The GtkRadiant sources as originally released under the GPL license.

libs/typesystem.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_TYPESYSTEM_H)
+#define INCLUDED_TYPESYSTEM_H
+
+
+#include <list>
+#include "generic/callback.h"
+#include "generic/static.h"
+
+class InitialiserList
+{
+  typedef std::list<Callback> Initialisers;
+  Initialisers m_initialisers;
+  mutable bool m_initialised;
+public:
+  InitialiserList() : m_initialised(false)
+  {
+  }
+  void addInitialiser(const Callback& callback)
+  {
+    m_initialisers.push_back(callback); 
+  }
+  void initialise() const
+  {
+    if(!m_initialised)
+    {
+      m_initialised = true;
+
+      for(Initialisers::const_iterator i = m_initialisers.begin(); i != m_initialisers.end(); ++i)
+      {
+        (*i)();
+      }
+    }
+  }
+};
+
+//--Type System-------------------
+
+class TypeSystemInitialiser : public InitialiserList
+{
+};
+
+typedef SmartStatic<TypeSystemInitialiser> StaticTypeSystemInitialiser;
+
+class TypeSystemRef : public StaticTypeSystemInitialiser
+{
+public:
+  TypeSystemRef()
+  {
+    StaticTypeSystemInitialiser::instance().initialise();
+  }
+};
+
+
+
+typedef std::size_t TypeId;
+typedef void*(*TypeCast)(void*);
+
+template<std::size_t SIZE>
+class TypeCastTable
+{
+  TypeCast m_casts[SIZE];
+public:
+  TypeCastTable()
+  {
+    std::uninitialized_fill(m_casts, m_casts + SIZE, TypeCast(0));
+  }
+  void install(TypeId typeId, TypeCast typeCast)
+  {
+    m_casts[typeId] = typeCast;
+  }
+  void* cast(TypeId typeId, void* p)
+  {
+    TypeCast typeCast = m_casts[typeId];
+    if(typeCast != 0)
+    {
+      return typeCast(p);
+    }
+    return 0;
+  }
+};
+
+template<typename Type, typename Cast>
+class CastInstaller
+{
+public:
+  static void install(TypeCastTable<Type::SIZE>& table)
+  {
+    table.install(Type::getTypeId(), Cast::cast);
+  }
+};
+
+template<typename Type>
+class IdentityCast
+{
+public:
+  static void* cast(void* p)
+  {
+    return p;
+  }
+};
+
+template<typename Type, typename Base>
+class StaticCast
+{
+public:
+  static void* cast(void* p)
+  {
+    return static_cast<Base*>(reinterpret_cast<Type*>(p));
+  }
+};
+
+template<typename Type>
+class NullType
+{
+};
+
+template<typename Type, typename Contained>
+class ContainedCast
+{
+public:
+  static void* cast(void* p)
+  {
+    return &reinterpret_cast<Type*>(p)->get(NullType<Contained>());
+  }
+};
+
+
+#endif