delegate

Ruby's delegate feature, implemented as Crystal macros.

Installation

Add this to your application's shard.yml:

dependencies:
  delegate:
    github: anicholson/delegate

Usage

require "delegate"

class Engine
  def state
    :stopped
  end
end

class Car
  include Delegate

  def initialize(@engine)
  end

  private getter engine

  delegate to: engine, methods: [state]
end

car = Car.new(Engine.new)

car.state # => :stopped

delegating to non-implemented methods results in a compile-time error:

require "delegate"

# ... Engine definition as before

class Motorbike
  def initialize(@engine)
  end

  private getter engine

  delegate to: engine, methods: [state, current_gear]
end

bike = Motorbike.new(Engine.new)
bike.current_gear # :boom: compile error: Engine does not implement :current_gear

Development

1. Check out the code via git clone
2. Run shards install
3. Run crystal spec to run all tests.

Contributing

1. Fork it (https://github.com/your-github-user/delegate/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

Contributors

• anicholson Andy Nicholson - creator, maintainer