X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/375923e203d323dadc639434ebc1f29530f4ac2a..4cac8138d63e49c60d101bee79b9e60644b3de0a:/src/part03.rs

diff --git a/src/part03.rs b/src/part03.rs
index 2a5eb16..b81bbc3 100644
--- a/src/part03.rs
+++ b/src/part03.rs
@@ -30,7 +30,7 @@ fn read_vec() -> Vec<i32> {
     //@ concurrently, that also reads from standard input? The result would be a mess. Hence
     //@ Rust requires us to `lock` standard input if we want to perform large operations on
     //@ it. (See [the documentation](https://doc.rust-lang.org/stable/std/io/struct.Stdin.html) for
-    //@ more details.) 
+    //@ more details.)
     for line in stdin.lock().lines() {
         // Rust's type for (dynamic, growable) strings is `String`. However, our variable `line`
         // here is not yet of that type: It has type `io::Result<String>`.
@@ -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!()