Created
January 31, 2012 06:44
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PFDS ListStack
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| object ListStack { | |
| def apply[T] : ListStack[T] = new ListStack[T](List()) | |
| } | |
| class ListStack[T] private (val l: List[T]) extends Stack[T] { | |
| def isEmpty = l.isEmpty | |
| def cons[U >: T](x: U) = new ListStack(x::l) | |
| def head = l.head | |
| def tail = new ListStack(l.tail) | |
| } |
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