“武器”：没有适当的默认构造函数可用 [英] "Weapon": no appropriate default constructor availa

问题描述

I don't get it. I've been staring at the code the code for a few hours and I don't know how I can fix it.
The class I'm creating, called Weapon.

This is how I defined the constructor:

    <pre lang="c++">template <class T1> Weapon (T1& A);

这是我实现构造函数的方式：

This is how I implement the constructor:

template<class T1> Weapon::Weapon(T1 & A)
    {
        if(A == Chicken)
	    {
		    (*texture).loadFromFile("Images/Egg.png");
		    sprite.setTexture(*texture);
		    sprite.setPosition((*(chickens.begin())).getPosition().x, (*(chickens.begin())).getPosition().y);
	    }
	    else if (A == Ship)
	    {
		    (*texture).loadFromFile("Images/Weapon.png");
		    sprite.setTexture(*texture);
		    sprit<code></code>e.setPosition(ship.getPosition());
	    }
    }

我有错误：



C2512武器：没有适当的默认构造函数



当我点击它时，另一个一个出现：



E0291类武器没有默认构造函数



并将我重定向到文件Engine.cpp

And I have error:

C2512 "Weapon": no appriopriate default constructor available

When I click on it, another one shows up:

E0291 no default constructor exists for class "Weapon"

and redirects me to the file "Engine.cpp"

Engine::Engine(RenderWindow & window)
    {
    	if (!background.loadFromFile("data/images/background.png"))
    	{
    		MessageBox(NULL, "Textures not found!", "ERROR", NULL);
    		return;
    	}
    	runEngine(window);
    }

并指向开头大括号。



我的班级引擎看起来像这样：

and points to the opening brace.

My class Engine looks like this:

class Engine
    {
    public:
	    Engine(RenderWindow &win);
	    ~Engine(void);

	    void runEngine(RenderWindow &window);
        template <class T1, class T2> bool isIntersecting(T1& A, T2& B);
        template <class T1, class T2> bool collisionTest(T1& A, T2& B);

    private:
	    Ship ship;
	    Weapon weapon;
	    Weapon egg;
	    vector<Chicken> chickens;
	    Texture background;
    };

提前致谢。



< b>我尝试过：

Thanks in advance.

What I have tried:

change the declaration of the constructor, in Weapon and in Engine

推荐答案

你还需要实现这个构造函数，因为

you need also to implement this constructors because of the

Weapon weapon;//object with default constructor
Weapon egg;

您需要这样的代码在实施中

You need such code in the implementation

Weapon::Weapon()
{
  //set some useful defaults
}

高级技巧：制作成员的指针并在其他地方构建它。

Advanced technique: make pointers of the member and construct it somewhere else.

这篇关于“武器”：没有适当的默认构造函数可用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！