Partial classes in Ruby. Generates a new, specialised class by defining some of it's initializer arguments ahead of time.

gistfile1.rb

class Class
  def partial(*prep)
    Class.new(self) do
      define_method(:initialize) do |*args|
        super(*(prep + args))
      end
    end
  end

  def << (prep)
    partial(prep)
  end
end

# e.g. 
# Logfile = File << "/tmp/test.txt"
# Logfile.new do |f| { ... }