[Development] QStringRef conversion functions

[aaron.kennedy at nokia.com]

Hi,

On 13/06/2012, at 7:36 PM, ext Thiago Macieira wrote:

> On quarta-feira, 13 de junho de 2012 18.14.59, aaron.kennedy at nokia.com wrote:
>> Won't a QString always require an allocation for the d-ptr?  So it'll never
>> be quite as cheap as QStringRef.
> 
> Not exactly.
> 
> A QStringRef points to an existing QString. Therefore, if we take a QString 
> that is pointing to a substring of an existing QString, the d-ptr is already 
> allocated. The new QString would be as cheap as the current QStringRef.

How does that work?  Where do you store the substring's offset and length data?

Cheers,

Aaron

> 
> The issue we'll run into is that a substring could be "holding hostage" a huge 
> chunk of memory.
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
>     Intel Sweden AB - Registration Number: 556189-6027
>     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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