malloc(0)有什么意义?

本文介绍了malloc(0)有什么意义?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我刚刚看到了这个代码:

artist = (char *) malloc(0);

...我想知道为什么要这样做吗?

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

推荐答案

根据规范， malloc(0)将返回可以成功传递给free()的空指针或唯一指针".

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

这基本上让您什么也不分配，但是仍然不用担心将"artist"变量传递给对free()的调用.出于实际目的，它与执行操作几乎相同:

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;