sizeof(some pointer) 总是等于四吗?
例如:sizeof(char*)
返回 4.与 int*
、long long*
一样,我尝试过的一切.这有什么例外吗?
For example:
sizeof(char*)
returns 4. As does int*
, long long*
, everything that I've tried. Are there any exceptions to this?
推荐答案
你得到的保证是 sizeof(char) == 1
.没有其他保证,包括不保证 sizeof(int *) == sizeof(double *)
.
The guarantee you get is that sizeof(char) == 1
. There are no other guarantees, including no guarantee that sizeof(int *) == sizeof(double *)
.
实际上,指针在 16 位系统上的大小为 2(如果你能找到的话),在 32 位系统上为 4,在 64 位系统上为 8,但是依靠在给定的尺寸上.
In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there's nothing to be gained in relying on a given size.
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