Recipe 4.1: Declaring Multiple Inheritance

Last Updated: Sep 8, 2003 Status: Very Likely

Problem:  

You want your class to inherit from more than one parent class.

Solution:  

Specify a list after is:

class MyClass is Parent1 is Parent2 is Parent3 {
    ...
}

Discussion:

Perl6 supports multiple inheritance. To inherit from multiple parent classes, just specify each of those classes in the class declaration, as above.

Order is important. When searching through the parents of a class (to find the implementation of a method, for example), parents are always searched left-to-right. If a method exists in Parent1, it will take precedence over any method of the same name in Parent2, etc.

Issue: Are inheritance trees searched depth-first, as before? Any way around that?

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