Aliasing class methods

[xmitchx]

Is there any way to alias a class method? I am familiar with alias_method but I'm not sure if that works with class methods. But if there is none available im sure it wouldn't be too hard to write my own.

But it'd be nice if Ruby has it already out there

[xmitchx]

Until someone replies with one, I have taken it upon myself to write my own. Tested basically and it works:

class Object
  def self.alias_class_method(new, old)
	new = new.to_s if new.is_a?(Symbol)
	old = old.to_s if old.is_a?(Symbol)
	raise ArgumentError.new('new and old must be a symbol or a string of the method name') unless new.is_a?(String) and old.is_a?(String)
	class_eval <<-EVALEND
	  def self.#{new}(*args)
		self.#{old}(*args)
	  end
	EVALEND
  end
end

Usage:

class Classtest
   def self.callme(param, oh = nil)
 	puts param
 	puts oh unless oh.nil?
   end
   
   alias_class_method :bla, :callme
 end
 
 Classtest.callme('rawr')
 Classtest.bla('rawr')
 Classtest.bla('rawr', 'hehe')

[Fenrir2]

I think this works:

class Test
   #normal scope
  class <<self
    #scope of class
     def bar
       puts "bar"
     end

     alias_method :foo, :bar
  end
end

[DougBTX]

I think this works:

If the class Test already exists, this works too:

>> class <<Test
?>    def bar
>>      puts "bar"
>>    end
>>
?>    alias_method :foo, :bar
>> end
=> #<Class:Test>
>> Test.bar
bar
=> nil
>> Test.foo
bar
=> nil

I am familiar with alias_method but I'm not sure if that works with class methods.

The important thing to remember is that the class is an object just like any other (You can even have "class methods" for a Class )

>> class Alpha
>> end
=> nil
>> Alpha.class
=> Class

>> Alpha.methods.sort
=> ["<", "<=", "<=>", "==", "===", "=~", ">", ">=", "__id__", "__send__", "alloc
ate", "ancestors", "autoload", "autoload?", "class", "class_eval", "class_variab
les", "clone", "const_defined?", "const_get", "const_missing", "const_set", "con
stants", "display", "dup", "eql?", "equal?", "extend", "freeze", "frozen?", "has
h", "id", "include?", "included_modules", "inspect", "instance_eval", "instance_
method", "instance_methods", "instance_of?", "instance_variable_get", "instance_
variable_set", "instance_variables", "is_a?", "kind_of?", "method", "method_defi
ned?", "methods", "module_eval", "name", "new", "nil?", "object_id", "private_cl
***_method", "private_instance_methods", "private_method_defined?", "private_met
hods", "protected_instance_methods", "protected_method_defined?", "protected_met
hods", "public_class_method", "public_instance_methods", "public_method_defined?
", "public_methods", "require", "require_gem", "require_gem_with_options", "resp
ond_to?", "send", "singleton_methods", "superclass", "taint", "tainted?", "to_a"
, "to_s", "type", "untaint"]

Douglas

[xmitchx]

Thanks! Oh of course class <<self would work! Doh! Thank you very much though for pointing that out