
+template<typename Type>
+inline bool operator!=(const SmartPointer<Type>& self, const SmartPointer<Type>& other)
+{
+ return !::operator==(self, other);
+}
+
+namespace std
+{
+ /// \brief Swaps the values of \p self and \p other.
+ /// Overloads std::swap().
+ template<typename Type>
+ inline void swap(SmartPointer<Type>& self, SmartPointer<Type>& other)
+ {
+ self.swap(other);
+ }
+}
+
+
+/// \brief A smart-reference that uses a counter stored in the object pointed-to.
+template<typename Type, typename Counter = IncRefDecRefCounter<Type> >
+class SmartReference : public Counter
+{
+ Type* m_value;
+public:
+
+ SmartReference(const SmartReference& other)
+ : m_value(other.m_value)
+ {
+ Counter::increment(*m_value);
+ }
+ explicit SmartReference(Type& value)
+ : m_value(&value)
+ {
+ Counter::increment(*m_value);
+ }
+ ~SmartReference()
+ {
+ Counter::decrement(*m_value);
+ }
+ SmartReference& operator=(const SmartReference& other)
+ {
+ SmartReference temp(other);
+ temp.swap(*this);
+ return *this;
+ }
+ SmartReference& operator=(Type& value)
+ {
+ SmartReference temp(value);
+ temp.swap(*this);
+ return *this;
+ }
+ void swap(SmartReference& other)
+ {
+ std::swap(m_value, other.m_value);
+ }
+
+ operator Type&() const
+ {
+ return *m_value;
+ }
+ Type& get() const
+ {
+ return *m_value;
+ }
+ Type* get_pointer() const
+ {
+ return m_value;
+ }
+};
+
+template<typename Type>
+inline bool operator<(const SmartReference<Type>& self, const SmartReference<Type>& other)
+{
+ return self.get() < other.get();
+}
+template<typename Type>
+inline bool operator==(const SmartReference<Type>& self, const SmartReference<Type>& other)
+{
+ return self.get() == other.get();
+}
+template<typename Type>
+inline bool operator!=(const SmartReference<Type>& self, const SmartReference<Type>& other)
+{
+ return !::operator==(self, other);
+}
+
+namespace std
+{
+ /// \brief Swaps the values of \p self and \p other.
+ /// Overloads std::swap().
+ template<typename Type>
+ inline void swap(SmartReference<Type>& self, SmartReference<Type>& other)
+ {
+ self.swap(other);
+ }
+}
+
+#endif