为什么C ++中需要析构函数？ [英] Why are destructors required in C++?

问题描述

当指针超出范围，其内存被释放，为什么在c ++中创建析构函数

$ <$ p
< h2_lin>解决方案

如果你问为什么C ++类有析构函数，一些类有除了释放内存之外的需求。

此外，'unscoping'指针不会不是

em>>释放它指向的内存，因为其他指针可能正在引用它。

如果你有一个指针在堆栈上，退出函数将释放所使用的内存指针，但不指针指向的内存。有一个微妙但非常重要的区别。

When a pointer goes out of scope, its memory is freed, so why are destructors created in c++?

解决方案

If you're asking why C++ classes have destructors, some classes have requirements other than just freeing memory. You may have an object that's allocated a socket connection that needs to be shut down cleanly, for example.

Also, 'unscoping' a pointer does not free the memory that it points to since other pointers may be referencing it.

If you have a pointer on the stack, exiting the function will free the memory used by the pointer but not that memory pointed to by the pointer. There's a subtle but very important distinction.

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