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Re: inheritance turns back and bites

by dragonchild (Archbishop)
on Mar 01, 2004 at 14:40 UTC ( #332926=note: print w/ replies, xml ) Need Help??


in reply to inheritance turns back and bites

For the specific question, a better option might be to use overload and do dispatch based on the value you get. Something like:
package SomeData; use overload '+' => 'add', '-' => 'subtract', fallback => 1; sub add { my ($x, $y) = @_[0..1]; ($x, $y) = ($y, $x) if $_[2]; $self->{is_number} ? $x + $y : $x . $y; }

Now, personally, I would never overload + to act as string concatenation. Concatenation isn't commutative, which breaks the implicit contract most people have with addition. As well, how do you define multiplication for strings?

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Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.

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