16 lines
404 B
OCaml
16 lines
404 B
OCaml
(** Purely functional queue, implemented as a pair of lists. *)
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type 'a queue = { front : 'a list; back : 'a list }
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type 'a result =
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| Error of string
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| Success of 'a
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(** Purely functional stack. *)
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type 'a stack =
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| Empty
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| Stacked of 'a * 'a stack
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(* A purely functional tree with arbitrarily many branches at each node. *)
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type 'a tree =
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| Leaf
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| Branch of 'a * 'a tree list |