This README is the one indexed from the repository at its latest ref, not from the tag for this version.

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