rust - 如何将 enum_dispatch 的 try_into() 与 Mutex 一起使用？

Question

我正在使用enum_dispatch板条箱并想将我的一些MyBehaviorEnums 包装在Mutex. 我可以Mutex<MyBehaviorEnum>通过 using调用特征方法.lock().unwrap()，但是当我尝试将枚举转换回实现者时，出现错误。

use core::convert::TryInto;
use enum_dispatch::enum_dispatch;
use std::sync::Mutex;

struct MyImplementorA {}

impl MyBehavior for MyImplementorA {
    fn my_trait_method(&self) {}
}

struct MyImplementorB {}

impl MyBehavior for MyImplementorB {
    fn my_trait_method(&self) {}
}

#[enum_dispatch]
enum MyBehaviorEnum {
    MyImplementorA,
    MyImplementorB,
}

#[enum_dispatch(MyBehaviorEnum)]
trait MyBehavior {
    fn my_trait_method(&self);
}

fn main() {
    let a: MyBehaviorEnum = MyImplementorA {}.into();
    let my_wrapped = Mutex::new(a);
    my_wrapped.lock().unwrap().my_trait_method();
    let convert_back_to_implementor: Result<MyImplementorA, _> = my_wrapped.lock().unwrap().try_into();
}

给出错误：

error[E0277]: the trait bound `MyImplementorA: From<MutexGuard<'_, MyBehaviorEnum>>` is not satisfied
  --> src\main.rs:33:93
   |
33 |     let convert_back_to_implementor: Result<MyImplementorA, _> = my_wrapped.lock().unwrap().try_into();
   |                                                                                             ^^^^^^^^ the trait `From<MutexGuard<'_, MyBehaviorEnum>>` is not implemented for `MyImplementorA`
   |
   = note: required because of the requirements on the impl of `Into<MyImplementorA>` for `MutexGuard<'_, MyBehaviorEnum>`
   = note: required because of the requirements on the impl of `TryFrom<MutexGuard<'_, MyBehaviorEnum>>` for `MyImplementorA`
   = note: required because of the requirements on the impl of `TryInto<MyImplementorA>` for `MutexGuard<'_, MyBehaviorEnum>`

是否有解决此问题的方法可以让我将其转换MutexGuard为MyImplementorA？

标签： rust