我可以针对实现Pattern的通用类型创建匹配吗? [英] Can I create a match against a generic type that implements Pattern?
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问题描述
我认为,如果我能算出生命周期表示法,这可能会奏效,我错了吗?
I think this might work if I can work out the lifetime notation, am I wrong?
pub fn from<T:Pattern>(from: T) -> Result<Tag, &'static str> {
match from {
'A'|"A" => Ok(Tag::ChA),
'B'|"B" => Ok(Tag::ChB),
'C'|"C" => Ok(Tag::ChC),
'D'|"D" => Ok(Tag::ChD),
'T'|"Tmpr" => Ok(Tag::Tmpr),
'Y'|"Batt" => Ok(Tag::Batt),
'L'|"Acc" => Ok(Tag::Acc),
_ => Err("Error: unknown channel"),
}
}
推荐答案
匹配仅适用于具体类型,因此答案是否定的.除了我们可以调用 Pattern
中定义的方法(用于搜索字符串)之外,这里对 T
的类型一无所知.
Matching only works with concrete types, so the answer is no. Nothing is known about the type T
here except that we can call the methods defined in Pattern
on it (which are for searching in a string).
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