gistfile1.rs

trait Visitor<T>{
	fn visit(&self, t: T);
}
struct PrintVisitor;
impl PrintVisitor {
	fn print(&self, s: ~str){
		println(s);
	}
}
impl Visitor<~str> for PrintVisitor {
	fn visit(&self, s: ~str){
		println(s+" World");
	}
}


struct SomeObject;
impl SomeObject {
	fn do_sth<'r>(&self, v: &'r Visitor<~str>, s: ~str){
		v.visit(s);
	}
}

fn main(){
let v = &PrintVisitor;
let o = SomeObject;

o.do_sth(v as &Visitor<~str>, ~"Hello"); // do I really have to cast?
}