错误C2280：尝试引用已删除的函数 [英] error C2280: attempting to reference a deleted function

问题描述

我是游戏开发的新手，非常新的c ++，但我已经开始开发一个小Arkanoid游戏。我以前已经运行它，但重构后（介绍ArkanoidGame类）它不编译，我不能弄清楚为什么。

I'm new to game development and very new to c++, but I've started developing a little Arkanoid game. I've had it running previously, but after refactoring (introducing the ArkanoidGame class) it doesnt compile and I cannot figure out why.

我得到的错误是：

d:\dropbox\development\gamedev\c++\arkanoid\arkanoid\main.cpp(14): error C2280:
    'ArkanoidGame::ArkanoidGame(void)' : attempting to reference a deleted function
d:\dropbox\development\gamedev\c++\arkanoid\arkanoid\arkanoidgame.h(25) : 
    compiler has generated 'ArkanoidGame::ArkanoidGame' here

我只是不明白这是什么意思，不知道该怎么做来解决它。

I simply dont understand what this means and have no idea what to do to fix it.

我包含了问题的类：

Main.cpp：

#include "ArkanoidGame.h"

int main() {
    ArkanoidGame game;
    game.init(800, 600);
    while (game.isRunning()) {
        game.checkInput();
        game.checkCollisions();
        game.draw();
    }
    return 0;
}

Arkanoid.h：

Arkanoid.h:

#include "Ball.h"
#include "Pad.h"
#include <SFML/Graphics.hpp>
#include <stdarg.h>
#include <memory>

class ArkanoidGame
{
private:
    bool running;
public:
    void ArkanoidGame::init(int, int);
    bool ArkanoidGame::isRunning();
    void ArkanoidGame::checkCollisions();
    void ArkanoidGame::checkInput();
    void ArkanoidGame::update();
    void ArkanoidGame::draw();
    sf::RenderWindow* window;
    Pad pad;
    Ball ball;
};

ArkanoidGame.cpp：

ArkanoidGame.cpp:

#include "ArkanoidGame.h"

void ArkanoidGame::init(int windowWidth, int windowHeight) {
    window = new sf::RenderWindow(sf::VideoMode(windowWidth, windowHeight), "Arkanoid!");
    window->setFramerateLimit(60);

    ArkanoidGame::running = true;

    //Init pad
    pad = Pad((float)(windowWidth / 2), (float)(windowHeight - 50));

    //Init ball
    ball = Ball(0.f, 0.f);
}

template<class T1, class T2> bool intersect(T1& mA, T2& mB) {
    return mA.right() >= mB.left() && mA.left() <= mB.right()
        && mA.bottom() >= mB.top() && mA.top() <= mB.bottom();
}

void ArkanoidGame::checkCollisions() {
    if (!intersect(pad, ball)) return;

    ball.velocity.y = -ball.ballVelocity;

    if (ball.x() < pad.x()) {
        ball.velocity.x = -ball.ballVelocity;
    }
    else {
        ball.velocity.x = ball.ballVelocity;
    }
}

void ArkanoidGame::update() {
    //Update positions
    pad.update(window->getSize().x);
    ball.update(window->getSize().x, window->getSize().y);
}

void ArkanoidGame::draw() {
    window->clear(Color::Black);
    window->draw(pad.getShape());
    window->draw(ball.getShape());
    window->display();
}

void ArkanoidGame::checkInput() {
    if (Keyboard::isKeyPressed(Keyboard::Key::Escape)) {
        running = false;
    }
}

bool ArkanoidGame::isRunning() {
    return running;
}

推荐答案

$ c> Pad 或 Ball （或两者）没有默认构造函数;因此不能为包含它们的类生成一个。

Presumably, either Pad or Ball (or both) has no default constructor; therefore one can't be generated for a class that contains them. They must be initialised using one of their declared constructors.

最好的解决方法是删除你的奇怪的 init 函数，并用构造函数替换它：

The best solution is to remove your weird init function, and replace it with a constructor:

ArkanoidGame(int windowWidth, int windowHeight) :
    running(true),
    window(new ...),
    Pad(windowWidth / 2, windowHeight - 50),
    Ball(0,0)
{
    window->setFramerateLimit(60);
}

int main() {
    ArkanoidGame game(800, 600);
    // ...
}

阶段初始化舞蹈的某些原因，那么你需要为 Pad 和 Ball 提供默认构造函数。我不会推荐，虽然;如果无法在无效状态下创建对象，则出现错误的可能性较小。

If you really want a two-stage initialisation dance for some reason, then you'll need to provide default constructors for both Pad and Ball. I wouldn't recommend that though; there's less scope for errors if an object can't be created in an invalid state.

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