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rustlings/solutions/16_lifetimes/lifetimes2.rs

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2024-06-27 07:24:27 -04:00
fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
if x.len() > y.len() {
x
} else {
y
}
}
fn main() {
let string1 = String::from("long string is long");
// Solution1: You can move `strings2` out of the inner block so that it is
// not dropped before the print statement.
let string2 = String::from("xyz");
let result;
{
result = longest(&string1, &string2);
}
println!("The longest string is '{result}'");
// `string2` dropped at the end of the function.
// =========================================================================
let string1 = String::from("long string is long");
let result;
{
let string2 = String::from("xyz");
result = longest(&string1, &string2);
// Solution2: You can move the print statement into the inner block so
// that it is executed before `string2` is dropped.
println!("The longest string is '{result}'");
// `string2` dropped here (end of the inner scope).
}
}