[Interest] QDirIterator as Variable in class

[Adrian Stern]

Hello

I want to iterate trough a directory one step at a time. Driven by signals.
So after each signal I want to do another step.

I have createt the following class in which I try to create a variable of  the 
type of QDirIterator. This however fails with the message no matching function 
for call to 0QDirIterator::QDirIterator()' in the constructor.

If I comment out the mediaItr variable declaration, it works without error. So 
what is it I'm doing wrong? A assume its something due to my .NET background so 
I don't see the whole cpp scope yet.

Class.h:
class MediaBase : public QObject
{
  Q_OBJECT

  QObject *player;
  QDir mediaDir;
  QDirIterator mediaItr;

public:
  explicit MediaBase(QObject *parent = 0);
  void setPlayer (QObject *player = 0);
  void setMediaDir (QString path);

private:
  QVariant getNext();

signals:

public slots:
  void movieStopped() {
if (player!=NULL) player-setProperty(thesource, getNext());
  }
};

Class.cpp:
MediaBase::MediaBase(QObject *parent) : QObject(parent) {
  QDirIterator mediaItr();
}

void MediaBase::setPlayer(QObject *player) {
  this-player = player;
}

void MediaBase::setMediaDir (QString path) {
  mediaDir = QDir(path);
  if (mediaDir.exists()){
//this-mediaItr = QDirIterator(mediaDir);
  }
  else qDebug()  could not load mediaDir  endl;
}

QVariant MediaBase::getNext(){
  return QVariant();
}


Freundliche Grüsse / Best Regards / Meilleures salutations
Adrian Stern

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Re: [Interest] QDirIterator as Variable in class

[Giuseppe D'Angelo]

Il 23/04/2013 14:12, Adrian Stern ha scritto:
 
  MediaBase::MediaBase(QObject *parent) : QObject(parent) {

Error 1, straight from the compiler: since you're not calling a 
QDirIterator constructor in your constructor's initializer list for the 
mediaItr data member variable, the compiler calls the default 
constructor. But QDirIterator lacks a default constructor. Therefore, 
you got an error

QDirIterator mediaItr();

Error 2, much more subtle: this is declaring a function called mediaItr, 
taking no arguments, returning a QDirIterator, and shadowing the member 
variable of the same name. (Yes, it's the C++ most vexing parse.) I know 
why you did this, but this is nonsense. Just remove it.

Note: I'm deliberately NOT writing the solution because I'd like to 
encourage you to search the web for all the keywords I used 
(initializer list, member, default constructor, most vexing 
parse). This is a C++ problem, not a Qt one.

HTH,
-- 
Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Software Engineer
KDAB (UK) Ltd., a KDAB Group company
Tel. UK +44-1738-450410, Sweden (HQ) +46-563-540090
KDAB - Qt Experts - Platform-independent software solutions
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