Singly-linked list/Element definition: Difference between revisions
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=={{header|ATS}}== |
=={{header|ATS}}== |
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<lang ATS>(* The Rosetta Code garbage-collected list type can contain |
<lang ATS>(* The Rosetta Code garbage-collected list type can contain any |
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t@ype. (The ‘@’ means it doesn’t have to be the size of a |
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pointer. You can read {0 <= n} as ‘for all non-negative n’. *) |
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non-negative n’. *) |
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datatype rclist_t (t : t@ype+, n : int) = |
datatype rclist_t (t : t@ype+, n : int) = |
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| rclist_t_nil (t, 0) |
| rclist_t_nil (t, 0) |
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| {0 <= n} rclist_t_cons (t, n + 1) of rclist_t (t, n) |
| {0 <= n} rclist_t_cons (t, n + 1) of rclist_t (t, n) |
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(* The Rosetta Code linear list type can contain any vt@ype |
(* The Rosetta Code linear list type can contain any vt@ype and so is |
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more general. *) |
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dataviewtype rclist_vt (vt : vt@ype+, n : int) = |
dataviewtype rclist_vt (vt : vt@ype+, n : int) = |
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| rclist_vt_nil (vt, 0) |
| rclist_vt_nil (vt, 0) |
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