Multi-methods are a straightforward extension of traditional (single) dynamic dispatch, which is the core of most object oriented languages. With multi methods, a method call will select an appropriate implementation based on the values of multiple arguments, and not just the first/receiver. Language support for both single and multiple dispatch is typically designed to be used in conjunction with other object oriented features, in particular classes and inheritance. But are these extra features really necessary?
Mμl is a dynamic language designed to be as simple as possible but still supporting flexible abstraction and polymorphism. Mμl provides only two forms of abstraction: (object) identities and (multi) methods. In Mμl method calls are dispatched based on the identity of arguments, as well as whether other method-calls would successfully dispatch. In order to keep Mμls design simple, when multiple method definitions are applicable, the most recently defined one is chosen, not the most specific (as is conventional with dynamic dispatch).
In this paper we show how by defining methods at runtime, we obtain much of the power of classes and meta object protocols, in particular, the ability to dynamically modify the state and behaviour of ‘classes’ of objects.
Sun 20 OctDisplayed time zone: Beirut change
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|Ambiguous, Informal, and Unsound: Metaprogramming for Naturalness|
|From Definitional Interpreter To Symbolic Executor|
Adrian Mensing , Hendrik van Antwerpen TU Delft, Eelco Visser Delft University of Technology, Casper Bach Poulsen Delft University of TechnologyLink to publication Pre-print
|Mμl: The Power of Dynamic Multi-Methods|
Isaac Oscar Gariano Victoria University of Wellington, Marco Servetto Victoria University Wellington, New ZealandFile Attached