# Inspecting cyclic structures

#1

hello,

is there a way to inspect an object only to a given depth to avoid
infinite
loops in case of referential loops? like irb does:

irb(main):001:0> a = Object.new
=> #Object:0x2be6cd0
irb(main):002:0> b = Object.new
=> #Object:0x2be4900
irb(main):003:0> a.instance_variable_set(:@b, b)
=> #Object:0x2be4900
irb(main):004:0> b.instance_variable_set(:@a, a)
=> #<Object:0x2be6cd0 @b=#<Object:0x2be4900 @a=#<Object:0x2be6cd0 …>>>
irb(main):005:0> a.inspect
=> “#<Object:0x2be6cd0 @b=#<Object:0x2be4900 @a=#<Object:0x2be6cd0
…>>>”
irb(main):006:0>

thanks
konstantin

#2

On Tue, 14 Feb 2006, konsu wrote:

=> #Object:0x2be4900
irb(main):004:0> b.instance_variable_set(:@a, a)
=> #<Object:0x2be6cd0 @b=#<Object:0x2be4900 @a=#<Object:0x2be6cd0 …>>>
irb(main):005:0> a.inspect
=> “#<Object:0x2be6cd0 @b=#<Object:0x2be4900 @a=#<Object:0x2be6cd0 …>>>”
irb(main):006:0>

thanks
konstantin

harp:~ > cat a.rb
a = Object.new
b = Object.new
a.instance_variable_set(:@b, b)
b.instance_variable_set(:@a, a)

p a
require “yaml” and y a
require “pp” and pp a

harp:~ > ruby a.rb
#<Object:0xb75cdc64 @b=#<Object:0xb75cdc50 @a=#<Object:0xb75cdc64
…>>>
— &id001 !ruby/object
b: !ruby/object
a: *id001
#<Object:0xb75cdc64 @b=#<Object:0xb75cdc50 @a=#<Object:0xb75cdc64
…>>>

hth.

-a

#3

please disregard this, it seems to work outside irb too. in still
outputs
too much stuff in my case but it still does not loop forever.

konstantin