1 |
## ------------------------------------------------------------------------- |
2 |
## $Id: Exception.pm,v 1.2 2003/02/20 20:53:55 joko Exp $ |
3 |
## ------------------------------------------------------------------------- |
4 |
## $Log: Exception.pm,v $ |
5 |
## ------------------------------------------------------------------------- |
6 |
|
7 |
|
8 |
package Tie::SummableHash; |
9 |
|
10 |
use strict; |
11 |
use warnings; |
12 |
|
13 |
use base qw( Hash::Serializer ); |
14 |
|
15 |
use overload |
16 |
'+=' => \&sum_hash, |
17 |
; |
18 |
|
19 |
use Tie::IxHash; |
20 |
use Data::Dumper; |
21 |
|
22 |
|
23 |
sub new { |
24 |
#print "new: ", __PACKAGE__, "\n"; |
25 |
my $class = shift; |
26 |
my $value = shift; |
27 |
tie(%{$value}, "Tie::IxHash"); |
28 |
return bless \$value => $class; |
29 |
} |
30 |
|
31 |
|
32 |
sub sum_hash { |
33 |
|
34 |
#print Dumper(@_); |
35 |
my ($x, $y) = @_; |
36 |
#print "x: "; |
37 |
#print Dumper($x); |
38 |
#print "y: "; |
39 |
#print Dumper($y); |
40 |
my $value = $$x; |
41 |
|
42 |
#$value->{sumCount}++; |
43 |
foreach my $key (keys %{$y}) { |
44 |
# initialize key if undefined yet to prevent "Use of uninitialized value in addition (+) at [...]" |
45 |
$value->{$key} ||= 0; |
46 |
# sum up statistic-counts |
47 |
$value->{$key} += $y->{$key}; |
48 |
} |
49 |
|
50 |
return bless \$value => ref($x); |
51 |
} |
52 |
|
53 |
1; |
54 |
__END__ |