API problems (Was: future versions)

[Marc Mutz]

On Saturday 07 February 2004 12:18, Friedrich W. H.  Kossebau wrote:
<snip>
> But is this really memory intensive? Please, can you correct me or
> give some numbers?
<snip>

Run attached program, which is slightly adapted (and fixed) from Volume 
2 of Thinking in C++.

No, it's not eating megabytes of memory. But it's still more then you'd 
expect if you didn't think it through. After all, all the classes there 
have the same payload of a single int (4 bytes here), and the virtual 
inheritance makes sure that there's only _one_ MBase object even in MI.

Now, of course OQbject is ~40 bytes and so the 40 bytes from ten 
implemented interfaces is not nearly that dramatic as in the simple 
example, but I'd still consider this surprisingly memory intensive.

_I_ was surprised, at least.

Marc

-- 
If free-software authors lose the right to disclaim all warranties and
find themselves getting sued over the performance of the programs
they've written, they'll stop contributing free software to the world.
 -- Bruce Perens: Open Sources: Voices from the Open Source Revolution
-------------- next part --------------
A non-text attachment was scrubbed...
Name: virtual-inheritance.cpp
Type: text/x-c++src
Size: 886 bytes
Desc: not available
URL: <http://mail.kde.org/pipermail/kde-core-devel/attachments/20040208/70c7abd4/attachment.cpp>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
URL: <http://mail.kde.org/pipermail/kde-core-devel/attachments/20040208/70c7abd4/attachment.sig>