Composite in C++ 错误 [没有匹配的成员函数来调用 'push_back']

Question

你好，我想做一个简单的复合，我在尝试将一个组件添加到复合中进行训练时遇到错误

这是代码

组件界面绘图合成界面

class ObjectInterface
{
public:
ObjectInterface() {}
virtual void draw()=0;
virtual void applyTranslation(float x,float y){}
virtual void applyRotationDirect(float angle){}
virtual void applyRotationIndirect(float angle){}
virtual void applyHomethety(float ratio){}
virtual void applyAxialSymmetry(){}
virtual void applyCentralSymmetry(){}
};

一个元素 - 行

class Line : public ObjectInterface,Object2D
{
public:
    Line(string color,Point p1,Point p2);
    // Inherited method from Object2D
    float getArea();
    float getPerimeter();

    // Inherited method from ObjectInterface
    virtual void draw();
    void applyTranslation(float x,float y);
    void applyRotationDirect(float angle);
    void applyRotationIndirect(float angle);
    void applyHomethety(float ratio);
    void applyAxialSymmetry();
    void applyCentralSymmetry();

    friend ostream& operator<< (ostream &os, const Line &p);
 };

class Fresque : public ObjectInterface
{
public:
    Fresque();
    // Inherited method from ObjectInterface
    void draw();
    void applyTranslation(float x,float y);
    void applyRotationDirect(float angle);
    void applyRotationIndirect(float angle);
    void applyHomethety(float ratio);
    void applyAxialSymmetry();
    void applyCentralSymmetry();

    // Personal method
    bool add(ObjectInterface const &o);
    bool remove(ObjectInterface const& o);

private:
    std::vector<ObjectInterface*> objects;  // CONTAINER FOR COMPOSITE
 };

添加方法的cpp文件

bool Fresque::add(ObjectInterface const & o){
  objects.push_back(o);  //===> THE ERROR HERE
return true;
}

错误：

/fresque.cpp:50: erreur: 没有匹配的成员函数来调用 'push_back' objects.push_back(o); ~~~~~~~~^~~~~~~~~

IDE 是 QT，我很遗憾不知道错误在哪里，我很确定这是一个明显的错误:/.

Answer 1

std::vector<ObjectInterface*> 是指向 ObjectInterface 的指针向量。 o是一个ObjectInterface，不是ObjectInterface*（指向ObjectInterface的指针），所以需要得到o的地址：

objects.push_back(&o);

Composite in C++ 错误 [没有匹配的成员函数来调用 'push_back']

Composite in C++ error [no matching member function to callto 'push_back']

c++

qt

design-patterns

reference

composite