Self referencing hash

[Dermot]

Hi,

I am trying to make hash that refers to itself like this

my %_HASH;
%_HASH = (
   typeOne => {
         root => '/path/to/typeOne',
         logfile => $_HASH{typeOne}->{root}.'/logone.log';
  },
   typeTwo => {
        root => '/path/to/typeTwo',
        logfile => $_HASH{typeTwo}->{root}.'/logtwo.log';
  }
);


But nothing is initialised at this point so $_HASH{typeOne}->{root} is
an uninitialized value when creating and logfile key.

Is there a way around this?
TiA,
Dp.

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