如何检查指针是否已在C中释放? [英] How to check if a pointer is freed already in C?

问题描述

我想检查指针是否已经释放.如何使用gnu编译器集执行此操作?

I would like to check if a pointer is freed already or not. How do I do this using gnu compiler set?

推荐答案

您不能.跟踪它的方法是在释放指针后将其分配给0或NULL.但是，正如弗雷德·拉尔森(Fred Larson)所述，这对指向同一位置的其他指针没有任何作用.

You can't. The way to track this would be to assign the pointer to 0 or NULL after freeing it. However as Fred Larson mentioned, this does nothing to other pointers pointing to the same location.

int* ptr = (int*)malloc(sizeof(int));
free(ptr);
ptr = NULL;

这篇关于如何检查指针是否已在C中释放?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！