无法从.cpp访问.h中声明的私有成员

Question

我MainWindow mainWindow;在controller.h中声明了一个私有变量, 但我无法从controller.cpp访问它

或者Controller.h

#ifndef CONTROLLER_H
#define CONTROLLER_H

#include <QMainWindow>
#include "event_manager.h"
#include "event_wrapper.h"
#include "event_list_viewer.h"
#include "main_window.h"

class Controller
{
public:
    Controller();
    ~Controller();

    static Controller &GetInstance();
    MainWindow *SetupMainWindow();

private:
    MainWindow mainWindow;
};

#endif // CONTROLLER_H

controller.cpp

#include "controller.h"

Controller::Controller() {}
Controller::~Controller() {}

Controller& Controller::GetInstance()
{
   static Controller instance;
   return instance;
}

MainWindow* SetupMainWindow()
{
    bbque::EventManager *manager = &bbque::EventManager::GetInstance();
    bbque::EventWrapper *wrapper = manager->Deserialize(); //get wrapper via manager
    EventListViewer eventViewer;
    wrapper->setParent(&eventViewer);
    eventViewer = EventListViewer(wrapper, mainWindow); //cannot access mainWindow variable
    return new MainWindow(eventViewer);
}

为什么？

Answer 1

因为MainWindow* SetupMainWindow()是全局/独立功能,而不是您Controller班级的成员.您必须MainWindow* Controller::SetupMainWindow()在controller.cpp中声明成员函数.