没有

例如，在 x86-64 上，一个指针是 64 位长，但 int 只有 32 位长.将指针转换为 int 并再次返回会使指针值的高 32 位丢失.

For instance, on x86-64, a pointer is 64-bit long, but int is only 32-bit long. Casting a pointer to int and back again makes the upper 32-bit of the pointer value lost.

如果你想要一个保证与指针一样长的整数类型，你可以在 中使用 intptr_t 类型.您可以安全地从指向 intptr_t 的指针重新解释转换并返回.

You may use the intptr_t type in <cstdint> if you want an integer type which is guaranteed to be as long as the pointer. You could safely reinterpret_cast from a pointer to an intptr_t and back.