如何手动销毁成员变量？ [英] How to manually destroy member variables?

问题描述

我对析构函数有一个基本问题。

I have a basic question on destructors.

假设我有以下课程

class A
{
public:

int z;
int* ptr;

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

}

现在，析构函数应该破坏对象的实例化。
上面的析构函数正是这样做的，它释放了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 呢？我应该如何手动销毁它/释放 z 分配的内存？类超出范围时会自动销毁吗？

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

它会自动销毁，尽管在您的示例中是 int z 是POD类型的，没有显式的析构函数...只是简单地回收了内存。否则，如果该对象有一个析构函数，则将调用该函数以在主类 A 已完成，但尚未退出。

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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