In the case of Storable, the hook functions are responsible for returning a string that represents the data -- it's a custom serialization routine. It's not so much the order that matters, but for handling data that isn't part of a Perl data structure. That might be C data structures for an XS module, or -- for the purposes of the presentation -- an inside-out object where the reference is just an index and the real data is kept in lexical hashes that Storable doesn't know about.

For Data::Dumper, etc., it's not clear how an inside-out object should be dumped as eval-able code. Object::InsideOut addresses this by providing it's own dump/pump routines that dump and recreate an object. However, that doesn't work well if some programmer throws an ordinary data structure with inside-out objects at Data::Dumper.

use Some::InsideOut::Class;
use Data::Dumper;

my @list;

for ( 1 .. 10 ) {
  push @list, Some::InsideOut::Class->new( data => $_ );
}

print Dumper \@list;

[download]

The earlier comment about Data::Dumper::Freezer suggests that there is probably a way to convert the inside-out object to a regular Perl data structure to be dumped. A couple problems that I see:

-xdg

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In reply to Re^2: Hooks like Storable for Dumper? by xdg
in thread Hooks like Storable for Dumper? by xdg

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