C ++如何删除结构？ [英] C++ how to delete a structure?

问题描述

我创建的结构：

  struct VideoSample 
 {
 const unsigned char * 
 int len; 
}; 
 
 VideoSample * newVideoSample = new VideoSample; 
 newVideoSample-> buffer = buf; 
 newVideoSample-> len = size; 
 
 // ... 
  

如何立即删除？ / p>

解决方案

  delete newVideSample; 
  

这不会释放您分配给 newVideoSample-> buffer的任何内存

$ b

  //免费newVideSample->缓冲区如果是使用malloc分配
 free（（void *）（newVideSample-> buffer））; 
 
 //如果是用new创建的，使用`delete`来释放它
 delete newVideSample-> buffer; 
 
 //现在你可以安全地删除不泄露任何内存
 delete newVideSample; 
  

通常这种释放是写在析构函数，以便在 delete 动态创建的对象时自动调用。 / p>

感谢@steve提及它：）

Structure I created:

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

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

       //...

How now to delete it now?

解决方案

delete newVideSample;

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

//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 destructor of the class so that it'll be called automatically when you delete the dynamically created object.

Thanks @steve for mentioning it :)

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