X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/488127b6522769f834f8df4ea7c406396782d7e8..4cac8138d63e49c60d101bee79b9e60644b3de0a:/src/part03.rs

diff --git a/src/part03.rs b/src/part03.rs
index 44431e6..b81bbc3 100644
--- a/src/part03.rs
+++ b/src/part03.rs
@@ -99,9 +99,10 @@ pub fn main() {
     min.print();                                                    /*@*/
 }
 
-// **Exercise 03.1**: Define a trait `Print` to write a generic version of
-// `SomethingOrNothing::print`.
-// Implement that trait for `i32`, and change the code above to use it.
+// **Exercise 03.1**: The goal is to write a generic version of `SomethingOrNothing::print`.
+// To this end, define a trait `Print` that provides (simple) generic printing, and implement
+// that trait for `i32`. Then define `SomethingOrNothing::print2` to use that trait, and change
+// `main` above to use the new generic `print2` function.
 // I will again provide a skeleton for this solution. It also shows how to attach bounds to generic
 // implementations (just compare it to the `impl` block from the previous exercise).
 // You can read this as "For all types `T` satisfying the `Print` trait, I provide an implementation
@@ -114,6 +115,9 @@ pub fn main() {
 pub trait Print {
     /* Add things here */
 }
+impl Print for i32 {
+    /* Add things here */
+}
 impl<T: Print> SomethingOrNothing<T> {
     fn print2(self) {
         unimplemented!()