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?? abbrev.rb(3.46 KB)
?? base64.rb(2.63 KB)
?? benchmark.rb(17.73 KB)
?? cgi
?? cgi.rb(9.77 KB)
?? cmath.rb(9.34 KB)
?? csv.rb(82.45 KB)
?? date.rb(980 B)
?? debug.rb(29.08 KB)
?? delegate.rb(10.71 KB)
?? digest
?? digest.rb(2.79 KB)
?? drb
?? drb.rb(19 B)
?? e2mmap.rb(3.77 KB)
?? erb.rb(26.35 KB)
?? expect.rb(2.14 KB)
?? fiddle
?? fiddle.rb(1.65 KB)
?? fileutils.rb(47.46 KB)
?? find.rb(2.48 KB)
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?? getoptlong.rb(15.38 KB)
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?? irb.rb(20.03 KB)
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?? kconv.rb(5.74 KB)
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?? matrix.rb(53.14 KB)
?? mkmf.rb(82.59 KB)
?? monitor.rb(6.93 KB)
?? mutex_m.rb(2 KB)
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?? open-uri.rb(24.58 KB)
?? open3.rb(20.55 KB)
?? openssl
?? openssl.rb(528 B)
?? optionparser.rb(28 B)
?? optparse
?? optparse.rb(52.05 KB)
?? ostruct.rb(8.66 KB)
?? pathname.rb(15.58 KB)
?? pp.rb(14.16 KB)
?? prettyprint.rb(15.85 KB)
?? prime.rb(13.11 KB)
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?? psych.rb(14.88 KB)
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?? rake.rb(2.23 KB)
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?? rdoc.rb(4.96 KB)
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?? resolv.rb(72.06 KB)
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?? ripper.rb(2.53 KB)
?? rss
?? rss.rb(2.84 KB)
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?? rubygems.rb(31.85 KB)
?? scanf.rb(23.54 KB)
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?? shell.rb(11.3 KB)
?? shellwords.rb(5.96 KB)
?? singleton.rb(4.02 KB)
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?? sync.rb(7.25 KB)
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?? thwait.rb(3.31 KB)
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?? timeout.rb(3.64 KB)
?? tmpdir.rb(4.13 KB)
?? tracer.rb(6.4 KB)
?? tsort.rb(14.27 KB)
?? ubygems.rb(268 B)
?? un.rb(8.87 KB)
?? unicode_normalize
?? unicode_normalize.rb(3.16 KB)
?? uri
?? uri.rb(3.07 KB)
?? weakref.rb(2.92 KB)
?? webrick
?? webrick.rb(6.69 KB)
?? x86_64-linux
?? xmlrpc
?? xmlrpc.rb(8.49 KB)
?? yaml
?? yaml.rb(1.7 KB)

Editing: weakref.rb

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)
#
# == Example
#
# With help from WeakRef, we can implement our own rudimentary WeakHash class.
#
# We will call it WeakHash, since it's really just a Hash except all of it's
# keys and values can be garbage collected.
#
#     require 'weakref'
#
#     class WeakHash < Hash
#       def []= key, obj
#         super WeakRef.new(key), WeakRef.new(obj)
#       end
#     end
#
# This is just a simple implementation, we've opened the Hash class and changed
# Hash#store to create a new WeakRef object with +key+ and +obj+ parameters
# before passing them as our key-value pair to the hash.
#
# With this you will have to limit your self to String keys, otherwise you
# will get an ArgumentError because WeakRef cannot create a finalizer for a
# Symbol. Symbols are immutable and cannot be garbage collected.
#
# Let's see it in action:
#
#   omg = "lol"
#   c = WeakHash.new
#   c['foo'] = "bar"
#   c['baz'] = Object.new
#   c['qux'] = omg
#   puts c.inspect
#   #=> {"foo"=>"bar", "baz"=>#<Object:0x007f4ddfc6cb48>, "qux"=>"lol"}
#
#   # Now run the garbage collector
#   GC.start
#   c['foo'] #=> nil
#   c['baz'] #=> nil
#   c['qux'] #=> nil
#   omg      #=> "lol"
#
#   puts c.inspect
#   #=> WeakRef::RefError: Invalid Reference - probably recycled
#
# You can see the local variable +omg+ stayed, although its reference in our
# hash object was garbage collected, along with the rest of the keys and
# values. Also, when we tried to inspect our hash, we got a WeakRef::RefError.
# This is because these objects were also garbage collected.

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,
  # Fixnum, 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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