show some more code in the workspace

[rust-101.git] / workspace / src / part07.rs

diff --git a/workspace/src/part07.rs b/workspace/src/part07.rs
index 6b779ccf929b2cff2e6e9b5beb5d38c1b27434d9..75bd0cca93c5fd006083406936ea00d97fd1e649 100644 (file)
--- a/workspace/src/part07.rs
+++ b/workspace/src/part07.rs
@@ -11,14 +11,17 @@ pub trait Minimum {
 pub fn vec_min<T: Minimum>(v: &Vec<T>) -> Option<&T> {
     let mut min: Option<&T> = None;
     for e in v {
-        unimplemented!()
+        min = Some(match min {
+            None => e,
+            Some(n) => n.min(e)
+        });
     }
     min
 }
 
 // **Exercise 07.1**: For our `vec_min` to be usable with `BigInt`, you will have to provide an implementation of
 // `Minimum`. You should be able to pretty much copy the code you wrote for exercise 06.1. You should *not*
-// make any copies!
+// make any copies of `BigInt`!
 impl Minimum for BigInt {
     fn min<'a>(&'a self, other: &'a Self) -> &'a Self {
         unimplemented!()