当程序退出时，是否有理由在C ++中调用delete？ [英] Is there a reason to call delete in C++ when a program is exiting anyway?

问题描述

在我的C ++ main 函数中，例如，如果我有一个指向使用堆内存（而不是堆栈内存）的变量的指针 - 这是自动释放后我的应用程序退出？我会假设这样。

In my C++ main function, for example, if I had a pointer to a variable which uses heap memory (as opposed to stack memory) - is this automatically deallocated after my application exits? I would assume so.

即使如此，是最好的做法是总是删除堆分配，即使你认为它们永远不会在内存被自动释放的情况下使用退出？

Even so, is it good practice to always delete heap allocations even if you think they will never be used in a situation where the memory is automatically deallocated on exit?

例如，这是否有任何意义？

For example, is there any point in doing this?

int main(...)
{
    A* a = new A();
    a->DoSomething();
    delete a;
    return 0;
}

我在想我可能或其他人的refactors）代码并把它放在应用程序的其他地方， delete 是真正neccecary。

I was thinking maybe in case I refactor (or someone else refactors) that code and puts it elsewhere in the application, where delete is really neccecary.

正如Brian R. Bondy（它具体讨论了C ++中的含义）的答案，Paul Tomblin还有一个

As well as the answer by Brian R. Bondy (which talks specifically about the implications in C++), Paul Tomblin also has a good answer to a C specific question, which also talks about the C++ destructor.

推荐答案

重要的是明确地调用delete，因为你可能在析构函数中有一些代码要执行。像可能写一些数据到日志文件。如果你让操作系统为你释放你的内存，你的代码在析构函数中将不会被执行。

It is important to explicitly call delete because you may have some code in the destructor that you want to execute. Like maybe writing some data to a log file. If you let the OS free your memory for you, your code in your destructor will not be executed.

大多数操作系统将在程序结束时释放内存。但是这是一个好的习惯，自己释放它，就像我上面说的操作系统不会调用你的析构函数。

Most operating systems will deallocate the memory when your program ends. But it is good practice to deallocate it yourself and like I said above the OS won't call your destructor.

对于调用delete一般来说，是的，你总是想调用删除，否则你将有一个内存泄漏在您的程序，这将导致新的分配失败。

As for calling delete in general, yes you always want to call delete, or else you will have a memory leak in your program, which will lead to new allocations failing.

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