我希望能够使以下代码编译通过:
struct Provider {}
impl Provider {
fn get_string<'a>(&'a self) -> &'a str { "this is a string" }
}
fn main() {
let provider = Provider{};
let mut vec: Vec<&str> = Vec::new();
// PROBLEM: how do I say that this reference s here
// needs to live as long as vec?
let fun = |s: &str| {
vec.push(s);
};
fun(provider.get_string());
}
我收到的编译错误如下:
error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
--> src/main.rs:9:22
|
9 | let mut vec: Vec<&str> = Vec::new();
| ^^^^
|
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the block at 11:24...
--> src/main.rs:11:25
|
11| let fun = |s: &str| {
| ^
note: ...so that reference does not outlive borrowed content
--> src/main.rs:12:18
|
12| vec.push(s);
| ^
note: but, the lifetime must be valid for the block suffix following statement 2 at 13:6...
--> src/main.rs:13:7
|
13| };
| ^
note: ...so that variable is valid at time of its declaration
--> src/main.rs:11:9
|
11| let fun = |s: &str| {
| ^^^
'provider
来表示“那个家伙的寿命在那里”。 - Matthieu M.s
的类型。 - bennofs