構造函數是私有的？

Question

C：/ QT /.../ mymodel.h：-1： 在成員函數 '無效的MainWindow :: createModel（）'：

錯誤：基於myModel ::基於myModel（QObject的*）'是私人

錯誤：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); 

感謝。

Answer 1

我將在此前言說我剛剛瀏覽過其他Qt問題，然後偶然發現下面的文檔站點以獲得此猜測。

從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.

我猜你應該是你的public:前mymodel.h

移動這是SO後我曾經找到這個：

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