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?? English.rb(6.31 KB)
?? abbrev.rb(3.49 KB)
?? base64.rb(3.3 KB)
?? benchmark.rb(17.89 KB)
?? cgi
?? cgi.rb(9.8 KB)
?? cmath.rb(9.49 KB)
?? csv.rb(82.88 KB)
?? date.rb(1003 B)
?? debug.rb(29.97 KB)
?? delegate.rb(10.44 KB)
?? digest
?? digest.rb(2.83 KB)
?? drb
?? drb.rb(50 B)
?? e2mmap.rb(3.94 KB)
?? erb.rb(27.46 KB)
?? expect.rb(2.17 KB)
?? fiddle
?? fiddle.rb(1.68 KB)
?? fileutils.rb(44.15 KB)
?? find.rb(2.47 KB)
?? forwardable
?? forwardable.rb(8.49 KB)
?? getoptlong.rb(15.42 KB)
?? io
?? ipaddr.rb(19.51 KB)
?? irb
?? irb.rb(20.48 KB)
?? json
?? json.rb(1.77 KB)
?? kconv.rb(5.77 KB)
?? logger.rb(23.54 KB)
?? matrix
?? matrix.rb(53.2 KB)
?? mkmf.rb(84.4 KB)
?? monitor.rb(7.71 KB)
?? mutex_m.rb(2.02 KB)
?? net
?? observer.rb(5.83 KB)
?? open-uri.rb(25.11 KB)
?? open3.rb(20.94 KB)
?? openssl
?? openssl.rb(469 B)
?? optionparser.rb(59 B)
?? optparse
?? optparse.rb(57.25 KB)
?? ostruct.rb(10.16 KB)
?? pathname.rb(16.09 KB)
?? pp.rb(14.36 KB)
?? prettyprint.rb(15.89 KB)
?? prime.rb(12.48 KB)
?? profile.rb(235 B)
?? profiler.rb(4.54 KB)
?? pstore.rb(14.7 KB)
?? psych
?? psych.rb(16.54 KB)
?? racc
?? rdoc
?? rdoc.rb(5.04 KB)
?? resolv-replace.rb(1.76 KB)
?? resolv.rb(73.66 KB)
?? rexml
?? rinda
?? ripper
?? ripper.rb(2.44 KB)
?? rss
?? rss.rb(2.87 KB)
?? rubygems
?? rubygems.rb(36.4 KB)
?? scanf.rb(23.57 KB)
?? securerandom.rb(8.67 KB)
?? set.rb(24.01 KB)
?? shell
?? shell.rb(11.37 KB)
?? shellwords.rb(6.66 KB)
?? singleton.rb(4.04 KB)
?? socket.rb(43.51 KB)
?? sync.rb(7.29 KB)
?? syslog
?? tempfile.rb(11.14 KB)
?? thwait.rb(3.33 KB)
?? time.rb(22.38 KB)
?? timeout.rb(3.81 KB)
?? tmpdir.rb(4.25 KB)
?? tracer.rb(6.42 KB)
?? tsort.rb(14.3 KB)
?? un.rb(9.78 KB)
?? unicode_normalize
?? uri
?? uri.rb(3.1 KB)
?? weakref.rb(1.44 KB)
?? webrick
?? webrick.rb(6.72 KB)
?? x86_64-linux
?? yaml
?? yaml.rb(1.73 KB)

Editing: weakref.rb

# frozen_string_literal: true
require "delegate"

# Weak Reference class that allows a referenced object to be
# garbage-collected.
#
# A WeakRef may be used exactly like the object it references.
#
# Usage:
#
#   foo = Object.new            # create a new object instance
#   p foo.to_s                  # original's class
#   foo = WeakRef.new(foo)      # reassign foo with WeakRef instance
#   p foo.to_s                  # should be same class
#   GC.start                    # start the garbage collector
#   p foo.to_s                  # should raise exception (recycled)
#

class WeakRef < Delegator

##
  # RefError is raised when a referenced object has been recycled by the
  # garbage collector

class RefError < StandardError
  end

@@__map = ::ObjectSpace::WeakMap.new

##
  # Creates a weak reference to +orig+
  #
  # Raises an ArgumentError if the given +orig+ is immutable, such as Symbol,
  # Integer, or Float.

def initialize(orig)
    case orig
    when true, false, nil
      @delegate_sd_obj = orig
    else
      @@__map[self] = orig
    end
    super
  end

def __getobj__ # :nodoc:
    @@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj :
      Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2))
  end

def __setobj__(obj) # :nodoc:
  end

##
  # Returns true if the referenced object is still alive.

def weakref_alive?
    @@__map.key?(self) or defined?(@delegate_sd_obj)
  end
end

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Editing: weakref.rb

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