gistfile1.txt

pub trait BaseIter<A> {                                                                                                                                                       
    pure fn each(&self, blk: fn(v: &A) -> bool);                                                                                                                              
    pure fn size_hint(&self) -> Option<uint>;                                                                                                                                 
}                                                                                                                                                                             
                                                                                                                                                                              
pub trait ExtendedIter<A> : BaseIter<A> {                                                                                                                                     
    pure fn eachi(&self, blk: fn(uint, v: &A) -> bool) {                                                                                                                      
        let mut i = 0;                                                                                                                                                        
        // Call a method defined by BaseIter                                                                                                                                  
        for self.each |a| {                                                                                                                                                   
            if !blk(i, a) { break; }                                                                                                                                          
            i += 1;                                                                                                                                                           
        }                                                                                                                                                                     
    }                                                                                                                                                                         
}