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subtype polymorphism possible in Gideros? — Gideros Forum
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    subtype polymorphism possible in Gideros?

    grotlygrotly Member
    edited September 2014 in Code snippets
    How can I achieve in Gideros the same "effect" as in the pseudocode below? Is it even possible?
    abstract class Animal {
    abstract String talk();
}
 
class Cat extends Animal {
    String talk() {
        return "Meow!";
    }
}
 
class Dog extends Animal {
    String talk() {
        return "Woof!";
    }
}
 
void letsHear(Animal a) {
    println(a.talk());
}
 
void main() {
    letsHear(new Cat());
    letsHear(new Dog());
}
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    Comments

    • asakharovasakharov Member
      edited September 2014 Accepted Answer 
      Animal = Core.class()
Cat = Core.class(Animal)
Dog = Core.class(Animal)
 
function Animal:talk()
  error("Override in derrived class!")
end
 
function Cat:talk()
  return "Meow!"
end
 
function Dog:talk()
  return "Woof!"
end
 
function letsHear(a)
    print(a:talk())
end
 
letsHear(Cat.new())
letsHear(Dog.new())
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    • grotlygrotly Member
      Thanks, I wasn't sure if we can derive from our own classes. In the meantime, I also found the answer here

      http://giderosmobile.com/forum/discussion/15/oop-in-gideros/p1

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