Overloading in Perl / What is overloading

What is operator overloading

• Imagine you have a class that models fractions

• my $half
    = Number::Fraction->new(1, 2);
  my $quarter 
    = Number::Fraction->new(1, 4);
  my $three_quarters = $half;
  $three_quarters->add($quarter);

• Nasty isn't it
• Also error prone
• Can you spot the bug?