[Interest] QList operator[]

[Brad Pepers]

Ah I see...  So it's the const-ness of the object itself and not the reference that is controlling which operator[] gets used.  That makes sense to me now.

I'm still not sure what is happening with all that memory though.  I'm asking for a reference so I don't expect that I own what is returned yet it seems to be making a deep copy each time and not freeing that memory since in seconds the memory use of the process sky-rockets until the whole system starts thrashing and eventually crashes and burns.  Seems odd behaviour to get from a couple of lines of code like that.  Would never have expected that to be a memory leak!  Makes me wonder if I've done the same kind of mistake in other places where it's not so noticeable...

--
Brad


On Jan 09, 2015, at 01:21 PM, Keith Gardner <kreios4004 at gmail.com> wrote:

QList can return a const & with the [] operator [1]. The documantation even says it's the same as .at().

[1] http://doc.qt.io/qt-5/qlist.html#operator-5b-5d-2

That is true if the QList is const when calling the function.  If it is not, the other operator [1] documentation describes the behavior.

[1] http://doc.qt.io/qt-5/qlist.html#operator-5b-5d 
 
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