Module#singleton_class?

() -> bool

mod.singleton_class? → true or false

static VALUE
rb_mod_singleton_p(VALUE klass)
{
    return RBOOL(RCLASS_SINGLETON_P(klass));
}

Returns true if mod is a singleton class or false if it is an ordinary class or module.

Example

class C
end
C.singleton_class?                  #=> false
C.singleton_class.singleton_class?  #=> true

See also #set_temporary_name #to_s #ruby2_keywords #undefined_instance_methods also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0