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Posted to dev@thrift.apache.org by "Bryan Duxbury (JIRA)" <ji...@apache.org> on 2008/12/11 23:56:44 UTC
[jira] Assigned: (THRIFT-231) Ruby generated structs lack a hash
method, and thus cannot be used as map keys or set members
[ https://issues.apache.org/jira/browse/THRIFT-231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bryan Duxbury reassigned THRIFT-231:
------------------------------------
Assignee: Bryan Duxbury
> Ruby generated structs lack a hash method, and thus cannot be used as map keys or set members
> ---------------------------------------------------------------------------------------------
>
> Key: THRIFT-231
> URL: https://issues.apache.org/jira/browse/THRIFT-231
> Project: Thrift
> Issue Type: Bug
> Components: Compiler (Ruby), Library (Ruby)
> Reporter: Bryan Duxbury
> Assignee: Bryan Duxbury
>
> Since generated structs don't define a hash method in Ruby, it defaults to a unique number every time. This means that even if two objects have equal values, they will not have equal hashcodes. As a result, if you try to create a set of these structs and subsequently attempt to test membership on an equal struct, it'll always return false. The same problem prevents structs from being used as map keys.
> At the very least, we should define a hash method that always returns 0 and leave it up to the chaining to resolve the problem. A slightly more appropriate move would be to have the hashcode of a struct be the composition of its member values.
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