oop_istypeof.c

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/* is operator */

#include "fb.h"

FBCALL int fb_IsTypeOf( FB_OBJECT *obj, FB_RTTI *typeRTTI )
{
        if( obj == NULL )
                return FB_FALSE;
        
        FB_RTTI *objRTTI = ((FB_BASEVT *)(((unsigned char *)obj->pVT) - sizeof( FB_BASEVT )))->pRTTI;
        while( objRTTI != NULL )
        {       
                /* note: can't compare just the address because object or type could be declared in a DLL */
                if( strcmp( objRTTI->id, typeRTTI->id ) == 0 ) 
                        return FB_TRUE;
                        
                objRTTI = objRTTI->pRTTIBase;
        }
        
        return FB_FALSE;
}