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bjeanes/gist:90427

Created April 5, 2009 11:33
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gistfile1.rb
>> (1..10).map(&:object_id)
=> [3, 5, 7, 9, 11, 13, 15, 17, 19, 21]
>> (-10..-1).map(&:object_id)
=> [-19, -17, -15, -13, -11, -9, -7, -5, -3, -1]
>> ObjectSpace._id2ref(-1)
=> -1
>> ObjectSpace._id2ref(-5)
=> -3
>> ObjectSpace._id2ref(-2) # if -2 = 0xfffffffe, then -1 == 0xffffffff
RangeError: 0xfffffffe is not id value
from (irb):66:in '_id2ref'
from (irb):66
>> 0xffffffff
=> 4294967295 # maximum number of objects in Ruby?
>> ObjectSpace._id2ref(4294967295)
=> -1
>> ObjectSpace._id2ref(-1)
=> -1
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