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| author | dos-reis <gdr@axiomatics.org> | 2013-05-17 00:48:29 +0000 |
|---|---|---|
| committer | dos-reis <gdr@axiomatics.org> | 2013-05-17 00:48:29 +0000 |
| commit | 1d241c403c1d8e0b3f41093729efd967335c4b93 (patch) | |
| tree | cc1e691489276a5d94bd7cafde17398207c84cca /src/algebra | |
| parent | a77534307be15ee6d85fbc31cc2717cae874d209 (diff) | |
| download | open-axiom-1d241c403c1d8e0b3f41093729efd967335c4b93.tar.gz | |
* algebra/aggcat.spad.pamphlet (AssociationListAggregate) [assoc]:
Change return type to instance of Maybe.
* algebra/list.spad.pamphle (AssociationList): Reflect change.
Diffstat (limited to 'src/algebra')
| -rw-r--r-- | src/algebra/aggcat.spad.pamphlet | 4 | ||||
| -rw-r--r-- | src/algebra/list.spad.pamphlet | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/src/algebra/aggcat.spad.pamphlet b/src/algebra/aggcat.spad.pamphlet index 83667f77..576a5a24 100644 --- a/src/algebra/aggcat.spad.pamphlet +++ b/src/algebra/aggcat.spad.pamphlet @@ -2599,9 +2599,9 @@ import ListAggregate ++ searching for a key is a linear operation. AssociationListAggregate(Key:SetCategory,Entry:SetCategory): Category == Join(TableAggregate(Key, Entry), ListAggregate Record(key:Key,entry:Entry)) with - assoc: (Key, %) -> Union(Record(key:Key,entry:Entry), "failed") + assoc: (Key, %) -> Maybe Record(key:Key,entry:Entry) ++ assoc(k,u) returns the element x in association list u stored - ++ with key k, or "failed" if u has no key k. + ++ with key k, or \spad{nothing} if u has no key k. @ diff --git a/src/algebra/list.spad.pamphlet b/src/algebra/list.spad.pamphlet index 9f0cc282..78cb7133 100644 --- a/src/algebra/list.spad.pamphlet +++ b/src/algebra/list.spad.pamphlet @@ -506,8 +506,8 @@ AssociationList(Key:SetCategory, Entry:SetCategory): assoc(k, t) == for r in deref t repeat - k = r.key => return r - "failed" + k = r.key => return just r + nothing setelt(t:%, k:Key, e:Entry) == (r := assoc(k, t)) case Pair => (r::Pair).entry := e |