31 lines
668 B
OCaml
Executable File
31 lines
668 B
OCaml
Executable File
open General
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let pop (st : 'a stack) : 'a option * 'a stack =
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match st with
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| Empty -> (None, Empty)
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| Stacked (x, xs) -> (Some x, xs)
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let push (a : 'a) (st : 'a stack) : 'a stack =
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Stacked (a, st)
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let peek (st : 'a stack) : 'a option =
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match st with
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| Empty -> None
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| Stacked (x, xs) -> Some x
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let empty : 'a stack = Empty
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let rec height_helper (height : int) (st : 'a stack) =
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match st with
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| Empty -> height
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| Stacked (x, xs) -> height_helper (Int.(height + 1)) xs
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let height (st : 'a stack) : int =
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height_helper 0 st
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let is_empty (st : 'a stack) =
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match st with
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| Empty -> true
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| Stacked _ -> false
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