[Interest] Help, please !!!

[Scott Aron Bloom]

Be careful with 
List->append( &someOtherList );

If someOtherList goes out of scope, you will be pointing to a deleted list.

Since QList uses implicit sharing, the cost of removing the inner pointer isn't that much.

QList< QList< int > > 

Is much safer

Scott



-----Original Message-----
From: interest-bounces+scott.bloom=onshorecs.com at qt-project.org [mailto:interest-bounces+scott.bloom=onshorecs.com at qt-project.org] On Behalf Of Nikos Chantziaras
Sent: Monday, April 23, 2012 10:34 AM
To: interest at qt-project.org
Subject: Re: [Interest] Help, please !!!

On 23/04/12 20:17, Miguel Milán Isaac wrote:
> I need to use QList<QList<int>  *>  * list; but I do not know how to 
> initialize it.
>
> I want to do something like this:
> if (! listRemoved->  at (pos) ->  contains (id)) {
>       //do something
> }

   QList< QList<int>* >* list = new QList< QList<int>* >;

   // Fill it with 10 elements.
   for (int i = 0; i < 10; ++i) {
       list->append(new QList<int>);
       // Or:
       // list->append(&someOtherList);
   }

Now every list[i] (or list->at(i)) gives you a QList<int>*.  For example:

   if (!list->at(pos)->contains(id)) {
       // Do something.
   }

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