- 生命周期
用 Fn 特征解决闭包生命周期
fn main() {
let x = 3;
let closure_slision = fun(|x: &i32| -> &i32 {
println!("{}", x);
x
});
closure_slision(&x);
}
fn fun<T, F: Fn(&T) -> &T>(f: F) -> F {
f
}
fn main() {
let x = 3;
let closure_slision = fun(|x: &i32| -> &i32 {
println!("{}", x);
x
});
closure_slision(&x);
}
fn fun<T, F: Fn(&T) -> &T>(f: F) -> F {
f
}