C ++析构函数。如何手动销毁成员变量 [英] C++ destructors. How to manually destroy member variables

问题描述

我有一个关于析构函数的基本问题。

I have a basic question on destructors.

假设我有以下类：

class A
{
public:

int z;
int* ptr;

A(){z=5 ; ptr = new int[3]; } ;
~A() {delete[] ptr;};

}

现在析构函数应该销毁对象的实例化。
上面的析构函数正是为了释放由new分配的动态分配的内存。

Now destructors are supposed to destroy an instantiation of an object. The destructor above does exactly that, in freeing the dynamically alloctaed memory allocated by new.

但是变量 z 是什么？我应该如何手动销毁它/释放由 z 分配的内存？当类超出范围时，它是否自动销毁？

But what about the variable z? How should I manually destroy it / free the memory allocated by z? Does it get destroyed automatically when the class goes out of scope?

推荐答案

它自动被销毁，虽然在你的例子 int z 是一个POD类型，没有显式析构函数...内存只是回收。否则，如果对象有一个析构函数，它将被调用来正确地清理非静态数据成员的资源，在主类 A 已完成，但未退出。

It gets "destroyed" automatically, although since in your example int z is a POD-type, there is no explicit destructor ... the memory is simply reclaimed. Otherwise, if there was a destructor for the object, it would be called to properly clean-up the resources of that non-static data member after the body of the destructor for the main class A had completed, but not exited.

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