生存期間指定子
2022/2/17 23:01:00
&'
2022/2/20 23:16:00
Rustでは関数で作成した変数への参照を戻り値で渡すことはできない
2022/2/17 23:15:00
fn main() {
let reference_to_nothing = dangle();
}
fn dangle() -> &String {
let s = String::from("hello");
&s
}
error[E0106]: missing lifetime specifier
--> src\main.rs:5:16
|
5 | fn dangle() -> &String {
| ^ expected named lifetime parameter
|
= help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime
|
5 | fn dangle() -> &'static String {
| ~~~~~~~~