将 `bool` 转换为 `u8` [英] Transmuting `bool` to `u8`

问题描述

以下代码与 amd64 上的 Rust 1.8 一起正常工作.

The following code works correctly with Rust 1.8 on amd64.

use std::mem;

fn main() {
    let f: u8 = unsafe { mem::transmute(false) };
    let t: u8 = unsafe { mem::transmute(true) };
    assert_eq!(0, f);
    assert_eq!(1, t);
}

我的问题是，我可以假设这总是有效吗?我试图找到关于 bool 表示的参考，但我只找到了 this 和 this，但我认为这不是权威.

My question is, can I assume that this will always works? I tried to find a reference about bool representation, but I only found this and this, but I think that is not authoritative.

推荐答案

从来没有任何 RFC 被采用来定义 bool 的表示.也就是说，作为一个实际问题，它不太可能改变.

There was never any RFC adopted defining the representation of bool. That said, as a practical matter it's very unlikely it will change.

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