[Qt-interest] Nested Custom Types

[Thomas Ehrnhoefer]

Ah, I see.
>From your link:
"The main consequence is that you should use pointers to QObject (or to your
QObject subclass) where you might otherwise be tempted to use your QObject
subclass as a value."

So nested custom types need to be pointers. Compiles now, thanks for your
help Samuel.

On Fri, Apr 1, 2011 at 8:20 AM, Samuel Gaist <samuel.gaist at edeltech.ch>wrote:

> Hi,
>
> The simple and short answer is: QObject cannot be copied
>
> For more information :
> http://doc.qt.nokia.com/4.7/qobject.html#details
>
> Hope this helps
> Samuel
>
> On 1 avr. 2011, at 17:07, Thomas Ehrnhoefer wrote:
>
> > Hi
> >
> > I am new to Qt and am currently in the process of working on the model of
> my application. Since I want to take advantage of the MetaObjectModel (need
> to generically (un)marshall data to objects), I am studying and using the
> documentation available on this.
> > However I am running into compiler issues with nested custom types (see
> end of email for sample code).
> >
> > The error I am getting is when compiling the custom type which has
> another custom type as member, and the output is something like:
> >
> > [some].h(34) : error C2248: 'QObject::operator =' : cannot access private
> member declared in class 'QObject'
> > This diagnostic occurred in the compiler generated function '[some]
> &[some]::operator =(const [some] &)'
> >
> > Any input would be very much appreciated, thanks!
> >
> > Thomas
> >
> > P.S.:
> > Here is a simple example of what me code looks like. There is a simple
> Person object, and a Container object with a person as member:
> >
> > ===== person.h =====
> > #ifndef PERSON_H
> > #define PERSON_H
> > #include <QObject>
> > #include <QMetaType>
> >
> > class Person : public QObject
> > {
> >     Q_OBJECT
> >     Q_PROPERTY(QString _name READ name WRITE setName)
> >
> > public:
> >     Person();
> >     Person(const Person &other);
> >     Person(QObject *parent);
> >     ~Person();
> > public slots:
> >     QString name() const;
> >     void setName(QString name);
> > private:
> >     QString _name;
> > };
> > Q_DECLARE_METATYPE(Person);
> > #endif // PERSON_H
> >
> >
> >
> > ===== person.cpp =====
> > #include "person.h"
> >
> > Person::Person() {}
> >
> > Person::Person(const Person &other) { _name = other._name; }
> >
> > Person::Person(QObject *parent) : QObject(parent){}
> >
> > Person::~Person(){}
> >
> > QString Person::name() const { return _name; }
> >
> > void Person::setName(QString name) { _name = name; }
> >
> >
> >
> > ===== container.h =====
> > #ifndef CONTAINER_H
> > #define CONTAINER_H
> > #include <QObject>
> > #include <QMetaType>
> >
> > class Container : public QObject
> > {
> >     Q_OBJECT
> >     Q_PROPERTY(QString _summary READ summary WRITE setSummary)
> >     Q_PROPERTY(Person _owner READ owner WRITE setOwner)
> > public:
> >     Container();
> >     Container(const Container &other);
> >     Container(QObject *parent);
> >     ~Container();
> > public slots:
> >     QString summary() const;
> >     Person owner() const;
> >     void setOwner(Person owner);
> >     void setSummary(QString summary);
> > private:
> >     QString _summary;
> >     Person _owner;
> > };
> >
> > Q_DECLARE_METATYPE(Container);
> > #endif // CONTAINER_H
> >
> >
> >
> > ===== container.cpp =====
> >
> > #include "container.h"
> >
> > Container::Container()
> > {
> > }
> >
> > Container::Container(const Container &other) :
> >     _owner(other._owner())
> > {
> >     _summary = other._summary;
> > }
> >
> > Container::Container(QObject *parent) : QObject(parent) {}
> >
> > Container::~Container() {}
> >
> > QString Container::summary() const { return _summary; }
> >
> > Person TaskHandle::owner() const { return _owner; }
> >
> > void Container::setSummary(QString summary) { _summary = summary; }
> >
> > void TaskHandle::setOwner(Person owner) { _owner = owner; }
> >
> >
> >
> > --
> > Thomas Ehrnhoefer
> > Software Developer, http://tasktop.com
> > _______________________________________________
> > Qt-interest mailing list
> > Qt-interest at qt.nokia.com
> > http://lists.qt.nokia.com/mailman/listinfo/qt-interest
>
> _______________________________________________
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>



-- 
Thomas Ehrnhoefer
Software Developer, http://tasktop.com
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