blob: cf14ff475bafb8c615ee1e2abbf9439a0ab7398e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
abstract class AbsIterator {
type T
def hasNext: boolean
def next: T
}
trait RichIterator extends AbsIterator {
def foreach(f: T => unit): unit =
while (hasNext) f(next)
}
class StringIterator(s: String) extends AbsIterator {
type T = char
private var i = 0
def hasNext = i < s.length()
def next = { val x = s.charAt(i); i = i + 1; Console.println("next: " + x); x }
}
trait SyncIterator extends AbsIterator {
abstract override def hasNext: boolean =
synchronized(super.hasNext)
abstract override def next: T =
synchronized {
Console.println("<sync>"); val x = super.next; Console.println("</sync>"); x
}
}
trait LoggedIterator extends AbsIterator {
abstract override def next: T = {
val x = super.next; Console.println("log: " + x); x
}
}
class Iter2(s: String) extends StringIterator(s)
with SyncIterator with LoggedIterator;
object Test {
def main(args: Array[String]): unit = {
class Iter extends StringIterator(args(0)) with RichIterator with SyncIterator with LoggedIterator
val iter = new Iter
iter foreach Console.println
}
}
|