RE: quick question on internal data structure

[Marcos . Rebelo]

I sink the are copied in boat places

for the first teste this code

use Data::Dumper;
sub PassHash
{
    my (%new_hash) = @_;
    $new_hash{a} = 3;
}
my %hash = (a=>1, b=>2);
PassHash(%hash);
print Dumper(\%hash);

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::

for the second teste this code

use Data::Dumper;
my %hash = (a=>1, b=>2);
sub CreatHash
{
    return %hash;
}

sub OtherProc
{
    my %new_hash = CreateHash();
    $new_hash{a} = 3;
    print Dumper(\%hash);
}


Marcos

-----Original Message-----
From: Lodewijks, Jeroen [mailto:[EMAIL PROTECTED]
Sent: Tuesday, July 29, 2003 4:47 PM
To: '[EMAIL PROTECTED]'
Subject: quick question on internal data structure


Hi all,

I have a 2 questions about the internal representation of a hash or array.
Consider this piece of code:

1) 

sub PassHash
{
    my (%hash) = @_;

    $hash{$some_key} = 'test';
   ...
}
 
PassHash(%hash);

What happens internally? Will the whole contents of the hash be copied in
memory?
Or is only a reference passed? Will the $some_key element show up after
PassHash?
Does the same apply to arrays?


2) 

sub CreatHash
{
    my %hash;

    ... do something with hash;

    return %hash;
}

sub OtherProc
{
    my %new_hash = CreateHash();

    ....
}

What happens internally? Will the whole contents of the hash be copied in
memory to %new_hash?
Or is only a reference passed? When is %hash garbage collected and when is
%new_hash?
Does the same apply to arrays?

Thank you for you answers in advance. I need this information to optimise
memory requirements for my program.

Jeroen






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