Utility functions for implementing Dispatchers.
Utility functions for implementing Dispatchers.
(add-preference isa?* prefs x y)
Add a method preference to prefs
for dispatch value x
over y
. Used to implement prefer-method
.
Add a method preference to `prefs` for dispatch value `x` over `y`. Used to implement `prefer-method`.
(ambiguous? hierarchy prefs dispatch-value dispatch-val-x dispatch-val-y)
True if neither dispatch-val-x
nor dispatch-val-y
dominate one another, e.g. because they are the same value or
are both equally-specific ancestors.
True if neither `dispatch-val-x` nor `dispatch-val-y` dominate one another, e.g. because they are the same value or are both equally-specific ancestors.
(dominates? hierarchy prefs x y)
True if dispatch-val-x
should be considered more specific for purposes of method combination over dispatch-val-y
,
e.g. because x
derives from y
or because x
has been preferred over y
.
True if `dispatch-val-x` should be considered more specific for purposes of method combination over `dispatch-val-y`, e.g. because `x` derives from `y` or because `x` has been preferred over `y`.
(domination-comparitor hierarchy prefs dispatch-value)
Given a hierarchy prefs
return a function that can be used to sort dispatch values from most-specific to
least-specific.
Given a `hierarchy prefs` return a function that can be used to sort dispatch values from most-specific to least-specific.
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