A Monotonic Superclass Linearization for Dylan. Kim Barrett . Bob Cassels [email protected]>. Paul Haahr. In computing, the C3 superclass linearization is an algorithm used primarily to obtain the order It was first published at the OOPSLA conference, in a paper entitled “A Monotonic Superclass Linearization for Dylan”. It was adapted to the. The C3 superclass linearization algorithm is more intuitive and allows for greater monotonicity of method orderings, a consistent superclass linearization.

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Recent work has defined several desirable characteristics for linearizations, the most important being monotonicity, which prohibits inherited properties from skipping over direct superclasses. Mark Stefik 32 Estimated H-index: Look-based selection for rendering a computer-generated animation. Note, that a good head may appear as the first element in multiple lists at monotonicc same time, but it is forbidden to appear anywhere else.

The art of metaobject protocol. Baker 3 Estimated H-index: This page was last edited on 28 Aprilat In order to allow for more optimizations, especially compression of dispatch tables, which requires monotonicity of method orderings, a consistent superclass linearization algorithm is needed.

CiteSeerX — A Monotonic Superclass Linearization for Dylan

Moon, Keith Playford, P. Cited Source Add To Collection.

There might be a discussion about this on the talk page. The Dylan linearization is monotonic, easily described, strictly observes local precedence order, and produces the same ordering as CLOS when that is monotonic. An information-driven architecture for cognitive systems research.

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Views Read Edit View history. This article may be confusing or unclear to readers. Combined with Dylan’s sealing mechanism, a monotonic linearization enables some compile-time method selection that would otherwise be montoonic in the absence of a closed-world assumption.

Advanced Search Include Citations Disambiguate. Moon and Keith Playford superclsas P. Retrieved August 14, Dyoan, Keith Playford, and P. The Dylan superclass linearization is sometimes counter-intuitive. To detect such a cycle and to break the infinite recursion and to reuse the results of previous computations as an optimizationthe recursive invocation should be shielded against re-entrance of a previous argument by means of a cache or memoization.

However, this will result in an infinitely looping recursion in the presence of a cyclic class hierarchy.

A Monotonic Superclass Linearization for Dylan

The C3 superclass linearization algorithm is more intuitive and allows for greater optimization. Bertrand Meyer 38 Estimated H-index: Monotonic conflict resolution mechanisms for inheritance.

Moon 4 Estimated Superclasz The C3 linearization has been around for a long time, does not break any existing code, and is commonly agreed upon as being the right thing to do in mailing list discussions.

The C3 superclass linearization of a class is the sum of the class plus a unique merge of lineariization linearizations of its parents and a list of the parents itself. Object-oriented programming with flavors.

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C3 linearization

Advanced Search Include Citations. Gregor Kiczales 39 Estimated H-index: In the first release a serious warning will be issued for superclass linearization which changed, in subsequent releases a warning should be issued depending on a strict compatibility to DRM linewrization. The History of Python.

Object-oriented programming Programming language implementation.

View in Source Cite this paper. Monotonif computingthe C3 superclass linearization is an algorithm used primarily to obtain the order in which methods should be inherited the “linearization” in the presence of multiple inheritanceand is often termed Method Resolution Order MRO. A naive divide and linearizwtion approach to computing the linearization of a class may invoke the algorithm recursively to find the linearizations of parent classes for the merge-subroutine.

Please help us clarify the article. The merge of parents’ linearizations and parents list is done by selecting the first head of the lists which does not appear in the tail all elements of a list except the first of any of the lists.