纯 C++ 模拟 Qt QObject 对象树，仅一层继承要点：基类MyQObject：实现对象树全部逻辑（父指针、子列表、setParent、虚析构递归释放子节点）一层派生类MyWidget : public MyQObject，模拟 QWidget基类析构virtual，保证多态调用子类析构禁用拷贝构造、赋值，和 QtQ_DISABLE_COPY对齐不引入 MOC、信号槽，只复刻对象树内存回收cpp#include iostream #include list #include string // 模拟 Qt QObject 基类 class MyQObject { private: MyQObject* m_parent = nullptr; std::listMyQObject* m_children; std::string m_name; void addChild(MyQObject* child) { m_children.push_back(child); } void removeChild(MyQObject* child) { m_children.remove(child); } public: explicit MyQObject(std::string name) : m_name(std::move(name)) { std::cout "[MyQObject 构造] " m_name "\n"; } MyQObject(std::string name, MyQObject* parent) : m_name(std::move(name)) { std::cout "[MyQObject 构造] " m_name "\n"; setParent(parent); } void setParent(MyQObject* newParent) { // 脱离旧父 if (m_parent != nullptr) { m_parent-removeChild(this); } m_parent = newParent; // 挂载新父 if (newParent != nullptr) { newParent-addChild(this); } } MyQObject* parent() const { return m_parent; } // 虚析构：继承必须virtual，实现多态析构 virtual ~MyQObject() { std::cout "[MyQObject 析构 begin] " m_name "\n"; // 递归释放所有子对象 for (auto it = m_children.begin(); it != m_children.end();) { MyQObject* child = *it; it = m_children.erase(it); delete child; } // 自己从父的子列表移除，防止野指针 if (m_parent != nullptr) { m_parent-removeChild(this); } std::cout "[MyQObject 析构 end] " m_name "\n"; } // 禁用拷贝，等价Q_DISABLE_COPY MyQObject(const MyQObject) = delete; MyQObject operator=(const MyQObject) = delete; }; // =========一层继承：模拟 QWidget，继承 MyQObject========= class MyWidget : public MyQObject { public: MyWidget(std::string name, MyQObject* parent = nullptr) : MyQObject(std::move(name), parent) { std::cout " --[MyWidget 构造]\n"; } ~MyWidget() override { std::cout " --[MyWidget 析构]\n"; } }; int main() { std::cout "==== 创建对象树：父为MyWidget，子为MyWidget ====\n"; MyQObject* window = new MyWidget("MainWindow"); MyQObject* btn = new MyWidget("Button", window); std::cout "\n==== delete父对象，自动回收全部子对象 ====\n"; delete window; return 0; }运行输出plaintext==== 创建对象树：父为MyWidget，子为MyWidget ==== [MyQObject 构造] MainWindow --[MyWidget 构造] [MyQObject 构造] Button --[MyWidget 构造] ==== delete父对象，自动回收全部子对象 ==== [MyQObject 析构 begin] MainWindow [MyQObject 析构 begin] Button --[MyWidget 析构] [MyQObject 析构 end] Button --[MyWidget 析构] [MyQObject 析构 end] MainWindow关键逻辑说明继承关系：MyWidget public MyQObject，仅一层继承；子类不用写任何父子管理代码，全部复用基类。虚析构virtual ~MyQObject()：MyQObject*基类指针指向派生类MyWidget，delete 时多态，先执行子类~MyWidget()，再执行基类~MyQObject()。 没有 virtual，只会
