perlquestion
Anonymous Monk
<p> I have a package car. What i need is a variable that counts the number of objects derived from this class. Say i have a car rental company and want to keep track of the number of cars being rented, each time a car object is being created means 1 car has been rented. I have been looking on the internet but can't find anything. How can i do this(if possible at all)? Here is the car.pm file:</p>
<code>use strict;
use warnings;
package car;
sub new {
my $class = shift;
my $self = {
name => shift,
price => shift,
speed => 0
};
print "Object car being created:\n";
print "Name: $self->{name}\n";
print "price: $self->{price}\n\n";
bless $self, $class;
return $self;
}
sub speed_up{
my $self = shift;
my $acc = shift;
$self->{speed} += $acc;
return $self->{speed};
}
sub slow_down{
my $self = shift;
my $acc = shift;
$self->{speed} -= $acc;
return $self->{speed};
}
1;
</code><p> Here is an example of a belonging .pl file: </p><code>
use strict;
use warnings;
use car;
my $speed;
my $auto = new car("Opel Vectra",50000);
$speed = $auto->speed_up(25);
print "Speed is: $speed km\n";
$speed = $auto->speed_up(10);
print "Speed is: $speed km\n";
$speed = $auto->slow_down(20);
print "Speed is: $speed km\n";
</code>
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