[Qt-creator] gdb Debugg Helpers - typedef bug

[André Pönitz]

On Sunday 19 July 2009 20:54:33 ext Robert Caldecott wrote:
> I think this may of been posted before but if you typedef a QMap,
> QList, etc. you cannot view the contents with the debugging helpers,
> e.g.:
> 
> #include <QtCore/QCoreApplication>
> #include <QMap>
> #include <QString>
> #include <QListv
> 
> int main(int argc, char *argv[])
> {
>  QCoreApplication a(argc, argv);
>  QMap<QString, QString> map1;
>  map1["Hello"] = "World!";
> 
>  typedef QMap<QString, QString> Map;
>  Map map2;
>  map2["Hello"] = "World!";
> 
>  QList<int> list1;
>  list1.append(1234);
> 
>  typedef <int> List;
>  List list2;
>  list2.append(1234);
>  return a.exec();
> }
> 
> map1 and list1 are fine, map2 and list2 won;t display.  I am on the
> latest 1.2.1 on XP SP3.

That's closer to a missing feature than to a bug, at least not in Creator.

The type reported by gdb is 'List'. I could resolve this to 'QList<int>'
'manually', However, doing so would generally impact the debugging
helper performance as this would need an additional roundtrip for
each item in the Locals&Watchers view (and an roundtrip takes
several dozen milliseconds even on fast machines, so we are talking
about slowing down each 'step' by a second or so.)

You can get a 'nice' display of list2 'manually' by creating a 'Watcher'
with expression   *('QList<int>'*)&list2  .

I understand this is neither obvious nor convenient, but I am also
a bit afraid of the general slowdown.

So for now I am tempted to leave it as it is.

Andre'