Re: array of hash

[choroba]

I read your post several times, but I still don't get it. What output do you expect?

Update: Now I see it! You don't use strict (refs).

print Dumper $curr{my}[2], $curr{my}[2]{AB}, \%CD;

outputs

$VAR1 = 'CD';
$VAR2 = 1;
$VAR3 = {
          'AB' => 1
        };

See Can you use string as a HASH ref while "strict refs" in use? for an explanation.

[carolw]

perhaps I didn't fully understand your comment but i changed my program based on use strict. I still have problem

If I don't use the hash ref, I get this error Can't use string ("CD") as a HASH ref while "strict refs" in use at ./test.pl line 15.

and if i use hash ref, I don't get any value for the key CD Don't know why?! curr CD AB 1 currhash CD AB 1

The desired output is curr CD 0 AB 1 currhash CD 0 AB 0

#!/usr/bin/perl
 use strict;

sub parseFiles{
   my @currArr=();
my %curr;
my %tmp = $_[0];

    push @currArr,'+1';
    push @currArr,'u';
    push @currArr,%tmp; # push @currArr,%currHash; in the first case

    $curr{"my"}=[@currArr];

    $curr{"my"}->[2]{"AB"}++;

    #print scalar(keys %{$curr{"my"}->[2]}), "\n";

    #print  $curr{"my"}->[0], " ", $curr{"my"}->[1], "\n";

print "curr\n";

    foreach (keys %{$curr{"my"}->[2]}){
            print  $_, " ", $curr{"my"}->[2]{$_}, " ";
    }
    print "\n";

print "currhash\n";

    foreach (keys %tmp){
            print $_, " ", $tmp{$_}, " ";
    }
    print "\n";
}
 
sub storeHash{
my %currHash;

        $currHash{"AB"}=$currHash{"CD"}= 0;
    return %currHash;
}

sub main{
my %currHash;
    %currHash=storeHash();
    parseFiles(%currHash);
}

main();

[choroba]

Can't use string ("CD") as a HASH ref while "strict refs" in use

Yes, that's the point you perhaps didn't fully understand. $cur{my}[2] is "CD", you can't dereference it as a hash under strict. Without strict, it's understood as symbol reference and the hash %CD is used, as I demonstrated in my original reply.

[carolw]

if I add your line to my program, I get the following error

print Dumper $curr{my}[2], $curr{my}[2]{AB}, \%CD;

Global symbol "%CD" requires explicit package name at ./test.pl line 14.

In addition, how do you print the elements of $curr when using use strict?

   foreach (keys %{$curr{"my"}->[2]}){
            print  $_, " ", $curr{"my"}->[2]{$_}, " ";
    }
    print "\n";

[carolw]

it's seems that I can access $curr{"my"}->2{"AB"} correctly but not for CD as the key when using strict. Why?

Do you have the solution how to build and access the array of hash correclty? I get more and more confused

[carolw]

I don't want to build. I already build %currHash and then, want to assign the whole %currHash to the 3rd array element of %curr. Then, I will change the value of the keys of the hash which is the 3rd element of array of %curr but I don't want that %currHash gets changed

If I do such assignment, how come that the value of the CD doesn't exist when assigning %currHash or %tmp?

[carolw]

Also how to access the value of CD using strict?

[carolw]

I have no idea. push @currArr,%currHash doesn't seem to be correct and can't think of any thing else. I just want to build an array of hash; that is, the 3rd el of @currArr is %currHash

[carolw]

Cont.

by the way, despite use strict, the value of %currHash is modified. So the problem is still there.