qt - 构造函数是私有(private)的？

Question

C:/Qt/.../mymodel.h:-1:在成员函数“void MainWindow::createModel()”中:

错误:“myModel::myModel(QObject*)”是私有(private)的

错误:在此上下文中

mymodel.h:

#ifndef MYMODEL_H
#define MYMODEL_H

#include <QStandardItemModel>

class myModel : public QStandardItemModel
{
public:
    Q_OBJECT

    myModel(QObject *parent = 0);
};

#endif // MYMODEL_H

mymodel.cpp:

#include "mymodel.h"

myModel::myModel(QObject *parent) :
    QStandardItemModel(parent)
{

}

ma​​inwindow.h

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow();

private slots:
    ...

signals:
    ...

private:
    ...
    myModel *model;
};

ma​​inwindow.cpp:

void MainWindow::createModel()
{
    model = new myModel(this);

谢谢。

Answer 1

我将在开头说，我刚刚浏览了其他 Qt 问题，然后偶然发现了下面的文档站点，得出了这个猜测。

来自http://doc.qt.digia.com/4.5/qobject.html#Q_OBJECT

The Q_OBJECT macro must appear in the private section of a class definition that declares its own signals and slots or that uses other services provided by Qt's meta-object system.

我猜你应该将其移到 mymodel.h 中的 public: 之前

这是我用来找到这个的SO帖子:

What does the Q_OBJECT macro do? Why do all Qt objects need this macro?