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Weak references for Ruby


Add to your Gemfile and bundle

gem "wref"


Make a new weak reference

str = "Test"
weak_ref =

Check if reference is still alive

weak_ref.alive? #=> true | false

Spawn a weak map

weak_map =

Set a key and value in a weak map

str = "Test"
map[1] = str
map.set(1, str)

Get values from a weak map

map.get(1) #=> "Test" | nil
map.get!(1) #=> "Test" | Wref::Recycled error

Loop over all valid pairs in a weak map

map.each do |key, value|
  puts "Valid pair: #{key}: #{value}"

Check if key is valid in a weak map.

map.valid?(1) #=> true | false

Getting length of both valid and invalid and the current time in a weak map (fastest)

map.length #=> 1

Getting length of valid options in a weak map

map.length_valid #=> 0

Get from a key

map.get(1) #=> "Test" | nil
map.get!(1) #=> "Test" | Error - Wref::Recycled

Delete a key from a weak map

map.delete(1) #=> "Test" | nil if recycled

Delete all recycled options


Contributing to wref

  • Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet.
  • Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it.
  • Fork the project.
  • Start a feature/bugfix branch.
  • Commit and push until you are happy with your contribution.
  • Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
  • Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Copyright (c) 2012 Kasper Johansen. See LICENSE.txt for further details.