英文:
Map an error to a vector of errors in Rust's `Result`
问题
Here is the translated code:
我有以下的设置```rustfn get_result() -> Result<(), Vec<String>> {make_error()?;Ok(())}fn make_error() -> Result<(), String> {Err("error".to_string())}
显然，这段代码无法编译，因为 T != Vec<T>。我得到的错误是
trait 'From<String>' 未实现于 'Vec<String>'。不幸的是，这个错误无法解决，因为我不能为我的 crate 外部的类型实现 crate 外部的特性。
我想出的解决方案如下，但显然远非优雅。是否有更好的选择？
trait Vectorize<T, E> {fn err_to_vec(self) -> Result<T, Vec<E>>;}impl<T, E> Vectorize<T, E> for Result<T, E> {fn err_to_vec(self) -> Result<T, Vec<E>> {match self {Ok(ok) => Ok(ok),Err(err) => Err(vec![err])}}}
希望这对您有所帮助。
英文:
I have the following setup
fn get_result() -> Result<(), Vec<String>> {make_error()?;Ok(())}fn make_error() -> Result<(), String> {Err("error".to_string())}
Clearly, this code does not compile because T != Vec<T>. The error I get is
the trait 'From<String>' is not implemented for 'Vec<String>'. Unfortunately, this error is not actionable, as I can't implement traits external to my crate for types external to my crate.
The solution I have come up with is below, but it is clearly far from elegant. Are there better options?
trait Vectorize<T, E> {fn err_to_vec(self) -> Result<T, Vec<E>>;}impl<T, E> Vectorize<T, E> for Result<T, E> {fn err_to_vec(self) -> Result<T, Vec<E>> {match self {Ok(ok) => Ok(ok),Err(err) => Err(vec![err])}}}
答案1
得分: 2
使用 map_err：
fn get_result() -> Result<(), Vec<String>> {make_error().map_err(|e| vec![e])?;Ok(())}fn make_error() -> Result<(), String> {Err("error".to_string())}
英文:
Use map_err:
fn get_result() -> Result<(), Vec<String>> {make_error().map_err (|e| vec![e])?;Ok(())}fn make_error() -> Result<(), String> {Err("error".to_string())}
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