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. isa?* is
used to determine whether a relationship between x and y that precludes this preference already exists; it can
be clojure.core/isa?, perhaps partially bound with a hierarchy, or some other 2-arg predicate function.
Add a method preference to `prefs` for dispatch value `x` over `y`. Used to implement `prefer-method`. `isa?*` is used to determine whether a relationship between `x` and `y` that precludes this preference already exists; it can be `clojure.core/isa?`, perhaps partially bound with a hierarchy, or some other 2-arg predicate function.
(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.
(distinct-by f coll)Like distinct, but uses value of (f item) to determine whether to keep each item in the resulting collection.
Like `distinct`, but uses value of `(f item)` to determine whether to keep each `item` in the resulting collection.
(dominates? hierarchy prefs x y)True if dispatch value x should be considered more specific for purposes of method combination over dispatch value
y, e.g. because x derives from y, or because x (or one of its ancestors) has been explicitly preferred over
y (or one of its ancestors).
True if dispatch value `x` should be considered more specific for purposes of method combination over dispatch value `y`, e.g. because `x` derives from `y`, or because `x` (or one of its ancestors) has been explicitly preferred over `y` (or one of its ancestors).
(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.
(prefers? hierarchy prefs x y)True if x or one of its ancestors is prefered over y or one of its ancestors.
True if `x` or one of its ancestors is prefered over `y` or one of its ancestors.
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