Hi,
Op 03/05/2017 om 20:15 schreef Jason H:
>
>> Sent: Wednesday, May 03, 2017 at 1:53 PM
>> From: "Konstantin Shegunov"
>> To: "Jason H"
>> Cc: "Qt Project"
>> Subject: Re: [Interest] QVectors vs QLists
>>
>> I&#
Il 03/05/2017 20:15, Jason H ha scritto:
My calls to keys() are few, but they happen on large datasets.
It sounds like I should just use QLists for keys() until Qt6.
What's the key type? You mentioned qreal, QVector3D, etc.; those are
terrible types for QList.
Cheers,
--
Giuseppe D'Angelo |
03.05.2017, 21:09, "Sean Harmer" :
> Hi,
>
> On 03/05/2017 17:57, Jason H wrote:
>> I have a app that does a lot of numeric processing,using quint32, qreal
>> mostly (and occasional QVector3D). 10k-1M items in the data set. I generally
>> do know the size of the dataset before I start adding t
> Sent: Wednesday, May 03, 2017 at 1:53 PM
> From: "Konstantin Shegunov"
> To: "Jason H"
> Cc: "Qt Project"
> Subject: Re: [Interest] QVectors vs QLists
>
> I'll throw my 2 cents in, in addition to Sergio's comment on
> ite
Hi,
On 03/05/2017 17:57, Jason H wrote:
I have a app that does a lot of numeric processing,using quint32, qreal mostly
(and occasional QVector3D). 10k-1M items in the data set. I generally do know
the size of the dataset before I start adding to it, so I call reserve() on it.
Given that, and
I'll throw my 2 cents in, in addition to Sergio's comment on
iterator-based traversing.
1) If you don't absolutely need key ordering, I'd suggest a hash table
(e.g. QHash) due to the amortized time lookup/insertion. If you use a
numerical key for the QMap, I'd definitely consider switching to a
ha
On 2017-05-03 17:57, Jason H wrote:
I have a app that does a lot of numeric processing,using quint32,
qreal mostly (and occasional QVector3D). 10k-1M items in the data set.
I generally do know the size of the dataset before I start adding to
it, so I call reserve() on it. Given that, and that I'v
I have a app that does a lot of numeric processing,using quint32, qreal mostly
(and occasional QVector3D). 10k-1M items in the data set. I generally do know
the size of the dataset before I start adding to it, so I call reserve() on it.
Given that, and that I've been using QMap and QVector, when
