* enum.c (enum_find): mention about ifnone argument. [ruby-talk:90003]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5474 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

enum.c

@@ -92,12 +92,13 @@ find_i(i, memo)
 
 /*
  *  call-seq:
- *     enum.detect {| obj | block }  => obj or nil
- *     enum.find   {| obj | block }  => obj or nil
+ *     enum.detect(ifnone = nil) {| obj | block }  => obj or nil
+ *     enum.find(ifnone = nil)   {| obj | block }  => obj or nil
  *  
  *  Passes each entry in <i>enum</i> to <em>block</em>. Returns the
- *  first for which <em>block</em> is not <code>false</code>. Returns
- *  <code>nil</code> if no object matches.
+ *  first for which <em>block</em> is not <code>false</code>.  If no
+ *  object matches, calls <i>ifnone</i> and returns its result when it
+ *  is specified, or returns <code>nil</code>
  *     
  *     (1..10).detect  {|i| i % 5 == 0 and i % 7 == 0 }   #=> nil
  *     (1..100).detect {|i| i % 5 == 0 and i % 7 == 0 }   #=> 35