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English.rb
6.42
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abbrev.rb
3.46
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base64.rb
2.63
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benchmark.rb
17.73
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cgi.rb
9.77
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cmath.rb
9.34
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csv.rb
82.45
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date.rb
980
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debug.rb
29.08
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delegate.rb
10.71
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digest.rb
2.79
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drb.rb
19
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e2mmap.rb
3.77
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erb.rb
26.35
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expect.rb
2.14
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fiddle.rb
1.65
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fileutils.rb
47.46
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find.rb
2.48
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forwardable.rb
8.22
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getoptlong.rb
15.38
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ipaddr.rb
17.06
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irb.rb
20.03
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json.rb
1.74
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kconv.rb
5.74
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logger.rb
20.33
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mathn.rb
3.84
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matrix.rb
53.14
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mkmf.rb
82.59
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monitor.rb
6.93
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mutex_m.rb
2
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observer.rb
5.8
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open-uri.rb
24.58
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open3.rb
20.55
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openssl.rb
528
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optionparser.rb
28
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optparse.rb
52.05
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ostruct.rb
8.66
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pathname.rb
15.58
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pp.rb
14.16
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prettyprint.rb
15.85
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prime.rb
13.11
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profile.rb
205
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profiler.rb
4.51
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pstore.rb
14.55
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psych.rb
14.88
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rake.rb
2.23
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rdoc.rb
4.96
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resolv-replace.rb
1.73
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resolv.rb
72.06
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ripper.rb
2.53
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rss.rb
2.84
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rubygems.rb
31.85
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scanf.rb
23.54
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securerandom.rb
9.2
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set.rb
19.15
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shell.rb
11.3
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shellwords.rb
5.96
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singleton.rb
4.02
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socket.rb
25.6
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sync.rb
7.25
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tempfile.rb
11.11
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thwait.rb
3.31
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time.rb
22.25
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timeout.rb
3.64
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tmpdir.rb
4.13
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tracer.rb
6.4
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tsort.rb
14.27
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ubygems.rb
268
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un.rb
8.87
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unicode_normalize.rb
3.16
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uri.rb
3.07
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weakref.rb
2.92
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webrick.rb
6.69
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xmlrpc.rb
8.49
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yaml.rb
1.7
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Code Editor : singleton.rb
require 'thread' # The Singleton module implements the Singleton pattern. # # == Usage # # To use Singleton, include the module in your class. # # class Klass # include Singleton # # ... # end # # This ensures that only one instance of Klass can be created. # # a,b = Klass.instance, Klass.instance # # a == b # # => true # # Klass.new # # => NoMethodError - new is private ... # # The instance is created at upon the first call of Klass.instance(). # # class OtherKlass # include Singleton # # ... # end # # ObjectSpace.each_object(OtherKlass){} # # => 0 # # OtherKlass.instance # ObjectSpace.each_object(OtherKlass){} # # => 1 # # # This behavior is preserved under inheritance and cloning. # # == Implementation # # This above is achieved by: # # * Making Klass.new and Klass.allocate private. # # * Overriding Klass.inherited(sub_klass) and Klass.clone() to ensure that the # Singleton properties are kept when inherited and cloned. # # * Providing the Klass.instance() method that returns the same object each # time it is called. # # * Overriding Klass._load(str) to call Klass.instance(). # # * Overriding Klass#clone and Klass#dup to raise TypeErrors to prevent # cloning or duping. # # == Singleton and Marshal # # By default Singleton's #_dump(depth) returns the empty string. Marshalling by # default will strip state information, e.g. instance variables and taint # state, from the instance. Classes using Singleton can provide custom # _load(str) and _dump(depth) methods to retain some of the previous state of # the instance. # # require 'singleton' # # class Example # include Singleton # attr_accessor :keep, :strip # def _dump(depth) # # this strips the @strip information from the instance # Marshal.dump(@keep, depth) # end # # def self._load(str) # instance.keep = Marshal.load(str) # instance # end # end # # a = Example.instance # a.keep = "keep this" # a.strip = "get rid of this" # a.taint # # stored_state = Marshal.dump(a) # # a.keep = nil # a.strip = nil # b = Marshal.load(stored_state) # p a == b # => true # p a.keep # => "keep this" # p a.strip # => nil # module Singleton # Raises a TypeError to prevent cloning. def clone raise TypeError, "can't clone instance of singleton #{self.class}" end # Raises a TypeError to prevent duping. def dup raise TypeError, "can't dup instance of singleton #{self.class}" end # By default, do not retain any state when marshalling. def _dump(depth = -1) '' end module SingletonClassMethods # :nodoc: def clone # :nodoc: Singleton.__init__(super) end # By default calls instance(). Override to retain singleton state. def _load(str) instance end private def inherited(sub_klass) super Singleton.__init__(sub_klass) end end class << Singleton # :nodoc: def __init__(klass) # :nodoc: klass.instance_eval { @singleton__instance__ = nil @singleton__mutex__ = Mutex.new } def klass.instance # :nodoc: return @singleton__instance__ if @singleton__instance__ @singleton__mutex__.synchronize { return @singleton__instance__ if @singleton__instance__ @singleton__instance__ = new() } @singleton__instance__ end klass end private # extending an object with Singleton is a bad idea undef_method :extend_object def append_features(mod) # help out people counting on transitive mixins unless mod.instance_of?(Class) raise TypeError, "Inclusion of the OO-Singleton module in module #{mod}" end super end def included(klass) super klass.private_class_method :new, :allocate klass.extend SingletonClassMethods Singleton.__init__(klass) end end ## # :singleton-method: _load # By default calls instance(). Override to retain singleton state. end
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