in reply to Re^4: Getting Getopt::Long values into a hash
in thread Getting Getopt::Long values into a hash

As far as I know this should create a hash reference

Yes that is correct.

What exactly means 'dereference to the LHS value'?

LHS = left hand side. I meant that the arrow operator takes a reference on the left, and dereferences it (ie. 'replaces' it with what it points to). You can then subscript it in various ways, with a key (for a hashref), an index (arrayref), parameters (coderef), or a method (object).

A hashref is not a hash, and thus you cannot access it directly. You need to first "fetch" the hash that it points to.

  • Comment on Re^5: Getting Getopt::Long values into a hash

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Re^6: Getting Getopt::Long values into a hash
by jeanluca (Deacon) on Nov 08, 2005 at 16:51 UTC
    Thanks a lot, I just wrote a short test program: 
    #! /usr/bin/perl

my %mh ;

$mh{a} = "b" ;
$mh->{b} = "c" ;

print "values are hash=$mh{a}, hash=$mh{b} or hashref=$mh->{b} \n" ;

    [download]
    The problem with perl I think is that different types can have the same name.
    I wrote a script once, and before I knew it I was mixing hashes and hash references!

    Luca
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