bugMIT/GNU Scheme - Bugs: bug #28370, hash tables should be strong...


bug #28370: hash tables should be strong unless explicitly desired otherwise

Submitter:  Taylor R. Campbell <riastradh>
Submitted:  Mon 21 Dec 2009 11:34:39 PM UTC
Category:  runtime Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Suboptimal behavior
Status:  None Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Open
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Thu 30 May 2013 09:48:59 PM UTC, comment #2: 

Not until we have a reasonable story for namespacing so that applications can ask for the hash-table-v2 API rather than just live in a child of the system global environment...

Taylor R. Campbell <riastradh>
Group Member
Thu 30 May 2013 04:42:11 PM UTC, comment #1: 

When CAN we change MAKE-EQ-HASH-TABLE to return strong hash tables?

Matt Birkholz <mhb>
Group Member
Mon 21 Dec 2009 11:34:39 PM UTC, original submission:  

If one asks for a hash table, one should not get a weak hash table unless one explicitly asked for it.  MAKE-EQ-HASH-TABLE and MAKE-EQV-HASH-TABLE currently confusingly yield strong hash tables, as a consequence of which only a small fraction of their uses in MIT Scheme actually needed key-weak hash tables, while for a much large fraction, using key-weak hash tables was either confusing or incorrect.  We can't change the semantics of these two procedures immediately, however, because what they do now is what they have been documented to do.

See discussion at <http://lists.gnu.org/archive/html/mit-scheme-devel/2009-12/msg00032.html>.  Use of MAKE-EQ-HASH-TABLE was eradicated from MIT Scheme in commit da6830c165b2540d93d1e3f1b31b6f0470392868, replaced by use of the more specific constructors MAKE-STRONG-EQ-HASH-TABLE and MAKE-WEAK-EQ-HASH-TABLE.

Taylor R. Campbell <riastradh>
Group Member


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