C++构造和析构的顺序

C++构造函数和析构函数的顺序

#include <iostream>

using namespace std;

class CA {
public:
CA() { cout << "CA()" << endl; }
~CA() { cout << "~CA()" << endl; }
};

class CB : public CA {
public:
CB() { cout << "CB()" << endl; }
~CB() { cout << "~CB()" << endl; }
};

int main() {
cout << "Hello, World!" << endl;
CB b;

return 0;
}

输出:

Hello, World! 
CA() 
CB() 
~CB() 
~CA()

子类构造顺序:父类构造->子类有构造 
子类析构顺序:子类析构->父类析构

孙子类的构造和析构过程, 上代码:

#include <iostream>

using namespace std;

class CA {
public:
CA() { cout << "CA()" << endl; }
~CA() { cout << "~CA()" << endl; }
};

class CB : public CA {
public:
CB() { cout << "CB()" << endl; }
~CB() { cout << "~CB()" << endl; }
};

class CC : public CB {
public:
CC() { cout << "CC()" << endl; }
~CC() { cout << "~CC()" << endl; }
};

int main() {
cout << "Hello, World!" << endl;
//CB b;
CC c;

return 0;
}
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输出:

Hello, World!
CA()
CB()
CC()
~CC()
~CB()
~CA()
总结:

孙子类的构造过程: 爷类构造->父类构造-孙子类构造
孙子类的析构过程: 孙子类析构->父类析构->爷类析构
---------------------
作者：robertkun
来源：CSDN
原文：https://blog.csdn.net/robertkun/article/details/79202490
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