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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