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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