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Re: Passing a hash into a subroutine

by hmerrill (Friar)
on Jan 08, 2004 at 13:46 UTC ( #319801=note: print w/ replies, xml ) Need Help??

in reply to Passing a hash into a subroutine

Others have pointed this out already, but I'll try to explain a little more. The safest way to pass hashes is to pass-by-reference, or pass a reference to the hash instead of passing the hash itself.

You could do this:

use Converter; my $document = new Converter; my %convert_args_hash = ( 'MIME-Type' => 'application/ms-word', 'Input' => '[In file]', 'Output' => '[Out file]' ); my $convert_args_hashref = \%convert_args_hash; my $status = $document->convert($convert_args_hashref);
Or you could do as someone already suggested and use the anonymous hash constructor curly braces (which creates a reference to an anonymous hash), like this:
my $status = $document->convert( { 'MIME-Type' => 'application/ms-word', 'Input' => '[In file]', 'Output' => '[Out file]' } );
and then in the "convert" method (subroutine) you would just accept the hashref as the one and only argument, something like this:
sub convert { my $args_hashref = shift; print "The MIME-Type parameter = $args_hashref->{'MIME-Type'}\n" +; ### blah blah ### } # end sub convert
Hopefully you get the idea.

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