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-rw-r--r--meap/meap-code/ch1/ch1-animals-specialization.rs47
1 files changed, 47 insertions, 0 deletions
diff --git a/meap/meap-code/ch1/ch1-animals-specialization.rs b/meap/meap-code/ch1/ch1-animals-specialization.rs
new file mode 100644
index 0000000..49fc0eb
--- /dev/null
+++ b/meap/meap-code/ch1/ch1-animals-specialization.rs
@@ -0,0 +1,47 @@
+struct Animal {
+ age: i32,
+}
+
+type Cat = Animal;
+type Dog = Animal;
+type LoudDog = Dog;
+
+trait Talk {
+ fn talk(&self) -> ();
+}
+
+impl Talk for Animal {
+ default fn talk(&self) { // note the use of the default
+ println!("<silence>");
+ }
+}
+
+impl Talk for Cat {
+ fn talk(&self) {
+ println!("Meow");
+ }
+}
+
+impl Talk for Dog {
+ fn talk(&self) {
+ println!("Woof!");
+ }
+}
+
+impl Talk for LoudDog {
+ fn talk(&self) {
+ println!("WOOF!!");
+ }
+}
+
+
+
+fn main() {
+ let fluffy = Cat(Animal { age: 4 });
+ let max = Dog(Animal { age: 2 });
+ let neighbours_dog = LoudDog(Animal { age: 7 });
+
+ fluffy.talk();
+ max.talk();
+ neighbours_dog.talk();
+}