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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
B
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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 : 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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