我试图了解退出范围时析构函数调用的顺序。假设我有以下代码:
class Parent{
Parent(){cout<<"parent c called \n";}
~Parent(){cout<< "parent d called \n";}
};
class Child: public parent{
Child(){cout<< "child c called \n";}
~Child(){cout<<"child d called\n";}
};
现在,我知道子构造函数和析构函数是从父派生的,所以下面是主要的:
int main(){
Parent Man;
Child Boy;
return 0;
}
将产生输出:
parent c called
parent c called
child c called
... //Now what?
但是现在,当我退出范围时会发生什么?我有多个东西需要销毁,那么编译器如何选择顺序呢?我可以有两种输出可能性:
parent c called | parent c called
parent c called | parent c called
child c called | child c called
child d called | parent d called
parent d called | child d called
parent d called | parent d called
如果 Boy 首先被摧毁,则适用左侧情况,如果 Man 首先被摧毁,则适用右侧情况。计算机如何决定先删除哪一个?
最佳答案
派生析构函数在祖先析构函数之前被调用。所以 Child
析构函数体将首先被调用,然后是 Parent
析构函数体。并且构造的对象以相反的顺序销毁,因此 Boy
对象将在 Man
对象被销毁之前被销毁。
关于c++ - 离开范围时析构函数调用的顺序? (C++),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27496895/