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* object.c (rb_obj_hash): Added note that the hash value is not

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deterministic on Marc-Andre's suggestion.  Expanded description of
  the purpose of the hash method.  [Bug #6068]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34769 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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drbrain 2012-02-23 22:23:58 +00:00
parent f51ad04324
commit 9802ce8bd2
2 changed files with 16 additions and 7 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
Fri Feb 24 06:21:15 2012 Eric Hodel <drbrain@segment7.net>
* 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]
Thu Feb 23 23:01:21 2012 Tanaka Akira <akr@fsij.org>
* ext/dbm/extconf.rb: unused macro removed.

17
object.c
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@ -101,14 +101,17 @@ rb_obj_equal(VALUE obj1, VALUE obj2)
}
/*
* Generates a <code>Fixnum</code> hash value for this object.
* This function must have the property that a.eql?(b) implies
* a.hash <code>==</code> b.hash.
* The hash value is used by class <code>Hash</code>.
* Any hash value that exceeds the capacity of a <code>Fixnum</code> will be
* truncated before being used.
* Generates a Fixnum hash value for this object. This function must have the
* property that <code>a.eql?(b)<code> implies <code>a.hash == b.hash</code>.
*
* "waffle".hash #=> -910576647
* The hash value is used along with #eql? by the Hash class to determine if
* two objects reference the same hash key. Any hash value that exceeds the
* capacity of a Fixnum will be truncated before being used.
*
* The hash value for an object may not be identical across invocations or
* implementations of ruby. If you need a stable identifier across ruby
* invocations and implementations you will need to generate one with a custom
* method.
*/
VALUE
rb_obj_hash(VALUE obj)