英文:
How to convert an enum variant into u8 in Rust?
问题
我想这样做。```rust#[repr(u8)]pub enum MessageType {认证,// ...}fn main() {let message_type = MessageType::认证;let binary_representation: u8 = message_type.into();}
我觉得我不得不手动实现 into。
有没有人有一个可以使用这个表示来转换我的类型的解决方案。
我觉得可以在不安全的情况下做到，但我宁愿不这样做。
这仍然可能对文化有趣。
<details><summary>英文:</summary>I would like to do that.
#[repr(u8)]
pub enum MessageType {
Authentification,
// ...
}
fn main() {
let message_type = MessageType::Authentification;
let binary_representation: u8 = message_type.into();
}
I see myself obliged to implement into by hand.Does anyone have a solution that would use the representation to convert my type.I think it's possible to do it in unsafe, but I'd rather not.It could still be interesting for culture.</details># 答案1**得分**: 2你需要手动定义每个变体的值，并在转换时使用 `as` 而不是 `.into()`，因为 `Into<u8>` 没有由 `MessageType` 实现：```rust#[repr(u8)]pub enum MessageType {Authentication = 1,// ...}fn main() {let n = MessageType::Authentication as u8;println!("{}", n);}
英文:
You will have to define the value of each variant manually, and use as instead of .into() for conversion, since Into<u8> is not implemented by MessageType:
#[repr(u8)]pub enum MessageType {Authentication = 1,// ...}fn main() {let n = MessageType::Authentication as u8;println!("{}", n);}
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