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It happens often in LPC. It's a language mostly used for building MUDs. Often you will have a standard weapon class and a standard wearable class. All weapons inherit from the weapon class, while all wearables inherit from the wearable class. But boxing gloves would inherit from both.

Some problems LPC has with multiple inheritance aren't found in Perl (for instance, the possibility of duplicating variables when a class is inherited by two paths - different implementations of LPC solve it differently). Other things are solved differently, for instance, one flavour of LPC forbids inheriting from two classes if they have methods with the same name - unless the inheriting class defines a method with that same name.

There is nothing wrong with multiple inheritance. It's just hard to implement is right, which is way some languages take the easy way out and outright forbid it. Inheritance is already a hard problem in Perl, but multiple inheritance is a real nightmare. But that's the fault of Perl, not of multiple inheritance.

Abigail


In reply to Re: RFC: Class::DispatchToAll by Abigail-II
in thread RFC: Class::DispatchToAll by domm

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