Russian Qt Forum

C++ (Qt)
#include <QObject>
 
class CoordinateSystem;
 
class ProjectProperties: public QObject{
    Q_OBJECT
public:
    ProjectProperties(QObject *parent = 0);
    ~ProjectProperties();
 
public slots:
    CoordinateSystem* coordinateSystem()const {return curCoordinateSystem;}
    void setCoordinateSystem(const CoordinateSystem &newCoordinateSystem);
 
private:
    CoordinateSystem* curCoordinateSystem;
};
 

C++ (Qt)
#include "coordinatesystem.h"
#include "projectproperties.h"
 
ProjectProperties::ProjectProperties(QObject *parent): QObject(parent)
{
    curCoordinateSystem = new CoordinateSystem(this);
}
 
 
void ProjectProperties::setCoordinateSystem(const CoordinateSystem &newCoordinateSystem)
{
    *curCoordinateSystem = newCoordinateSystem; //TRUBLE
}
 

C++ (Qt)
#include <QObject>
 
class CoordinateSystem : public QObject{
    Q_OBJECT
public:
    CoordinateSystem(QObject *parent = 0);
    ~CoordinateSystem();
 
    QString name() const {return curName;}
    void setName(const QString &newName);
 
signals:
    void nameChanged();
 
private:
    QString curName;
};
 

C++ (Qt)
#include "coordinatesystem.h"
 
CoordinateSystem::CoordinateSystem(QObject *parent): QObject(parent)
{
 
}
 
CoordinateSystem::~CoordinateSystem()
{
 
}
 
void CoordinateSystem::setName(const QString &newName)
{
    curName = newName;
    emit nameChanged();
}
 

C++ (Qt)
#include <QtCore>
#include <QCoreApplication>
#include "coordinatesystem.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    ProjectProperties properties = new ProjectProperties();
    return a.exec();
}
 

C++ (Qt)
ProjectProperties *properties = new ProjectProperties();
 

C++ (Qt)
ProjectProperties *properties = new ProjectProperties();
 

C++ (Qt)
void ProjectProperties::setCoordinateSystem(const CoordinateSystem &newCoordinateSystem)
{
    *curCoordinateSystem = newCoordinateSystem;
}
 

C++ (Qt)
void ProjectProperties::setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
{
    curCoordinateSystem = newCoordinateSystem;
}
 

C++ (Qt)
void ProjectProperties::setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
{
    curCoordinateSystem = const_cast<CoordinateSystem*>(newCoordinateSystem);
}
 

C++ (Qt)
...
void ProjectProperties::setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
{
	curCoordinateSystem = const_cast<CoordinateSystem*>(newCoordinateSystem);
	curCoordinateSystem->setName("newName");
}
...
CoordinateSystem cs;
cs.setName("oldName");
qDebug() << cs.name();//oldName
ProjectProperties pp;
pp.setCoordinateSystem(&cs);
qDebug() << cs.name();//newName
...
 

C++ (Qt)
...
public slots:
    const CoordinateSystem* coordinateSystem() const {return curCoordinateSystem;}
    void setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
	{
		curCoordinateSystem = newCoordinateSystem;
	}
 
private:
    const CoordinateSystem* curCoordinateSystem;
...
 

C++ (Qt)
void ProjectProperties::setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
{
    curCoordinateSystem = const_cast<CoordinateSystem*>(newCoordinateSystem);
}
 

C++ (Qt)
void ProjectProperties::setCoordinateSystem(const CoordinateSystem *newCoordinateSystem)
{
    if (newCoordinateSystem){
      curCoordinateSystem = const_cast<CoordinateSystem*>(newCoordinateSystem); //так нельзя!
    };
}
 

C++ (Qt)
...
QPointer<CoordinateSystem> curCoordinateSystem;
...
 

C++ (Qt)
...
if (!curCoordinateSystem)
   return;
...
 

C++ (Qt)
CoordinateSystem* CoordinateSystem::clone(parent* QObject, CoordinateSystem* oldCS);
 

C++ (Qt)
CoordinateSystem* CoordinateSystem::clone(QObject *parent, CoordinateSystem* oldCS);
 

C++ (Qt)
...
private:
    Q_DISABLE_COPY(QObject)
...