phillip.l...@newcastle.ac.uk (Phillip Lord) writes:
>> I use satisfies? for optional features, e.g., if some data structure
>> satisfies some protocol, then that optional feature is enabled, else
>> it's disabled. But that's not really on a hot path so I don't care
>> much about satisfies? performance.
>
> Have you tried just implementing the protocol over Object to do
> nothing? Then putting use an alternative implementation of the
> protocol where you want.
I really use it for optional features for which no alternative
implementation exists. Concretely, I have a library that can work with
several graph data structures in a uniform way. Some of them have
first-class edges, others only have references. For example, my lib has
a code generation facility where there's some code like
(when (satisfies? IEdges type-graph)
(generate-edge-access-fns ...))
But for other stuff I do extend protocols to Object (and nil) providing
a default implementation.
Bye,
Tassilo
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