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List:       koffice-devel
Subject:    Re: Proposal to replace Value by QVariant (Re: koffice/kspread)
From:       Thomas Zander <zander () kde ! org>
Date:       2007-10-17 9:51:39
Message-ID: 200710171151.42531.zander () kde ! org
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On Wednesday 17 October 2007 11:12:54 Stefan Nikolaus wrote:
> KSpread::Value is used a lot and the last time I've checked it was more
> lightweight as QVariant.

Hmm, reading the source code I'm not so sure about that statement;

QVariant takes 32 bits plus one pointer (32 or 64 bits depending on 
architecture).
32 bits as members, and the pointer in the union.

KSpread::Value takes one (d)pointer, 8 bits and another pointer.
the dpointer is QSharedDataPointer<Private> d;
8 bits as members, and the pointer in the union.

This means that the kspread one takes more memory then the qvariant one, upto 
8 bytes more.

This is pretty low level, so I might be wrong as this is not my forte. On the 
other hand, I have some faith in the hackers-capabilities of the Trolls ;)
-- 
Thomas Zander

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