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Top Forums Programming Sharing C++ Objects with virtual function table pointers Post 13818 by Seeker on Thursday 24th of January 2002 01:14:24 AM
Old 01-24-2002
Question Sharing C++ Objects with virtual function table pointers

I am pondering the next question:
Can I safely sare objects that have virtual functions (i.e. have
virtual function table pointers) between two processes ?
Where will the pointers point to in each process ?
What I am afraid of is that in the creating process the pointer
will indeed point to the virtual function table, but in the
sharing process that pointer will point at junk.

Smilie
Can anyone calm me or maybe confirm my fears ?

Thank you !
 

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ost::BaseObject(3)					     Library Functions Manual						ost::BaseObject(3)

NAME
ost::BaseObject - BaseObject. SYNOPSIS
#include <persist.h> Public Member Functions BaseObject () This constructor is used in serialisation processes. virtual ~BaseObject () Default destructor. virtual const char * getPersistenceID () const This returns the ID of the persistent object (Its type) virtual bool write (Engine &archive) const This method is used to write to the Persistence::Engine It is not equivalent to the << operator as it writes only the data and not the object type etc. virtual bool read (Engine &archive) This method is used to read from a Persistence::Engine It is not equivalent to the >> operator as it does no typesafety or anything. Detailed Description BaseObject. This object is the base for all Persistent data which is not natively serialised by the Persistence::Engine It registers itself with the Persistence::TypeManager using a global constructor function. A matching deregister call is made in a global destructor, to allow DLL's to use the Persistence::Engine in a main executable. Persistable objects must never maintain bad pointers. If a pointer doesn't point to something valid, it must be NULL. This is so the persistence engine knows whether to allocate memory for an object or whether the memory has been pre-allocated. Author: Daniel Silverstone Base class for classes that will be persistent. Constructor &; Destructor Documentation ost::BaseObject::BaseObject () This constructor is used in serialisation processes. It is called in CreateNewInstance in order to create an instance of the class to have Read() called on it. virtual ost::BaseObject::~BaseObject () [virtual] Default destructor. Member Function Documentation virtual const char* ost::BaseObject::getPersistenceID () const [virtual] This returns the ID of the persistent object (Its type) virtual bool ost::BaseObject::read (Engine &archive) [virtual] This method is used to read from a Persistence::Engine It is not equivalent to the >> operator as it does no typesafety or anything. virtual bool ost::BaseObject::write (Engine &archive) const [virtual] This method is used to write to the Persistence::Engine It is not equivalent to the << operator as it writes only the data and not the object type etc. Author Generated automatically by Doxygen for GNU CommonC++ from the source code. GNU CommonC++ Sat Jun 23 2012 ost::BaseObject(3)
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