RE: [Mingw-users] dlls and classes

[Weiqi G. <wei...@ne...>]

Oscar Fuentes wrote:
> 
> Weiqi Gao wrote:
> > 
> > And all compilers do the pointer manipulation the same way,
> 
> Have you checked this?

No.  I was rephrasing Charles Kindel, who said:
> 
> The core of COM is the specification of the binary, in-memory layout,
of an
> interface vtable. The layout COM uses just happens to be the same
layout
> that all popular C++ compilers use for their C++ vtable layouts.  In
C, you
> just build one of these vtables yourself by allocating a chunk of
memory
> and filling it in with function pointers.

I should have qualified the compilers to "all popular C++ compilers on
Windows in 1996".

> My experience shows evidency that 
> supports the opposite claim. The virtual call mechanism is 
> implementor-defined and each vendor seems to have its own 
> ideas about how to implement it.

And when dealing with such compilers the trick which is the topic of
this thread won't work.

--
Weiqi Gao
wei...@ne...