sizeof(some pointer) 总是等于四吗? [英] Is the sizeof(some pointer) always equal to four?

问题描述

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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