The GtkRadiant sources as originally released under the GPL license.

libs/generic/enumeration.h

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+/*
+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_ENUMERATION_H)
+#define INCLUDED_GENERIC_ENUMERATION_H
+
+/// \file
+/// \brief Type safe enumeration.
+
+/// \brief An enumerated value.
+///
+/// - Can be forward-declared when the definition of Enumeration is unknown.
+/// - Can only be constructed from valid enumerated values.
+/// - Can only be compared with others of the same type.
+///
+/// \param Enumeration A type that contains an enum \c Value of the allowed values of the enumeration.
+template<typename Enumeration>
+class EnumeratedValue : public Enumeration
+{
+  typename Enumeration::Value m_value;
+public:
+  explicit EnumeratedValue(typename Enumeration::Value value) : m_value(value)
+  {
+  }
+  typename Enumeration::Value get() const
+  {
+    return m_value;
+  }
+};
+
+template<typename Enumeration>
+inline bool operator==(EnumeratedValue<Enumeration> self, EnumeratedValue<Enumeration> other)
+{
+  return self.get() == other.get();
+}
+template<typename Enumeration>
+inline bool operator!=(EnumeratedValue<Enumeration> self, EnumeratedValue<Enumeration> other)
+{
+  return !operator==(self, other);
+}
+
+#endif