fromstr trait huh

1 files changed, 15 insertions, 0 deletions

diff --git a/src/bin/day2.rs b/src/bin/day2.rs
index a007159..8c5c54d 100644
--- a/src/bin/day2.rs
+++ b/src/bin/day2.rs
@@ -1,9 +1,21 @@
 #![feature(test)]
+use std::str::FromStr;
 use std::error::Error;
 
 const COLORS: [&str; 3] = ["red", "green", "blue"];
 const AMOUNT: [u32; 3] = [12, 13, 14];
 
+struct HelloWorld {
+    msg: String,
+}
+
+impl FromStr for HelloWorld {
+    type Err = std::convert::Infallible;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(HelloWorld { msg: String::from(s), })
+    }
+}
+
 // NOTE: probably should just panic, filter_mapping doesn't make much sense if you need the input to be correct.
 fn main() -> Result<(), Box<dyn Error>> {
     let file = std::fs::read_to_string("input/2/in.txt")?;
@@ -61,6 +73,9 @@ fn main() -> Result<(), Box<dyn Error>> {
         .sum();
     dbg!(part2);
 
+    let v: HelloWorld = "hi".parse()?;
+    println!("msg from impl: {}", v.msg);
+
     Ok(())
 }