无法访问类 sf::不可复制中的私有成员.副本在哪里?C++

使用 SFML 2.1

我决定制作一个包含我的音频文件的对象。但是，当我运行测试时，出现以下错误：

错误 C2248："sf：：不可复制：：不可复制"：无法访问类"sf：：不可复制"中声明的私有成员

我在SFML网站上查找了一些有关此错误的信息，它指出我无法复制继承sf：：NonCopyable的对象（我认为）。这些对象可能是我即将展示的sf：：Sound和sf：：音乐。真正的问题是：这个副本是在哪里制作的，我该如何修复它？

音频类

struct Audio {
    std::map<std::string, sf::Sound> sounds;
    std::map<std::string, sf::Music> musics;
    Audio() : sounds(),
        musics(){}

    void addSound(sf::Sound& s, sf::SoundBuffer& sb, std::string key){
        s.setBuffer(sb);
        sounds.insert(std::pair<std::string, sf::Sound>(key, s));
    }
    void addSound(sf::Sound& s, std::string key){
        sounds.insert(std::pair<std::string, sf::Sound>(key, s));
    }
    void addMusic(sf::Music& m, std::string key){
        musics.insert(std::pair<std::string, sf::Music>(key, m));
    }
    sf::Sound& getSound(std::string key){
        return sounds[key];
    }
    sf::Music& getMusic(std::string key){
        return musics[key];
    }
};

加载声音方法

void loadSounds(Audio& audio){
    sf::Music backgroundMusic;
    sf::Sound eating;
    sf::SoundBuffer sb_eating;
    sf::Sound moving;
    sf::SoundBuffer sb_moving;
    sf::Sound losing;
    sf::SoundBuffer sb_losing;
    sf::Sound begin;
    sf::SoundBuffer sb_begin;
    if (!backgroundMusic.openFromFile("backgroundmusic.wav"))
        std::cerr << "Error opening "backgroundmusic.wav"" << std::endl;
    if (!sb_eating.loadFromFile("eatingsfx.wav"))
        std::cerr << "Error opening "eatingsfx.wav"" << std::endl;
    if (!sb_moving.loadFromFile("movingsfx.wav"))
        std::cerr << "Error opening "movingsfx.wav"" << std::endl;
    if (!sb_losing.loadFromFile("losingsfx.wav"))
        std::cerr << "Error opening "losingsfx.wav"" << std::endl;
    if (!sb_begin.loadFromFile("beginsfx.wav"))
        std::cerr << "Error opening "beginsfx.wav"" << std::endl;
    eating.setBuffer(sb_eating);
    moving.setBuffer(sb_moving);
    losing.setBuffer(sb_losing);
    begin.setBuffer(sb_begin);
    audio.addMusic(backgroundMusic, std::string("backgroundMusic"));
    audio.addSound(eating, std::string("eating"));
    audio.addSound(moving, std::string("moving"));
    audio.addSound(losing, std::string("losing"));
    audio.addSound(begin, std::string("begin"));
}

主要方法

int main(){
    /*Initialize the objects*/
    Snake snake = Snake();
    Audio& audios = Audio();
    sf::Text textCount;
    Apple apple(0, 0);
    apple.locateApple();
    sf::RenderWindow window(sf::VideoMode(windowWidth, windowHeight), "SFML Application" );
    /*Load the audio*/
    loadSounds(audios);
    audios.getMusic("backgroundMusic").setVolume(10);
    audios.getMusic("backgroundMusic").setLoop(true);
    audios.getMusic("backgroundMusic").setVolume(25);

    /*Load the font*/
    sf::Font font;
    if (!(font.loadFromFile("arial.ttf")))
        std::cout << "Error loading fonts" << std::endl;
    /*Create the text*/
    textCount.setFont(font);
    textCount.setString(std::string("points: ") + std::to_string(points));
    textCount.setColor(sf::Color::Red);
    textCount.setCharacterSize(20);
    textCount.setPosition(windowWidth / 2 - (textCount.getString().getSize()*(textCount.getCharacterSize() / 5)), textCount.getCharacterSize() - 5);
    textCount.setStyle(sf::Text::Bold);
    window.draw(textCount);
    /*Set Framerate fps*/
    window.setFramerateLimit(10);
    /*MAIN GAME LOOP*/
    counterTick = 1;
    audios.getSound("begin").play();
    audios.getMusic("backgroundMusic").play();
    while (inGame)
    {
        std::string counter = std::to_string(counterTick);
        std::cout << "Tick: " + counter << std::endl;
        window.clear(sf::Color::Black);
        sf::Event event;
        while (window.pollEvent(event)){
            if (event.type == sf::Event::Closed)
                window.close();
        }
        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Key::Escape)) break;
        /*Call Updates*/
        snake.input();
        snake.checkReals();
        snake.moveUpdate();
        audios.getSound("moving").play();
        /*Call Collisions*/
        std::cout << "     Outside Collision Loop " << std::endl;
        checkApple(snake, apple, audios.getSound("eating"));
        checkBoundary(snake);
        /*Call Draw*/
        std::vector<sf::RectangleShape> shapearray = snake.draw();
        for (int i = shapearray.size() - 1; i >= 0; i--){
            window.draw(shapearray[i]);
        }
        window.draw(textCount);
        window.draw(apple.draw());
        window.display();
        counterTick++;
    }
    audios.getSound("losing").play();
    audios.getMusic("backgroundMusic").stop();
    std::system("PAUSE");//bad practice, debuggin purposes
    return 0;
}