指针的最佳实践 [英] Pointer best practice

问题描述

我刚开始学习C和奋斗的指针（当然）：）

I am just starting to learn C and (of course) struggling with pointers :)

由于这个片段：

int *storage, *storage_p;
storage = malloc(sizeof(int[GROW_BY]));
storage_p = storage;
// do something with storage, using storage_p
free(storage);
storage = NULL;

是否真正有必要申报与 malloc的工作两个变量（）编数据？它是很好的做法，创建一个存储和 storage_p 我做的方法是什么？如果不是，那会是'方式'？

Is it really necessary to have two variables declared to work with the malloc()'ed data? Is it good practice to create a storage and storage_p the way I did? If not, what would would be 'the way'?

推荐答案

您将需要一个指针，将举行由malloc（返回的值），这样您可以稍后释放它。

You will need a pointer that will hold the value returned by malloc(), so that you can free it later.

如果您计划使用storage_p的是要改变它的价值是什么，那么你将需要两个指针。

If what you plan on using storage_p for is going to change it value, then you are going to need two pointers.

不过，我一般保持纯粹的初始指针，并创建新的，临时的，因为我需要的。

However, I generally keep the pure initial pointer, and create new ones, ad hoc, as I need one.

int *storage = (int*) malloc(sizeof(int[GROW_BY])); 
// :
int* ptr = storage;
while (*ptr)
{
  // :
  ++ptr;
}

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