# frozen_string_literal: true

[0] Fix | Delete

require "delegate"

[1] Fix | Delete

[2] Fix | Delete

# Weak Reference class that allows a referenced object to be

[3] Fix | Delete

# garbage-collected.

[4] Fix | Delete

#

[5] Fix | Delete

# A WeakRef may be used exactly like the object it references.

[6] Fix | Delete

#

[7] Fix | Delete

# Usage:

[8] Fix | Delete

#

[9] Fix | Delete

# foo = Object.new # create a new object instance

[10] Fix | Delete

# p foo.to_s # original's class

[11] Fix | Delete

# foo = WeakRef.new(foo) # reassign foo with WeakRef instance

[12] Fix | Delete

# p foo.to_s # should be same class

[13] Fix | Delete

# GC.start # start the garbage collector

[14] Fix | Delete

# p foo.to_s # should raise exception (recycled)

[15] Fix | Delete

#

[16] Fix | Delete

[17] Fix | Delete

class WeakRef < Delegator

[18] Fix | Delete

VERSION = "0.1.2"

[19] Fix | Delete

[20] Fix | Delete

##

[21] Fix | Delete

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

[22] Fix | Delete

# garbage collector

[23] Fix | Delete

[24] Fix | Delete

class RefError < StandardError

[25] Fix | Delete

end

[26] Fix | Delete

[27] Fix | Delete

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

[28] Fix | Delete

[29] Fix | Delete

##

[30] Fix | Delete

# Creates a weak reference to +orig+

[31] Fix | Delete

[32] Fix | Delete

def initialize(orig)

[33] Fix | Delete

case orig

[34] Fix | Delete

when true, false, nil

[35] Fix | Delete

@delegate_sd_obj = orig

[36] Fix | Delete

else

[37] Fix | Delete

@@__map[self] = orig

[38] Fix | Delete

end

[39] Fix | Delete

super

[40] Fix | Delete

end

[41] Fix | Delete

[42] Fix | Delete

def __getobj__ # :nodoc:

[43] Fix | Delete

@@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj :

[44] Fix | Delete

Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2))

[45] Fix | Delete

end

[46] Fix | Delete

[47] Fix | Delete

def __setobj__(obj) # :nodoc:

[48] Fix | Delete

end

[49] Fix | Delete

[50] Fix | Delete

##

[51] Fix | Delete

# Returns true if the referenced object is still alive.

[52] Fix | Delete

[53] Fix | Delete

def weakref_alive?

[54] Fix | Delete

@@__map.key?(self) or defined?(@delegate_sd_obj)

[55] Fix | Delete

end

[56] Fix | Delete

end

[57] Fix | Delete

[58] Fix | Delete