Trouble with QVariant setValue() and Q_DECLARE_METATYPE

[tgoetz]

I have a small class describing an object which I want to use in a QAbstractItemModel. It's not derived from anything, has a copy and a default constructor and at the end, I'm adding the Q_DECLARE_METATYPE macro which should - per Qt documentation - be sufficient to use the class as a QVariant.

class Dataset
{
  Dataset();
  Dataset(const Dataset& _data);
  ~Dataset();
 ...
}
Q_DECLARE_METATYPE(Dataset)

class Dataset
{
  Dataset();
  Dataset(const Dataset& _data);
  ~Dataset();
 ...
}
Q_DECLARE_METATYPE(Dataset)

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Here's how I use the class:

...
   QVariant var;
   Dataset data;
   var.setValue(data);
...

...
   QVariant var;
   Dataset data;
   var.setValue(data);
...

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When trying to compile, I get the following output/error message:

/usr/include/QtCore/qmetatype.h(169): error: class "QMetaTypeId<Dataset *>" has no member "qt_metatype_id"
static inline int qt_metatype_id() { return QMetaTypeId<T>::qt_metatype_id(); }
^
detected during:
instantiation of "int QMetaTypeId2<T>::qt_metatype_id() [with T=Dataset *]" at line 230
instantiation of "int qMetaTypeId(T *) [with T=Dataset *]" at line 463 of "/usr/include/QtCore/qvariant.h"
instantiation of "void qVariantSetValue(QVariant &, const T &) [with T=Dataset *]" at line 528 of "/usr/include/QtCore/qvariant.h"
instantiation of "void QVariant::setValue(const T &) [with T=Dataset *]" at line 21 of "/home/user/projects/playground/source/Shared/GUI/DatasetTreeModel.cpp"

Any help is greatly appreciated!