Use Q_GLOBAL_STATIC where K_GLOBAL_STATIC is not needed?

Michael Pyne mpyne at
Thu Feb 10 22:11:42 GMT 2011

On Thursday, February 10, 2011 16:35:20 Stephen Kelly wrote:
> Thiago Macieira wrote:
> > On Thursday, 10 de February de 2011 21:08:05 Stephen Kelly wrote:
> >> Thiago Macieira wrote:
> >> > It should have been in a qglobalstatic_p.h. We might even do that --
> >> > and intentionally break applications that are abusing the API.
> >> 
> >> A quick grep says that would break akonadi, grantlee, qca, phonon, qxt
> >> and a couple of places in KDE that use it already (presumably they don't
> >> need the features of K_GLOBAL_STATIC that you mentioned). If you
> >> (re)move it, we'd all just end up copying the macro into our own
> >> codebases, so that wouldn't achieve much.
> > 
> > Phonon should have a copy of K_GLOBAL_STATIC.
> I noticed K_GLOBAL_STATIC uses QBasicAtomicPointer, which doesn't seem to
> be public API. Is that going away too? That would break K_GLOBAL_STATIC.

Although you raise a good point, their docs are quite clear that the API is 
not public, so pointing out *other* uses of non-public APIs doesn't really 
help the argument, as Nokia is still within their rights to move non-public 
API to non-installed headers.

I say this as someone who uses QAtomicInt assuming a mode of operation that is 
not explicitly documented (i.e. it is safe to initialize its memory with 0 and 
avoid running the ctor). If Nokia changes it I would grumble, but it would by 
my problem, not theirs.

It also wouldn't really break K_GLOBAL_STATIC, as the code could simply be 
"freed" from Qt in the event that were to happen, or be reimplemented in a 
different fashion (such as gcc intrinsics, I would imagine).

 - Michael Pyne
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