Whoa, 1 and undef are on par , optimization?
#!/usr/bin/perl --
use Devel::Size qw(size total_size);
use strict;
use warnings;
{
my %h;
for ( 1 .. 20_000 ){
$h{1}{$_}=1;
$h{'$_'}{$_}=$_;
$h{'undef'}{$_}=undef;
$h{'!undef'}{$_}= !undef;
$h{'!!undef'}{$_}= !!undef;
$h{'!!!undef'}{$_}= !!!undef;
$h{'sv_yes'}{$_}= !0;
$h{'sv_no'}{$_}= !1;
}
printf "%10s %10s %10s\n", 'value', 'size', 'total_size';
printf "%10s %10d %10d\n",$_, size($h{$_}),total_size($h{$_}) for
+sort keys %h;
}
ActivePerl Build 813, perl, v5.8.7 built for MSWin32-x86-multi-thread
value size total_size
!!!undef 660026 1420026
!!undef 660026 1400026
!undef 660026 1420026
$_ 660026 1328920
1 660026 980026
sv_no 660026 1400026
sv_yes 660026 1420026
undef 660026 900026
strawberry-perl-5.10.0.1-1.exe , v5.10.0 built for MSWin32-x86-multi-thread
value size total_size
!!!undef 660014 1540014
!!undef 660014 1540014
!undef 660014 1540014
$_ 660014 1616018
1 660014 980014
sv_no 660014 1540014
sv_yes 660014 1540014
undef 660014 980014
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