Qt QObject动态数组

Question

Is there a different way to create a dynamic array of QObject? The following code would not compile:

QStringList labels = defaultScene->getLabels();
QAction* traceActions = new QAction[labels.size()];

The error is:

C2512: 'QAction' : no appropriate default constructor available

Answer 1

You're seeing this because QAction doesn't have a default constructor.

You could create an array of pointers to QAction and then instantiate each QAction on it's own.

Something roughly like:

QAction** actions = new (QAction*)[labels.size()];
for(size_t i = 0; i<labels.size(); ++i)
{
  actions[i] = new QAction(constructor params ...);
}