[Interest] Smaller QString Serialization

[Thiago Macieira]

On Tuesday, 15 April 2025 01:32:56 Pacific Daylight Time Ivan Solovev via 
Interest wrote:
> > My primary question is: is there a way to avoid doing a copy for the utf8
> > data (the char *buffer in operator>> and the QByteArray utf8 in
> > operator<<)?
> 
> QString stores the data as UTF-16, so you won't be able to avoid a copy
> if you want to convert the data to/from UTF-8.
> 
> I didn't have a look at the implementation, but one thing to note is that
> IIUC defining your own serialization operators for QString would be
> an ODR violation. So, maybe you'd need to wrap QString into a custom
> struct first.

Or just not use QDataStream in the first place.

Using CBOR, strings are serialised as UTF-8 with a compressed size. Null-vs-
empty distinction is lost, though.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCAI Platform & System Engineering
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