Creating and Maintaining dynamic array of QLists - How to?

[darthana]

Need to maintain multiple QLists. QLists to be created based on need and the pointers to the QLists are to be maintained as a dynamic array. So that an QList element can be pushed or popped based on need.

Is it possible to maintain a dynamic array of QList?
QList<MyClass*> * m_pMyClass;
QVector<m_pMyClass> MyClassArray;

So based on need, create a m_pMyClass = new QList<MyClass*>; and push it to MyClassArray?

Note: Just a beginner. Not so good with syntax

[jsulm]

@darthana said in Creating and Maintaining dynamic array of QLists - How to?:

Is it possible to maintain a dynamic array of QList?

Yes, it is.
"QVector<m_pMyClass> MyClassArray;" - this is invalid C++ because m_pMyClass is a variable, not a type.

What you need is:

QVector<QList<MyClass*>> MyClassArray;

To add a new QList to MyClassArray:

MyClassArray.append(new QList<MyClass*>());

[JonB]

@darthana
Just so you know, you can also maintain a list of lists rather than an array/vector if you wish:

QList<QList<MyClass*>> MyClassList;

There is not much difference between a QList and a QVector, especially if you are at Qt6.

[darthana]

@jsulm @JonB Thanks!!! Will update you on my progress :)

[darthana]

@jsulm @JonB

I have created a QList<QList<MyClass*>> MyClassList;
Just struggling to keep going.

Consider I need to create multiple instances of MyClass and store it in a QList.
Also need to create multiple QLists mentioned above and store them in MyClassList.

How can I access a particular instance of MyClass from MyClassList? I understand a selection of QList inside MyClassList has to be done but not sure on syntax

[mpergand]

@darthana
See my post HERE

[JoeCFD]

@JonB Just noticed that QVector simply inherits QList in Qt6 and does not have a single extra definition.
https://doc.qt.io/qt-6/qvector.html#details
std::list and std::vector have quite some differences.

[JonB]

@JoeCFD said in Creating and Maintaining dynamic array of QLists - How to?:

@JonB Just noticed that QVector simply inherits QList in Qt6 and does not have a single extra definition.

That's why I wrote:

There is not much difference between a QList and a QVector, especially if you are at Qt6.

They essentially made them the same at Qt6.

[JoeCFD]

@JonB True. That is kind of confusing. I prefer to use std::vector and std::list.

[JonB]

@JoeCFD
Fine and up to you, but then you/beginners will have to do conversions between std:: lists/vectors and Qt ones.