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7f918cf1 CE |
1 | (* Copyright (C) 1999-2006 Henry Cejtin, Matthew Fluet, Suresh |
2 | * Jagannathan, and Stephen Weeks. | |
3 | * Copyright (C) 1997-2000 NEC Research Institute. | |
4 | * | |
5 | * MLton is released under a BSD-style license. | |
6 | * See the file MLton-LICENSE for details. | |
7 | *) | |
8 | ||
9 | structure Natural = | |
10 | struct | |
11 | fun foldStartStop (start, stop, b, f) = | |
12 | if start > stop | |
13 | then raise Subscript | |
14 | else | |
15 | let | |
16 | fun loop (i, b) = | |
17 | if i >= stop then b | |
18 | else loop (i + 1, f (i, b)) | |
19 | in loop (start, b) | |
20 | end | |
21 | ||
22 | fun foreachStartStop (start, stop, f) = | |
23 | foldStartStop (start, stop, (), fn (i, ()) => f i) | |
24 | ||
25 | fun foreach (n, f) = foreachStartStop (0, n, f) | |
26 | end |