left versus leftRef

[Mucip]

Hi,
I just use Analyze tool on Win10 called "Clang-Tidy and Clazy" and I realized leftRef or midRef commands.

Normaly I was using left or mid only. But Analyze gave report use midRef/leftRef instead of mid/left.

I looked the documention and everything and the results are same both version.
Well, what is the diffrerence of mid vs midRef or left vs.leftRef for Analyze tool?

Regards,
Mukcip:)

[SGaist]

Hi,

No allocation in the case of the Ref version. They point directly on the QString content.

[Mucip]

Hi @SGaist ,
Ok. Thanks. This mean that Ref version doesn't need memory allocation?

Regards,
Mucip:)

[SGaist]

Only the thin wrapper QStringRef, not a full QString with the data copied in there.

[JKSH]

Note: QStringRef is deprecated in Qt 6. It is moved to a "Qt 5 compatibility" module and will be removed from Qt 7: https://doc-snapshots.qt.io/qt6-dev/qstringref.html

[Mucip]

Hi @JKSH ,
This is bad news. So I MUST NOT use ref versions? :(

Regards,
Mucip:)

[JKSH]

@Mucip said in left versus leftRef:

So I MUST NOT use ref versions? :(

Usually, there is no need to use the ref versions.

What is your goal? Perhaps there are other ways to achieve your goal without using midRef()/leftRef()

[Mucip]

@JKSH said in left versus leftRef:

Usually, there is no need to use the ref versions.
What is your goal? Perhaps there are other ways to achieve your goal without using midRef()/leftRef()

As I said in my firs post. I already achieve my goal while using mid or left. But Analyzer suggest me to use Ref version.
Anyway. I can cancel "use Ref" suggestion. :)

Regards,
Mucip:)

[SGaist]

You can already follow the new way by using QStringView like shown here.