关于c ++：SFML实现draw函数时派生类的模棱两可转换

SFML Ambiguous conversion from derived class when implementing draw function

我正在尝试通过自己的游戏引擎创建游戏，其中每个基本引擎都是一个GameObject，它将由一个更新功能和其他通知程序组成。

到目前为止，这是我的代码：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

#include <SFML/Audio.hpp>
#include <SFML/Graphics.hpp>
#include"AssetManager.hpp"

class GameObject : public sf::Drawable, public sf::Transformable
{
public:
virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const{
target.draw(*this, states);
};
};

class Sprite : public GameObject, public sf::Sprite {
public:
Sprite(AssetManager assetManager, std::string assetName) : sf::Sprite(){
setTexture(assetManager.getTextureNamed(assetName));
}
};

int main(int argc, char const** argv)
{
sf::RenderWindow window(sf::VideoMode::getDesktopMode(),"");
AssetManager assetManager = AssetManager("/Users/iProgram/Desktop/My Game Engine/My Game Engine");
assetManager.loadTextureWithName("tank","tank.png", sf::Vector2f(16,16));

Sprite tank = Sprite(assetManager,"tank");

while(window.isOpen()){
window.clear();
window.draw(tank);
window.display();
}

return EXIT_SUCCESS;
}

请注意，资产管理器仅将纹理存储在内存中，并在需要时以给定大小返回纹理。

问题出在线上：window.draw(tank);，我得到了错误

Ambiguous conversion from derived class 'const Sprite' to base class 'const sf::Drawable':

为什么在我已经在GameObject类中实现了draw函数的情况下，该如何解决？

相关讨论

为了解决这个问题，我不必像某些建议那样使用私有继承，我只需要我的基类(GameObject)就什么都不继承。然后，我的Sprite类将继承sf::Sprite，如下所示：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

#include <SFML/Audio.hpp>
#include <SFML/Graphics.hpp>
#include"AssetManager.hpp"

class GameObject{
public:
virtual void update(){}
};

class Sprite : public GameObject, public sf::Sprite {
public:
Sprite(AssetManager* assetManager, std::string assetName) : sf::Sprite(assetManager->getTextureNamed(assetName)){
}
};

class Tank: public Sprite{
public:
Tank(AssetManager* assetManager) : Sprite(assetManager,"tank"){
setScale(3, 3);
};

virtual void update(){
move(1,0);
}
};

int main(int argc, char const** argv)
{
sf::RenderWindow window(sf::VideoMode::getDesktopMode(),"");
AssetManager* assetManager = new AssetManager("/Users/iProgram/Desktop/My Game Engine/My Game Engine");
assetManager->loadTextureWithName("tank","tank.png", sf::Vector2f(16,16));

Tank tank = Tank(assetManager);
while(window.isOpen()){
sf::Event event;
while(window.pollEvent(event)){
if(event.type == sf::Event::Closed){
window.close();
}
}
tank.update();
window.clear();
window.draw(tank);
window.display();
}

return EXIT_SUCCESS;
}