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author | Adam Chlipala <adamc@hcoop.net> | 2008-01-26 16:02:47 -0500 |
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committer | Adam Chlipala <adamc@hcoop.net> | 2008-01-26 16:02:47 -0500 |
commit | e7e2ffc58a4f120801ae69217032948e511af213 (patch) | |
tree | 347ed14f320df53657cab27568e54eac47107d22 /src/list_util.sml | |
parent | 95beeda12defe36c4d4df42d3dee3bd753e19ff5 (diff) |
Elaborating files
Diffstat (limited to 'src/list_util.sml')
-rw-r--r-- | src/list_util.sml | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/list_util.sml b/src/list_util.sml new file mode 100644 index 00000000..fdc1ac55 --- /dev/null +++ b/src/list_util.sml @@ -0,0 +1,45 @@ +(* Copyright (c) 2008, Adam Chlipala + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * - The names of contributors may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + *) + +structure ListUtil :> LIST_UTIL = struct + +fun mapfoldl f i = + let + fun mf s ls' ls = + case ls of + nil => (s, rev ls') + | h :: t => + let + val (s, h') = f (h, s) + in + mf s (h' :: ls') t + end + in + mf i [] + end + +end |