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/*
* CENA C++ Utilities
*
* by Stephane Chatty
*
* Copyright 1991, 1992
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* metaclasses, originally by Michel Beaudouin-Lafon
*
* $Id$
* $CurLog$
*/
#ifndef _MetaClass_H_
#define _MetaClass_H_
#include "List.h"
class MetaClass {
protected:
const char* Name;
IvlListOf <MetaClass> BaseClasses;
public:
MetaClass (const char*, MetaClass&);
MetaClass (const char*);
inline MetaClass* GetBaseClass () const { return BaseClass; }
inline const char* GetName () const { return Name; }
inline operator const char* () const { return Name; }
inline int IsBase () const { return (BaseClass == 0); }
inline int IsDerived () const { return (BaseClass != 0); }
int IsSubClassOf (const MetaClass&) const;
int IsSubClassOf (const char*) const;
inline int operator <= (const MetaClass& c) const { return IsSubClassOf (c); }
inline int operator >= (const MetaClass& c) const { return c.IsSubClassOf (*this); }
inline int operator < (const MetaClass& c) const { return (this != &c) && IsSubClassOf (c);}
inline int operator > (const MetaClass& c) const { return (this != &c) && c.IsSubClassOf (*this); }
inline int operator == (const MetaClass& c) const { return (this == &c); }
inline int operator != (const MetaClass& c) const { return (this != &c); }
inline const MetaClass& operator = (const MetaClass&) const { return *this; }
};
#ifdef __GNUG__
#define _nameCLASS(a) #a
#else
#define _nameCLASS(a) "a"
#endif
/*** should we have two macros for headers (with/without virtual) ***/
#define MetaclassHeader \
public: \
static MetaClass TheClass; \
virtual MetaClass& Class () const; \
private:
#define BaseMetaclassBody(name) \
MetaClass name::CLASS (_nameCLASS(name)); \
\
MetaClass& \
name :: Class () const \
{ \
return CLASS; \
}
#define DerivedMetaclassBody(name,base) \
MetaClass name::CLASS (_nameCLASS(name),&base::CLASS);\
\
MetaClass& \
name :: Class () const \
{ \
return CLASS; \
}
#define NarrowMembers(derived,base) \
static inline derived* Narrow (base* p) { if (p && p->Class () <= CLASS) return (derived*) p; else return 0; } \
static inline const derived* Narrow (const base* p) { if (p && p->Class () <= CLASS) return (const derived*) p; else return 0; } \
static inline derived& Narrow (base& p) { return * Narrow (&p); } \
static inline const derived& Narrow (const base& p) { return * Narrow (&p); }
#endif
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