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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
*
* $Id$
* $CurLog$
*/
#include "MetaClass.h"
#include <string.h>
/*?class MetaClass
This class provides minimal support for metaclasses in C++.
A \typ{MetaClass} object represents a C++ class.
It contains a name (a string holding the name of the C++ class), and the inheritance information.
Multiple inheritance is not supported in this version.
?*/
/*
a discuter :
autres fonctions dans MetaClass, notamment pour le transport d'objet
stocker dans l'objet MetaClass la fonction de chargement/ecriture
mettre les MetaClass dans une h-table indexee par le nom
persistance: la description des classes pour la sauvegarde/chargement pourrait etre
non pas dans le code, mais dans un fichier (par exemple le .h !!!)
faut-il conserver la liste des classes filles ?
*/
/*?
Create a metaclass for the base class named \var{n}.
?*/
MetaClass :: MetaClass (const char* n)
: Name (n),
BaseClasses ()
{
}
/*?
Create a metaclass for the derived class named \var{n}.
\var{s} is the metaclass of the base class of the class named \var{n}.
?*/
MetaClass :: MetaClass (const char* n, MetaClass& s)
: Name (n),
BaseClasses ()
{
BaseClasses->Append (s);
}
/*?
Return true if this metaclass is a derived class of the metaclass s.
?*/
int
MetaClass :: IsDerivedClass (const MetaClass& s) const
{
register const MetaClass* m = this;
do {
if (m == &s)
return 1;
} while (m = m->BaseClass);
return 0;
}
/*?
Return 1 if this metaclass is a derived class of the metaclass named \var{n}.
This form is less efficient than the previous one.
It may be useful to avoid including the definition of the class named \var{n}.
?*/
int
MetaClass :: IsSubClass (const char* n) const
{
register const MetaClass* m = this;
do {
if (strcmp (m->name, n) == 0)
return 1;
} while (m = m->BaseClass);
return 0;
}
#ifdef DOC
// fake entries for documentation
/*?
Return the superClass of this metaclass.
Note that base classe have MetaClass::ROOT as superClass.
MetaClass::ROOT is its own metaclass
(there is a loop at the root of the inheritance tree).
?*/
MetaClass&
MetaClass :: SuperClass () const
{
}
/*?
Return the name of this metaclass.
By convention, it is identical to the identifier for the class represented by this metaclass.
?*/
const char*
MetaClass :: Name () const
{
}
/*?
This conversion operator returns the name of this metaclass.
See the member function Name.
?*/
MetaClass :: operator const char* () const
{
}
/*?nextdoc?*/
int
MetaClass :: Base () const
{
}
/*?
Return true if the class represented by this metaclass
is a base class (resp. a derived class).
?*/
int
MetaClass :: Derived () const
{
}
/*?
Return 0 if this metaclass is MetaClass::ROOT, else return 1.
This makes it easy to walk up the hierarchy of metaclasses:\\
\hspace*{1cm}\com{while (mc = mc.SuperClass ()) ...}.
?*/
MetaClass :: operator int () const
{
}
/*?nextdoc?*/
int
MetaClass :: operator <= (const MetaClass& c) const
{
}
/*?nextdoc?*/
int
MetaClass :: operator >= (const MetaClass& c) const
{
}
/*?nextdoc?*/
int
MetaClass :: operator < (const MetaClass& c) const
{
}
/*?nextdoc?*/
int
MetaClass :: operator > (const MetaClass& c) const
{
}
/*?nextdoc?*/
int
MetaClass :: operator == (const MetaClass& c) const
{
}
/*?
Relational operations between metaclasses.
The metaclass of class A is $<$ to the metaclass of class B
if A is a derived class of B.
The definitions of the other operators derive from this one.
Note however that the order between metaclasses is not total :
two metaclasses A and B can be uncomparable, that is
neither A $<$ B or B $<$ A is true.
This is the case when A does not derive from B and B does not derive from A.
?*/
int
MetaClass :: operator != (const MetaClass& c) const
{
}
/*?nodoc?*/
const MetaClass&
MetaClass :: operator = (const MetaClass&)
{
}
#endif
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