The GtkRadiant sources as originally released under the GPL license.

libs/generic/referencecounted.h

@@ -0,0 +1,207 @@
+/*
+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