[C++知识库]自动内存管理

自动内存管理

// 自动内存管理
class CObject {
public:
	CObject(std::string sName, CObject* opParent = nullptr) : msName(sName), mopParent(opParent) {
		if (mopParent != nullptr) {
			mopParent->mvAddChindObject(this);
		}
	}

	~CObject() {
		// 移除和父对象的映射
		if (mopParent != nullptr) {
			mopParent->mvRemoveChindObject(this);
		}

		// 删除子对象
		auto lst_chind_obj_temp = mlstChindObject;
		for (CObject* op_chind : lst_chind_obj_temp) {
			delete op_chind;
		}
		mlstChindObject.clear();

		std::cout << "delete object, name : " << msName << std::endl;
	}

	// 添加子对象
	void mvAddChindObject(CObject* opChild) {
		if (opChild == nullptr) {
			return;
		}

		if (auto itor = std::find(mlstChindObject.begin(), mlstChindObject.end(), opChild); itor == mlstChindObject.end()) {
			std::cout << msName << " add chind object " << opChild->msName << std::endl;
			mlstChindObject.push_back(opChild);
		}
	}

	// 移除子对象
	void mvRemoveChindObject(CObject* opChild) {
		if (opChild == nullptr) {
			return;
		}

		if (auto itor = std::find(mlstChindObject.begin(), mlstChindObject.end(), opChild); itor != mlstChindObject.end()) {
			std::cout << msName << " remove chind object " << opChild->msName << std::endl;
			mlstChindObject.remove(opChild);
		}
	}

private:
	std::string msName;
	CObject* mopParent;
	std::list<CObject*> mlstChindObject;
};

// 测试
void mvTest() {
	// 创建父对象
	CObject parent("Parent", nullptr);

	// 创建子对象
	CObject* op_parent_1  = new CObject("Parent1", &parent);
	CObject* op_child_1_1 = new CObject("Chind_1_1", op_parent_1);
	CObject* op_child_1_2 = new CObject("Chind_1_2", op_parent_1);
	CObject* op_child_1_3 = new CObject("Chind_1_3", op_parent_1);
	CObject* op_child_1_4 = new CObject("Chind_1_4", op_parent_1);

	// 创建子对象
	CObject* op_parent_2  = new CObject("Parent2", &parent);
	CObject* op_child_2_1 = new CObject("Chind_2_1", op_parent_2);
	CObject* op_child_2_2 = new CObject("Chind_2_2", op_parent_2);
	CObject* op_child_2_3 = new CObject("Chind_2_3", op_parent_2);
	CObject* op_child_2_4 = new CObject("Chind_2_4", op_parent_2);
}

创作打卡挑战赛

赢取流量/现金/CSDN周边激励大奖