How to create an object in Ruby without using new

Question

It's possible to create a Complex number in Ruby using

c = Complex.new(1,2)

but, it can be shortened to

c = Complex(1,2)

Is it possible to achieve the same functionality without having to define a function outside the class, like in the example below?

class Bits
  def initialize(bits)
    @bits = bits
  end
end

def Bits(list) # I would like to define this function inside the class
  Bits.new list
end

b = Bits([0,1])

I think Ruby should allow at least one of the proposed constructors below

class Bits
  def initialize(bits)
    @bits = bits
  end

  def self.Bits(list) # version 1
    new list
  end

  def Bits(list)      # version 2
    new list
  end

  def Bits.Bits(list) # version 3
    new list
  end
end

Answer 1

Have this snippet:

def make_light_constructor(klass)
    eval("def #{klass}(*args) #{klass}.new(*args) end")
end

Now you can do this:

class Test
    make_light_constructor(Test)
    def initialize(x,y)
        print x + y
    end 
end

t = Test(5,3)

Yes, I know you're still defining a function outside a class - but it is only one function, and now any class you want can make use of its implementation rather than making one function per class.