Rust：将可变 u8 指针转换为可变引用

Question

如何将可变 u8 指针转换为另一种类型的可变引用？

let ptr: *mut u8;

let reference: &mut SomeType = ?; // What should i do here?

我找到了一种可行的解决方案，但我想知道是否有更好的方法：

let reference = unsafe { &mut *(ptr as *mut SomeType) };

Answer 1

您可以改用 std::mem::transmute：

use std::mem::transmute;
#[repr(transparent)]
struct SomeStruct(u8);

fn main() {
    let a = &mut 10u8;
    let ptr = a as *mut u8;
    let reference: &mut SomeStruct = unsafe { transmute(ptr) };
}