C free()例程和递增的数组指针 [英] C free() routine and incremented array pointers

问题描述

如果我动态分配一个数组然后传递(不是初始指针，而是指向数组中间的指针)，free()例程会工作吗?示例:

Will the free() routine work if I dynamically allocate an array and then pass, not the initial pointer, but a pointer to the middle of the array? Example:

int* array = malloc(10 * sizeof *array);
if(array) {

  array += 5; // adjusting the indicies

  free(array);
}

还是在调用free()之前需要将指针设置回数组的开头?

Or do I need to set the pointer back to the start of the array before calling free()?

推荐答案

绝对不是.传递给free()的值必须与malloc()返回的值完全相同.实际上，为确保这种情况，我建议您使用指针的副本，如果您需要可以增加或修改的指针.

Absolutely not. The value passed to free() must be exactly the same value returned by malloc(). In fact, to ensure this is the case, I would recommend you use a copy of the pointer if you need a pointer you can increment or otherwise modify.

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