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Feature #12084

closed

`Class#instance`

Added by sawa (Tsuyoshi Sawada) about 8 years ago. Updated over 1 year ago.

Status:
Closed
Assignee:
-
Target version:
-
[ruby-core:73878]

Description

For meta-programming/debugging purposes, I would like to request the inverse of Object#singleton_class. Namely, a method that is called on a class that is a singleton class, and returns the object it is a singleton of. Since the Singleton module in the standard library http://ruby-doc.org/stdlib-2.3.0/libdoc/singleton/rdoc/Singleton.html assigns the method name instance to such classes, I think Class#instance should be the name for such feature.

Array.singleton_class.instance # => Array
"foo".singleton_class.instance # => "foo"

When the receiver is a class but is not a singleton class, then it should raise an error.

Array.instance # => error

Related issues 2 (0 open2 closed)

Related to Ruby master - Feature #12655: Accessing the method visibilityClosedActions
Related to Ruby master - Bug #11063: Special singleton class should return true for singleton_class? testRejectedActions
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