Casting interface implemented

16_interfaces/casting.v

@@ -0,0 +1,41 @@
+
+
+struct Dog{
+	breed string
+	speak() string
+}
+
+fn (d Dog) speak() string {
+	println('Woof')
+}
+
+
+struct Cat{
+	breed string
+	speak() string
+}
+
+fn (c Cat) speak() string{
+	println('Meow')
+}
+
+interface Something{}
+
+
+fn announce(s Something){
+	if s is Dog {
+		println('a ${s.breed] dog')
+	}else if s is Cat{
+		println('a cat speaks ${s.speak()}')
+	}else {
+		println('something else')
+	}
+}
+
+fn main(){
+	dog := Dog{'Leonberger'}
+	cat := Cat{'Siamese'}
+
+	announce(dog)
+	announce(cat)
+}

16_interfaces/interfaces.v

@@ -1,4 +1,4 @@
-module main
+
 
 interface Foo{
 	write(string) string