138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_TYPESYSTEM_H )
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#define INCLUDED_TYPESYSTEM_H
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#include <list>
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#include <vector>
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#include "generic/callback.h"
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#include "generic/static.h"
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class InitialiserList
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{
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typedef std::list<Callback<void ()> > Initialisers;
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Initialisers m_initialisers;
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mutable bool m_initialised;
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public:
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InitialiserList() : m_initialised( false ){
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}
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void addInitialiser( const Callback<void()>& callback ){
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m_initialisers.push_back( callback );
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}
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void initialise() const {
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if ( !m_initialised ) {
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m_initialised = true;
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for ( Initialisers::const_iterator i = m_initialisers.begin(); i != m_initialisers.end(); ++i )
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{
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( *i )( );
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}
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}
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}
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};
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//--Type System-------------------
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class TypeSystemInitialiser : public InitialiserList
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{
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};
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typedef SmartStatic<TypeSystemInitialiser> StaticTypeSystemInitialiser;
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class TypeSystemRef : public StaticTypeSystemInitialiser
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{
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public:
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TypeSystemRef(){
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StaticTypeSystemInitialiser::instance().initialise();
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}
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};
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typedef std::size_t TypeId;
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typedef void*( *TypeCast )( void* );
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template<std::size_t SIZE>
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class TypeCastTable
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{
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TypeCast m_casts[SIZE];
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public:
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TypeCastTable(){
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std::uninitialized_fill( m_casts, m_casts + SIZE, TypeCast( 0 ) );
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}
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void install( TypeId typeId, TypeCast typeCast ){
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m_casts[typeId] = typeCast;
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}
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void* cast( TypeId typeId, void* p ){
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TypeCast typeCast = m_casts[typeId];
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if ( typeCast != 0 ) {
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return typeCast( p );
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}
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return 0;
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}
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};
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template<typename Type, typename Cast>
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class CastInstaller
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{
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public:
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static void install( TypeCastTable<Type::SIZE>& table ){
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table.install( Type::getTypeId(), Cast::cast );
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}
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};
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template<typename Type>
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class IdentityCast
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{
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public:
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static void* cast( void* p ){
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return p;
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}
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};
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template<typename Type, typename Base>
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class StaticCast
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{
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public:
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static void* cast( void* p ){
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return static_cast<Base*>( reinterpret_cast<Type*>( p ) );
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}
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};
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template<typename Type>
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class NullType
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{
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};
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template<typename Type, typename Contained>
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class ContainedCast
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{
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public:
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static void* cast( void* p ){
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return &reinterpret_cast<Type*>( p )->get( NullType<Contained>() );
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}
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};
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#endif
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