高清 1080P C++面向对象高级编程（侯捷） P13 13 委托相关设计

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class Component
{
    int value;
    public:
    Component(int val) {    value = val;
     }
     virtual void add(Component*){
     }
}

class Primitive: public Component
{
    public:
    Primitive(int val):Component(val){}
}

class Composite: public Component
{
    vector <Component*> c;
    public:
    Composite(int val):Component(val){}
    void add(Component* elem)
    {
     c.push_back(elem);
     }

}