如何在 C++ 中的构造函数中初始化对象？

Question

I've created the player class, with a RectangleShape object as a private object, and I want to initialize it in the .cpp contstructor, but it doesn't work.

player.h:

#pragma once

#include <SFML/Graphics.hpp>

class Player {
    Player(int x, int y);

    private:
        int x;
        int y;
        sf::RectangleShape rect;

    public:
        void Move(int x, int y);
        void Update();
        void Render(sf::Window window);
};

And here is the player.cpp:

#include "player.h"
#include <SFML/Graphics.hpp>

Player::Player(int x, int y) {
    this->x = x;
    this->y = y;
    this->rect(sf::Vector3f(x, y)); //Sorry, this one is the one that doesn't work.
}

Answer 1

You should use constructor initialiser list. For example like this;

Class definition

class Player 
{
    Player(int x, int y);

    private:
        int x;
        int y;
        //other code...
};

Class implementation

    Player(int x, int y)
    :x(x), y(y)
    {
        //Constructor body
    }