singleton

Singleton library for Crystal. Created out of necessity to work around the problem with class variables inside of generic classes.

Installation

Add this to your application's shard.yml:

dependencies:
  singleton:
    github: waterlink/singleton.cr

Usage

require "singleton"

Fetching instance of certain type

Singleton.instance_of(Example)

This uses Example.new to produce the instance.

Making singleton out of Example(T) class now would look like that:

class Example(T)
  def self.instance
    Singleton.instance_of(self)
  end
end

Resetting all singletons (in tests)

Singleton.reset

Contributing

1. Fork it ( https://github.com/waterlink/singleton.cr/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

• waterlink Oleksii Fedorov - creator, maintainer