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C++类构造析构基础

一、相关内容

  1. 模块中栈对象（类对象），先申请后释放；
  2. 嵌套对象，先申请成员对象再申请外部对象，释放时先释放外部对象，再释放成员对象；



二、栈对象申请释放

2.1同级别栈对象申请释放

结果：

  1 
  2 create MyClassA
  3 create MyClassB
  4 Hello World!
  5 delete MyClassB
  6 delete MyClassA
  7 
  8

代码（W32 控制台程序）：

  1 #include <iostream>
  2 
  3 class MyClassA
  4 {
  5 public:
  6     MyClassA();
  7     ~MyClassA();
  8 
  9 private:
 10 
 11 };
 12 
 13 MyClassA::MyClassA()
 14 {
 15     std::cout << "create MyClassA" << std::endl;
 16 }
 17 
 18 MyClassA::~MyClassA()
 19 {
 20     std::cout << "delete MyClassA" << std::endl;
 21 
 22 }
 23 
 24 class MyClassB
 25 {
 26 public:
 27     MyClassB();
 28     ~MyClassB();
 29 
 30 private:
 31 
 32 };
 33 
 34 MyClassB::MyClassB()
 35 {
 36     std::cout << "create MyClassB" << std::endl;
 37 
 38 }
 39 
 40 MyClassB::~MyClassB()
 41 {
 42     std::cout << "delete MyClassB" << std::endl;
 43 
 44 }
 45 
 46 int main()
 47 {
 48     MyClassA a;
 49     MyClassB b;
 50     std::cout << "Hello World!\n";
 51 }
 52


2.2嵌套对象申请释放

结果：

  1 
  2 create MyClassA
  3 create MyClassB
  4 Hello World!
  5 delete MyClassB
  6 delete MyClassA


代码：

  1 #include <iostream>
  2 
  3 class MyClassA
  4 {
  5 public:
  6     MyClassA();
  7     ~MyClassA();
  8 
  9 private:
 10 
 11 };
 12 
 13 MyClassA::MyClassA()
 14 {
 15     std::cout << "create MyClassA" << std::endl;
 16 }
 17 
 18 MyClassA::~MyClassA()
 19 {
 20     std::cout << "delete MyClassA" << std::endl;
 21 
 22 }
 23 
 24 class MyClassB
 25 {
 26 public:
 27     MyClassB();
 28     ~MyClassB();
 29 
 30     MyClassA a;
 31 
 32 private:
 33 
 34 };
 35 
 36 MyClassB::MyClassB()
 37 {
 38     std::cout << "create MyClassB" << std::endl;
 39 
 40 }
 41 
 42 MyClassB::~MyClassB()
 43 {
 44     std::cout << "delete MyClassB" << std::endl;
 45 
 46 }
 47 
 48 int main()
 49 {
 50     MyClassB b;
 51     std::cout << "Hello World!\n";
 52 }
 53



三、相关参考

posted @ 2022-03-28 00:26  mehome  阅读(29)  评论(0)  编辑  收藏  举报