Re^4: Using Constants in Perl


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Re^4: Using Constants in Perl

by the_slycer (Chaplain)

on Mar 01, 2006 at 01:15 UTC ( [id://533553]=note: print w/replies, xml )

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in reply to Re^3: Using Constants in Perl
in thread Using Constants in Perl

I was pretty sure you could declare a hash with use constant.. or well, a hash reference anyways:

use constant HASH_REF => {
   constant_key => 'constant_value',
   ...
};
[download]

Then use it like you would any hashref ie:
print HASH_REF->{constant_key}
or
foreach my $key (keys %{ &HASH_REF }) { ... }
or the even weirder:
foreach my $key (keys %{ HASH_REF() }) { ... }

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Re^5: Using Constants in Perl by jhourcle (Prior) on Mar 01, 2006 at 14:22 UTC
You can declare it, yes, but it's not read only. The reference itself remains constant, but the data that it's referring to can be changed: `use constant HASH_REF => { key => 'value' }; HASH_REF->{new_key} = 'new value'; HASH_REF->{key} = 'modified'; use Data::Dumper; print Dumper HASH_REF;` [download]	[reply] [d/l]

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