Humm, don't forget that Perl uses a special variable @_ for the arguments. What you can't forget is that this array @_ is global, but it's elements will change for each call. So, the performance of @_ will be similar to a global variable, but will work as a stack, so, will work for multiple calls of the same sub and recursivelly.
This code will show that:
sub test1 {
++$_[0] ;
print "T1 [@_]\n" ;
test2($_[0]) ;
}
sub test2 {
++$_[0] ;
print "T2 [@_]\n" ;
test3($_[0]) ;
}
sub test3 {
++$_[0] ;
print "T3 [@_]\n" ;
print "end\n" ;
}
my $n = 10 ;
test1($n) ;
print "N: $n\n" ;
output:
T1 [11]
T2 [12]
T3 [13]
end
N: 13
And forget the use of a global variable for any type of code and start learning OO. Take a look at
perlobj,
perltoot,
perlboot and
perltooc.
For Object Orientation (OO) I use Class::HPLOO.
Graciliano M. P.
"Creativity is the expression of the liberty".