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On Wednesday, 17. October 2007 11:51:39 Thomas Zander wrote:
> 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.

It also takes a d-pointer, but which is not shared generally (the shared=20
pointer is part of the union in the private. Don't know what trick hides=20
behind this. Sharing only if necessary or only complex types?)

> 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.

You're refering to the d-pointer you missed for QVariant. Not because of th=
at,=20
but maybe it takes more, due to the fact, that Value always shares the data=
,=20
a QAtomic (an integer?) is always occupied.

A quick check gives me (AMD64):
kspread(17556) KSpread::Value::Value: sizeof(QVariant)=3D 16
kspread(17556) KSpread::Value::Value: sizeof(QVariant::Private)=3D 16
kspread(17556) KSpread::Value::Value: sizeof(Value)=3D 16
kspread(17556) KSpread::Value::Value: sizeof(Value::Private)=3D 16

Either way, if you think, it's worth the effort for whatever reason go ahea=
d.=20
I don't mind.

> On
> the other hand, I have some faith in the hackers-capabilities of the Trol=
ls
> ;)

Hmm, knowing one of the new trolls I'm not so sure about that statement; ;)

=2D-=20
Regards,
Stefan

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