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* hash.c (rb_hash_invert): [DOC] more examples.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53818 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2016-02-13 12:45:59 +00:00
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ChangeLog
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@ -1,3 +1,7 @@
Sat Feb 13 21:44:58 2016 Tanaka Akira <akr@fsij.org>
* hash.c (rb_hash_invert): [DOC] more examples.
Sat Feb 13 17:30:49 2016 Nobuyoshi Nakada <nobu@ruby-lang.org>
* lib/uri/generic.rb (URI::Generic#find_proxy): support CIDR in

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hash.c
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@ -2217,6 +2217,22 @@ rb_hash_invert_i(VALUE key, VALUE value, VALUE hash)
* h = { "n" => 100, "m" => 100, "y" => 300, "d" => 200, "a" => 0 }
* h.invert #=> {0=>"a", 100=>"m", 200=>"d", 300=>"y"}
*
* If there is no key with the same value, Hash#invert is involutive.
*
* h = { a: 1, b: 3, c: 4 }
* h.invert.invert == h #=> true
*
* The condition, no key with the same value, can be tested by comparing
* the size of inverted hash.
*
* # no key with the same value
* h = { a: 1, b: 3, c: 4 }
* h.size == h.invert.size #=> true
*
* # two (or more) keys has the same value
* h = { a: 1, b: 3, c: 1 }
* h.size == h.invert.size #=> false
*
*/
static VALUE