Bug #6068: String::Hash documentation clarification

• Status: Closed
• Assignee: drbrain (Eric Hodel)
• Target version: -
• ruby -v: ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-linux]

modified documentation for String::hash to clarify that results are not conistent across sessions and advice for if that behavior is desired

[marcandre (Marc-Andre Lafortune)]

I'm not sure that all implementations have to return hash codes that differ from one run to the other. I would also modify Object#hash, as all hashes in CRuby are random seeded, not just String. I'd recommend adding the following line to Object#hash:

No other assumption can be made on hash values; in particular they may vary between sessions or implementations.

[drbrain (Eric Hodel)]

• Status changed from Open to Closed
• % Done changed from 0 to 100

This issue was solved with changeset r34769.
Daniel, thank you for reporting this issue.
Your contribution to Ruby is greatly appreciated.
May Ruby be with you.

---

• object.c (rb_obj_hash): Added note that the hash value is not
  deterministic on Marc-Andre's suggestion. Expanded description of
  the purpose of the hash method. [Bug #6068]

[drbrain (Eric Hodel)]

Daniel, I couldn't use your patch as it was not line-wrapped to 80 columns and was too-specific to String. As Marc-Andre pointed out, the randomization behavior applies to Fixnum, Hash, String, Symbol, Array, etc., so I applied a patch based on his suggestion.