From 7efccc36b4c26c444eab2531b6139190af569d6f Mon Sep 17 00:00:00 2001 From: mo8it Date: Thu, 27 Jun 2024 13:24:21 +0200 Subject: lifetimes1 solution --- solutions/16_lifetimes/lifetimes1.rs | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) (limited to 'solutions') diff --git a/solutions/16_lifetimes/lifetimes1.rs b/solutions/16_lifetimes/lifetimes1.rs index 4e18198..ca7b688 100644 --- a/solutions/16_lifetimes/lifetimes1.rs +++ b/solutions/16_lifetimes/lifetimes1.rs @@ -1 +1,28 @@ -// Solutions will be available before the stable release. Thank you for testing the beta version 🥰 +// The Rust compiler needs to know how to check whether supplied references are +// valid, so that it can let the programmer know if a reference is at risk of +// going out of scope before it is used. Remember, references are borrows and do +// not own their own data. What if their owner goes out of scope? + +fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { + // ^^^^ ^^ ^^ ^^ + if x.len() > y.len() { + x + } else { + y + } +} + +fn main() { + // You can optionally experiment here. +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_longest() { + assert_eq!(longest("abcd", "123"), "abcd"); + assert_eq!(longest("abc", "1234"), "1234"); + } +} -- cgit v1.2.3