Abstractize

A simple mixin for abstract class functionality in ruby

Add this line to your application's Gemfile:

gem 'abstractize'

And then execute:

$ bundle

Or install it yourself as:

$ gem install abstract

require 'abstractize'

class Vehicle
  include Abstractize

  attr_reader :wheels, :mileage
  def initialize(wheels=4)
    @mileage = 0
    @wheels = wheels
  end

  define_abstract_method :drive
end

class Car < Vehicle
end

class Tricycle < Vehicle
  def initialize
    super(3)
  end

  def drive
    @mileage += 0.01
  end
end

vehicle = Vehicle.new(2)
# AbstractError: cannot instanciate Vehicle
car = Car.new
# => #<Car:0x007f5e130631f0 @mileage=0, @wheels=4>
car.drive
# AbstractError: not implemented
tricycle = Tricycle.new
# => #<Tricycle:0x007f5e13093148 @mileage=0, @wheels=3>
tricycle.drive
# => 0.01
tricycle.drive
# => 0.02

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

1. Fork it ( https://github.com/[my-github-username]/abstract/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request