Method: Object#singleton_class

Defined in:

object.c

#singleton_class ⇒ Class

Returns the singleton class of obj. This method creates a new singleton class if obj does not have it.

If obj is nil, true, or false, it returns NilClass, TrueClass, or FalseClass, respectively. If obj is a Fixnum or a Symbol, it raises a TypeError.

Object.new.singleton_class  #=> #<Class:#<Object:0xb7ce1e24>>
String.singleton_class      #=> #<Class:String>
nil.singleton_class         #=> NilClass

Returns:

• (Class)

# File 'object.c'

/*
 *  call-seq:
 *     obj.singleton_class    -> class
 *
 *  Returns the singleton class of <i>obj</i>.  This method creates
 *  a new singleton class if <i>obj</i> does not have it.
 *
 *  If <i>obj</i> is <code>nil</code>, <code>true</code>, or
 *  <code>false</code>, it returns NilClass, TrueClass, or FalseClass,
 *  respectively.
 *  If <i>obj</i> is a Fixnum or a Symbol, it raises a TypeError.
 *
 *     Object.new.singleton_class  #=> #<Class:#<Object:0xb7ce1e24>>
 *     String.singleton_class      #=> #<Class:String>
 *     nil.singleton_class         #=> NilClass
 */

static VALUE
rb_obj_singleton_class(VALUE obj)
{
    return rb_singleton_class(obj);
}