是使用无效指针值用C是否合法？ [英] Is using an invalid pointer value legal in C?

问题描述

以下code是<一个href=\"http://stackoverflow.com/questions/1866461/why-should-i-not-try-to-use-this-value-after-delete-this/1866693#1866693\">undefined用C ++的行为（尽管它的工作好上几乎所有广泛使用的实现）：

The following code is undefined behavior in C++ (although it will work okay on almost any widely used implementation):

int* pointer; //uninitialized - likely illegal pointer value
pointer++; //incrementing an illegal pointer is UB

是上面code合法使用C？

Is the above code legal in C?

推荐答案

这在C未定义的行为，以及因为在某些平台上，加载一个无效的指针到寄存器触发一个硬件故障。

It's undefined behavior in C as well because on certain architectures, loading an invalid pointer into a register triggers a hardware fault.

请参阅http://stackoverflow.com/questions/3838855/is-storing-an-invalid-pointer-automatically-undefined-behavior/3839023#3839023

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