Inheriting constructor from QObject based class

Question

I have a class called MiscData that inherits QObject and has a member variable (a model). And then bunch of other classes that inherit MiscData and reimplement its virtual function to populate the model. So it looks like this:

class MiscData : public QObject
{
    Q_OBJECT
public:
    explicit MiscData(QObject *parent = 0);
    QAbstractItemModel &model();
private:
    virtual void loadData() = 0;
private:
    QStandardItemModel m_Model;
}

and one of the descendant looks like this:

class LogData : public MiscData
{
    Q_OBJECT
public:
    using MiscData::MiscData;
private:
    virtual void loadData() override;
}

I know that I must use an explicit constructor for MiscData because it initializes the model member variable. But I am wondering whether it is safe to use using directive in the derived class to inherit MiscData's constructor like this.

EDIT: Based on the answer it seems to be fine event to use using QObject::QObject in the MiscData too.

Answer 1

You can call the base class' constructor in the initializer list.

class LogData : public MiscData
{
    Q_OBJECT
public:
    explicit LogData(QObject *parent = 0) : MiscData(parent) {};
private:
    virtual void loadData() override;
}

where MiscData's constructor should pass parent the to QObject the same way:

class MiscData : public QObject
{
    Q_OBJECT
public:
    explicit MiscData(QObject *parent = 0) : QObject(parent) {};
    QAbstractItemModel &model();
private:
    virtual void loadData() = 0;
private:
    QStandardItemModel m_Model;
}

The constructor's definition can be moved into the .cpp file if you want.

using just makes stuff available and does not call anything.