Qt: Create a new class with another parameter - c++

Question

I have a problem in instantiating a new class with another parameter.
My problem is to add something in a QList Asteroids Object. In Qt, I have this error message:
cannot convert 'SettingsAsteroid' to 'SettingsAsteroid*' in assignment
this->settingsAsteroid = SettingsAsteroid();
Below are the relevant files of the class doing it, and I think other classes are not relevant.
Data in GameView.h :
#ifndef GAMEVIEW_H
#define GAMEVIEW_H
#include <QGraphicsView>
#include <QGraphicsItem>
#include <QApplication>
#include <QPushButton>
#include <QList>
#include <QObject>
#include <QString>
#include "Asteroid.h"
#include "SettingsAsteroid.h"
class GameView : public QGraphicsView
{
Q_OBJECT
// Data
int nbAsteroids;
int nbAsteroidsAlive;
SettingsAsteroid* settingsAsteroid;
QList<Asteroid> asteroids;
// Menu
QPushButton *startgame;
// Scène
QGraphicsScene* grfxScene;
public:
GameView();
~GameView();
private slots:
void start();
};
#endif // GAMEVIEW_H
Source code in GameView.c :
#include "GameView.h"
#include <iostream>
GameView::GameView()
{
int nbAsteroids = 0;
int nbAsteroidsAlive = 0;
// data de jeu
this->settingsAsteroid = SettingsAsteroid();
//Scene de debut
this->grfxScene = new QGraphicsScene();
grfxScene->setSceneRect(0,0,800,600);
this->grfxScene->addPixmap(QPixmap(":/images/armageddon.jpg"));
setScene(this->grfxScene);
}
GameView::~GameView(){ }
void GameView::start()
{
this->grfxScene->clear();
int nbAsteroids = 4;
int nbAsteroidsAlive = 4;
int i;
for(i=0;i<nbAsteroids;i++) {
asteroids.append(new Asteroid(settingsAsteroid));
}
}
Constructor of Asteroid.c :
Asteroid::Asteroid(SettingsAsteroid settingsAsteroid)

Answer 1

Based on your error
cannot convert 'SettingsAsteroid' to 'SettingsAsteroid*' in assignment this->settingsAsteroid = SettingsAsteroid();
On the code:
this->settingsAsteroid = SettingsAsteroid();
You are attempting to convert a SettingsAsteroid into a SettingsAsteroid*, that is: a pointer to a SettingsAsteroid object.
Because GameView has a member settingsAsteroid which is a SettingsAsteroid*, you need to give it a pointer to a SettingsAsteroid, not a SettingsObject itself. You can do one of the following:
this->settingsAsteroid = new SettingsAsteroid();
Calling new will allocate memory for the required object (your SettingsAsteroid) and return a pointer to that memory, of type SettingsAsteroid*. Alternatively, if you already have some SettingsAsteroid object you could assign it instead:
SettingsAsteroid sa;
...
this->settingsAsteroid = &sa;