class Component {
public:
    virtual ~Component() = default;
    virtual void operation() const = 0;
    virtual void add(Component* child) {
        throw std::runtime_error("Not supported.");
    }
    virtual void remove(Component* child) {
        throw std::runtime_error("Not supported.");
    }
    virtual const std::vector<Component*>& getChildren() const {
        throw std::runtime_error("Not supported.");
    }
    virtual bool isComposite() const { return false; }
};

class Leaf : public Component {
public:
    void operation() const override {
        std::cout << "Leaf operation.\n";
    }
};

class Composite : public Component {
private:
    std::vector<Component*> children_;
<p>public:
void operation() const override {
std::cout << "Composite operation:\n";
for (const auto* child : children_) {
child->operation();
}
}</p><pre class='brush:php;toolbar:false;'>void add(Component* child) override {
    children_.push_back(child);
}

void remove(Component* child) override {
    children_.erase(
        std::remove(children_.begin(), children_.end(), child),
        children_.end()
    );
}

const std::vector<Component*>& getChildren() const override {
    return children_;
}

bool isComposite() const override { return true; }

};

迷你天猫商城是一个基于Spring Boot的综合性B2C电商平台，需求设计主要参考天猫商城的购物流程：用户从注册开始，到完成登录，浏览商品，加入购物车，进行下单，确认收货，评价等一系列操作。 作为迷你天猫商城的核心组成部分之一，天猫数据管理后台包含商品管理，订单管理，类别管理，用户管理和交易额统计等模块，实现了对整个商城的一站式管理和维护。所有页面均兼容IE10及以上现代浏览器。部署方式1、项目

int main() {
    Component* leaf1 = new Leaf();
    Component* leaf2 = new Leaf();
    Component* composite = new Composite();
<pre class='brush:php;toolbar:false;'>composite->add(leaf1);
composite->add(leaf2);

Component* sub_composite = new Composite();
sub_composite->add(new Leaf());
composite->add(sub_composite);

composite->operation();  // 递归执行所有子节点

// 清理资源（实际项目建议用智能指针）
delete leaf1;
delete leaf2;
delete sub_composite;
delete composite;

return 0;

}