malloc(0) 的意义是什么? [英] What's the point of malloc(0)?

问题描述

我刚看到这个代码:

artist = (char *) malloc(0);

...我想知道为什么要这样做?

...and I was wondering why would one do this?

推荐答案

根据规范，malloc(0) 将返回一个空指针或一个可以成功传递给 free() 的唯一指针".

According to the specifications, malloc(0) will return either "a null pointer or a unique pointer that can be successfully passed to free()".

这基本上可以让你不分配任何东西，但仍然可以放心地将artist"变量传递给对 free() 的调用.出于实际目的，这与执行几乎相同:

This basically lets you allocate nothing, but still pass the "artist" variable to a call to free() without worry. For practical purposes, it's pretty much the same as doing:

artist = NULL;

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