On Mar 24, 2009, at 11:19, mikel wrote:
> Dispatch is wholly deterministic; you never need prefer-method. There
Then what is the rule for choosing one method when there are several
that match the arguments?
> In the scope in which a generic function is applied, next-method is
> always bound to the next applicable method in a total ordering of
> applicable methods for the arguments supplied (see the first
> java.lang.Integer method below for an example of how to use next-
> method). applicable-methods is always bound to a function that returns
> a list of applicable methods, ordered from most- to least-specific;
> next-method is equal to (first (applicable-methods)).
So I guess that the chosen method is the first one in the applicable-
methods list, meaning the "most specific" one. The question is then
how "specificity" is defined, in particular for multiple argument
dispatch. Suppose in your example that I provide
(define-method add [x y] ...)
(define-method add [[x java.lang.Integer] y] ...)
(define-method add [x [y java.lang.Integer]] ...)
and call (add 3 3). Which of the methods is chosen?
Konrad.
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