C++如何删除一个结构体？

C++ how to delete a structure?

提问by Rella

Structure I created:

我创建的结构：

   struct VideoSample
  { 
      const unsigned char * buffer;
      int len;
  };

   VideoSample * newVideoSample = new VideoSample;
   newVideoSample->buffer = buf;
   newVideoSample->len = size;

       //...

How now to delete it now?

现在如何删除它？

回答by Amarghosh

delete newVideSample;

This won't free any memory you allocated to newVideoSample->bufferthough - you have to free it explicitly before deleting.

这不会释放您分配给的任何内存newVideoSample->buffer- 您必须在删除之前明确释放它。

//Free newVideSample->buffer if it was allocated using malloc
free((void*)(newVideSample->buffer));

//if it was created with new, use `delete` to free it
delete newVideSample->buffer;

//Now you can safely delete without leaking any memory
delete newVideSample;

Normally this kind of freeing is written in the destructorof the class so that it'll be called automatically when you deletethe dynamically created object.

通常，这种释放是在类的析构函数中编写的，以便delete在动态创建对象时自动调用它。

Thanks @steve for mentioning it :)

感谢@steve 提到它:)

回答by aschepler

delete newVideoSample;

But if the newand deleteare in the same context, you're probably better off skipping them and just creating it on the stack instead:

但是如果new和delete在相同的上下文中，你可能最好跳过它们而只是在堆栈上创建它：

VideoSample newVideoSample = {buf, size};

In that case, no cleanup is necessary.

在这种情况下，不需要清理。

回答by SLaks

You're looking for the deletekeyword:

您正在寻找delete关键字：

delete newVideoSample;

回答by vitaut

delete newVideoSample;

delete newVideoSample;

However, consider using a smart pointerthat will release the memory automatically, for example:

但是，请考虑使用会自动释放内存的智能指针，例如：

std::auto_ptr<VideoSample> newVideoSample(new VideoSample);

回答by Prasoon Saurav

Use delete

用 delete

VideoSample * newVideoSample = new VideoSample;
//.. stuffs

delete newVideoSample;

There is also an overloadi.e delete[]

还有一个重载即delete[]

VideoSample * newVideoSample = new VideoSample[n];
//.. stuffs

delete [] newVideoSample;

---

---

In Modern C++ it is always recommended to use smart pointers. You may want to use boost::shared_ptr<T>from the boost library.

在现代 C++ 中，始终建议使用智能指针。您可能想boost::shared_ptr<T>从 boost 库中使用。

回答by dripfeed

If you intended VideoSample to free its buffermember then VideoSample is a fragile class. It has no way of knowing whether bufwas created in the heap using new[]or malloc, or is the address of a variable on the stack.

如果您打算 VideoSample 释放其buffer成员，那么 VideoSample 是一个脆弱的类。它无法知道是否buf是在堆中使用new[]或 来创建的malloc，或者是堆栈上变量的地址。

回答by robev

In C++ a structure is the exact same as a class except everything is public by default, where a class is private by default. So a structure can have a destructor and is freed with delete.

在 C++ 中，结构与类完全相同，除了默认情况下所有内容都是公共的，默认情况下类是私有的。所以一个结构可以有一个析构函数，并通过 delete 释放。

回答by Justin Niessner

Unless I'm missing something, you just use delete:

除非我遗漏了什么，否则你只需使用delete：

delete newVideoSample;

回答by Abyx

delete newVideoSample. In C++ structis the same as classbut with default public fields.

delete newVideoSample. 在 C++struct中class与默认公共字段相同。

回答by Satyam

**You create object of Videosample , so you just use delete..

**您创建了 Videosample 的对象，因此您只需使用 delete..

VideoSample * newVideoSample = new VideoSample; delete newVideoSample;**

VideoSample * newVideoSample = new VideoSample; 删除新的视频样本；**