构造函数是私有的？

Question

C：/ QT /.../ mymodel.h：-1： 在成员函数 '无效的MainWindow :: createModel（）'：

错误：基于myModel ::基于myModel（QObject的*）'是私人

错误：此背景下

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) 
{ 

} 

mainwindow.h

class MainWindow : public QMainWindow 
{ 
    Q_OBJECT 

public: 
    explicit MainWindow(); 

private slots: 
    ... 

signals: 
    ... 

private: 
    ... 
    myModel *model; 
}; 

mainwindow.cpp：

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

感谢。

Answer 1

我将在此前言说我刚刚浏览过其他Qt问题，然后偶然发现下面的文档站点以获得此猜测。

从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.

我猜你应该是你的public:前mymodel.h

移动这是SO后我曾经找到这个：

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