QList: Append a custom class.

brunjak

Hi,
I'm new in c++ and qt and I'm struggling with QList and copy-constructor. Compiling results in the following erros:

error: undefined reference to `MachineSet::operator=(MachineSet const&)'

within the header file

class Production
    {
    public:
        Production()
        {
        }
        Production(const Production& production)
        {
            mMachineSet = production.mMachineSet;
        }
        Production &operator = (const Production &other);

        MachineSet mMachineSet;
        MaterialSet mMaterialSet;
        ToolSet mToolSet;
        CutterSet mCutterSet;
        GeometrySet mGeometrySet;
    };

The definition of MachineSet is as follows:

class MachineSet
{
public:
    MachineSet(const QString &fileName);
    MachineSet(const MachineSet& machineSet);   // Copy-Konstruktor
    MachineSet();
    MachineSet *operator = (const MachineSet &other);
    ~MachineSet();

    enum class MYERROR
    {
        noError,
        couldNotOpenFile,
        dataListIsEmpty,
        xmlStreamReaderError,
        qFileError
    };

    class Machine
    {
    public:
       Machine()
       {
           mCompany = "";
           mProductFamiliy = "";
           mProductName = "";
           mProductShortDescription = "";
           mProductDetailedDescription = "";
           mIp4Address = "";
           mUsername = "";
           mPassword = "";
           mLocation = "";
           mMaxWidth = 0.0;
           mMaxLength = 0.0;
           mMaxHight = 0.0;
       }
       QString mCompany;
       QString mProductFamiliy;
       QString mProductName;
       QString mProductShortDescription;
       QString mProductDetailedDescription;
       QString mIp4Address;
       QString mUsername;
       QString mPassword;
       QString mLocation;
       QString mFirstName;
       QString mLastName;
       QString mStreet;
       QString mHouseNumber;
       QString mZipCode;
       QString mCity;
       double mMaxWidth;
       double mMaxLength;
       double mMaxHight;

       Machine(const Machine& machine)       // copy-constructor
       {
           mCompany = machine.mCompany;
           mProductFamiliy = machine.mProductFamiliy;
           mProductName = machine.mProductName;
           mProductShortDescription = machine.mProductShortDescription;
           mProductDetailedDescription = machine.mProductDetailedDescription;
           mIp4Address = machine.mIp4Address;
           mUsername = machine.mUsername;
           mPassword = machine.mPassword;
           mLocation = machine.mLocation;
           mFirstName = machine.mFirstName;
           mLastName = machine.mLastName;
           mStreet = machine.mStreet;
           mHouseNumber = machine.mHouseNumber;
           mZipCode = machine.mZipCode;
           mCity = machine.mCity;
           mMaxWidth = machine.mMaxWidth;
           mMaxLength = machine.mMaxLength;
           mMaxHight = machine.mMaxHight;
       }

       Machine *operator = (const Machine &other);
    };

    QList<Machine> mMachineSetList;
    QFile *p_mXmlFile;

    QXmlStreamReader mXmlStreamRead;
    QXmlStreamWriter mXmlStreamWrite;

    MYERROR readSetFromXmlFile();
    MYERROR readMachineFromXmlFile(Machine *p_machine);

    MYERROR writeSetToXmlFile();
    MYERROR writeMachineToXmlFile(Machine *p_machine);

private:
    QString mFilename;

};

Any idea? Thank you
Jakob

brunjak

Thank you for your help. The problem was here:

MachineSet &operator = (const MachineSet &other);

changing to

MachineSet operator = (const MachineSet &other);

works.

Thank you

dheerendra

Production &operator = (const Production &other);

I suspect the issue with the signature. Try changing like the following.

Production operator = (const Production &other)

brunjak