intptr_t的用途是什么? [英] What is the use of intptr_t?
问题描述
我知道这是一个整数类型，可以将其强制转换为指针/指针，而不会丢失数据，但是为什么我要这么做呢?
I know it is an integer type that can be cast to/from pointer without loss of data, but why would I ever want to do this? What advantage does having an integer type have over void* for holding the pointer and THE_REAL_TYPE* for pointer arithmetic?
编辑
标为已被问到"的问题无法回答此问题.这里的问题是，是否将intptr_t用作void*的常规替换是一个好主意，那里的答案似乎是不要使用intptr_t"，所以我的问题仍然有效:什么是好的用途intptr_t是什么情况?
EDIT
The question marked as "already been asked" doesn't answer this. The question there is if using intptr_t as a general replacment for void* is a good idea, and the answers there seem to be "don't use intptr_t", so my question is still valid: What would be a good use case for intptr_t?
推荐答案
主要原因是，不能在void *上执行按位运算，但是可以在intptr_t上执行相同的操作.
The primary reason, you cannot do bitwise operation on a void *, but you can do the same on a intptr_t.
在许多情况下，需要对地址执行按位运算，则可以使用intptr_t.
On many occassion, where you need to perform bitwise operation on an address, you can use intptr_t.
但是，对于按位运算，最好的方法是使用unsigned对应的uintptr_t.
However, for bitwise operations, best approach is to use the unsigned counterpart, uintptr_t.
如
As mentioned in the other answer by @chux, pointer comparison is another important aspect.
根据C11标准§7.20.1.4
Also, FWIW, as per C11 standard, §7.20.1.4,
这些类型是可选的.
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