如何使用结构和隐式生命周期来推断实现的适当生命周期？

Question

如何解决此错误？当我在impl中使用“匿名生存期”时，我到底要告诉编译器什么？

struct LineHandlerInfo<'a> {
    label: &'a str,
    match_literal: &'a str,
    f: fn(&str) -> Option<&str>,
}

struct Game<'a> {
    handlers: Vec<LineHandlerInfo<'a>>,
}

impl Game<'_> {
    fn match_str<'a>(
        &'a mut self,
        label: &'a str,
        match_literal: &'a str,
        mut f: fn(&str) -> Option<&str>,
    ) {
        let mut lh = LineHandlerInfo {
            label,
            match_literal,
            f,
        };
        self.handlers.push(lh);
    }
}

fn main() {
    let mut g = Game {
        handlers: Vec::new(),
    };
    g.match_str("echo hello", "hello", |s| {
        println!("{}", s);
        None
    });
}

当我尝试编译时，出现以下错误：

error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
  --> src/main.rs:18:22
   |
18 |         let mut lh = LineHandlerInfo {
   |                      ^^^^^^^^^^^^^^^
   |
note: first, the lifetime cannot outlive the lifetime 'a as defined on the method body at 12:18...
  --> src/main.rs:12:18
   |
12 |     fn match_str<'a>(
   |                  ^^
note: ...so that reference does not outlive borrowed content
  --> src/main.rs:19:13
   |
19 |             label,
   |             ^^^^^
note: but, the lifetime must be valid for the lifetime '_ as defined on the impl at 11:11...
  --> src/main.rs:11:11
   |
11 | impl Game<'_> {
   |           ^^
   = note: ...so that the expression is assignable:
           expected LineHandlerInfo<'_>
              found LineHandlerInfo<'_>
如何解决此错误，当我已经在结构上具有生存期时，当我在impl Game上指定生存期时，该告诉编译器什么？

如何解决此错误？当我在impl中使用“匿名生存期”时，我到底要告诉编译器什么？ struct LineHandlerInfo {标签：＆'a str，match_literal：＆'a ...

Answer 1

我该如何解决此错误？