RE: [GD-General] meaning of sizeof(int) on all plateform

[Phil T. <ph...@mi...>]

Actually pointer to member functions throw a wrench into this =
discussion, specifically when forward declaring classes.  There was a =
thread on this in the software engineering list.
=20
The example given was this:
=20
class C;
int (C::*pmf)();
C* p;
=20
int n =3D (p->*pmf)();
=20
Note that the full declaration of the class C is not required for this =
code to compile; however, the member function could be virtual/multiply =
inherited/etc so the pointer has to encode this information.
=20
On Win32 some compilers will generate this as a 16 byte pointer; others, =
will generate stub code and return a pointer to that code which is then =
a 4 byte pointer.  VC 7 has some compiler options that let you choose =
the behavior.
=20
The point being that there are things that look like pointers but that =
aren't the same size as other native pointers.
=20
Phil
=20

________________________________

From: gam...@li... on behalf of =
Daniel Vogel
Sent: Sat 28.06.2003 12:54
To: gam...@li...
Subject: RE: [GD-General] meaning of sizeof(int) on all plateform



> I state that sizeof(T*) is the same, whatever T might be. Am I wrong?

I'm not aware of any implementation where this is not the case though
the standard doesn't guarantee it.

-- Daniel, Epic Games Inc.



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