sizeof(some pointer) 是否总是等于四?
例如:sizeof(char*) 返回 4.正如 int*、long long* 以及我尝试过的所有内容一样.有没有例外?
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，在 16 位系统上，指针大小为 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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