:D perlintro#if 
my( $ref ) = @_;
my %revmod;
if( ref $ref ){
  %revmod = %$ref;
}
...

[download]

Or  my %revmod = eval { %{ $_[0] } };

In reply to Re: Dereferencing %hash that does not exist. (conditional) by Anonymous Monk
in thread Dereferencing %hash that does not exist. by perldarren

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