in reply to How to change referent of lexical reference?

I would be inclined to just define my own comparison method that made it obvious that I was doing a deep comparison that the two hashes had the same contents.

If you insist on being able to use == for this, you could try turning $foo into an overloaded object whose == method checked that both sides freeze into the same string (with $Storable::Canonical set to a true value of course, and modulo what you need to do for the overload to operate).

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Re: Re: How to change referent of lexical reference?
by autarch (Hermit) on Sep 22, 2003 at 03:27 UTC
    See above. This isn't a question of comparison, but rather that I really don't want two objects that have the same data.
[reply]
      The general part of the question (how to recognize other data structures that mirror data) is hard.

      But causing one reference to a data structure to be the same as another is fairly easy: 

      sub some_sub {
  $_[0] = $bar;
}

      [download]
      The trick is that while variables are in @_ they are passed in by reference. If you don't make copies, then you can modify the passed in values. This API may surprise...
[reply]
[d/l]
        As I mentioned in response to someone else, it doesn't work in this particular case, because of the way Storable calls the STORABLE_thaw() method.
[reply]

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