[Qt-interest] Pointer issue

[Konrad Rosenbaum]

On Wednesday 25 February 2009, Zine eddine Bendjaballah wrote:
> I've a class called "Subject" in my project.
>

> And an other class called SubjectModel;
>
> class SubjectModel: public QAbstractTableModel
> {
>    Q_OBJECT
>
>    public:
>        //Public declarations
>       ...
>    private:
>        QList <Subject*> subjects ;
> };

> My program crashes when it arrive at this instruction:
>
> if (subjects[i]->name == initialSubjectName)

Why not use QList<Subject> instead? According to the code you've shown it 
should not be too expensive to copy it (QStrings are implicitly shared and 
QColor is really small). This would save you all the headaches of pointer 
operation.

Or at the very least declare it as QList<QPointer<Subject> > and check 
subjects[i].isNull() before you use the pointer.


	Konrad


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