Module: Abstractize

Defined in:
lib/abstractize.rb,
lib/abstractize/version.rb

Overview

Mixin for abstract classes

Constant Summary collapse

VERSION = 
"0.1.1"

Class Method Summary collapse

Class Method Details

.abstract_method ⇒ Object 



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# File 'lib/abstractize.rb', line 23

def abstract_method
  lambda do |name|
    define_method(name) do |*_args|
      fail AbstractError, 'not implemented'
    end
  end
end

.abstract_new(base) ⇒ Object 



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# File 'lib/abstractize.rb', line 15

def abstract_new(base)
  lambda do |*args|
    instance = super(*args)
    fail AbstractError, "cannot instanciate #{name}" if self == base
    instance
  end
end

.included(base) ⇒ Object 



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# File 'lib/abstractize.rb', line 6

def self.included(base)
  (class << base; self; end).instance_eval do
    define_method(:new, Abstractize.abstract_new(base))
    define_method(:define_abstract_method, Abstractize.abstract_method)
  end
end