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# 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
  VERSION = "0.1.3"

##
  # 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+

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

[+] yaml
[+] strscan
[-] ostruct.rb [edit]
[+] ruby_vm
[+] ripper
[-] coverage.rb [edit]
[+] set
[-] delegate.rb [edit]
[-] open-uri.rb [edit]
[+] did_you_mean
[-] json.rb [edit]
[-] openssl.rb [edit]
[+] json
[+] prism
[-] objspace.rb [edit]
[-] digest.rb [edit]
[-] yaml.rb [edit]
[-] bundled_gems.rb [edit]
[+] random
[-] forwardable.rb [edit]
[+] objspace
[-] weakref.rb [edit]
[-] error_highlight.rb [edit]
[-] benchmark.rb [edit]
[-] uri.rb [edit]
[-] English.rb [edit]
[-] timeout.rb [edit]
[+] bigdecimal
[-] resolv.rb [edit]
[+] uri
[-] tsort.rb [edit]
[-] find.rb [edit]
[-] logger.rb [edit]
[-] psych.rb [edit]
[+] psych
[+] logger
[-] optparse.rb [edit]
[+] erb
[-] pp.rb [edit]
[-] date.rb [edit]
[-] ripper.rb [edit]
[-] fiddle.rb [edit]
[+] io
[+] unicode_normalize
[-] cgi.rb [edit]
[-] pathname.rb [edit]
[-] did_you_mean.rb [edit]
[+] vendor_ruby
[+] forwardable
[+] ..
[-] prettyprint.rb [edit]
[-] reline.rb [edit]
[+] reline
[-] securerandom.rb [edit]
[+] fiddle
[+] error_highlight
[+] digest
[-] optionparser.rb [edit]
[+] open3
[-] shellwords.rb [edit]
[-] time.rb [edit]
[+] openssl
[+] syntax_suggest
[-] fileutils.rb [edit]
[-] socket.rb [edit]
[+] net
[-] monitor.rb [edit]
[-] tempfile.rb [edit]
[-] syntax_suggest.rb [edit]
[-] un.rb [edit]
[-] mkmf.rb [edit]
[-] erb.rb [edit]
[-] prism.rb [edit]
[-] expect.rb [edit]
[-] open3.rb [edit]
[-] readline.rb [edit]
[+] cgi
[-] tmpdir.rb [edit]
[-] ipaddr.rb [edit]
[-] pstore.rb [edit]
[-] singleton.rb [edit]
[-] set.rb [edit]
[+] optparse