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extend-protocol

clojure.core

Available since 1.2 (source)
  • (extend-protocol p & specs)
Useful when you want to provide several implementations of the same
protocol all at once. Takes a single protocol and the implementation
of that protocol for one or more types. Expands into calls to
extend-type:
 (extend-protocol Protocol
  AType
    (foo [x] ...)
    (bar [x y] ...)
  BType
    (foo [x] ...)
    (bar [x y] ...)
  AClass
    (foo [x] ...)
    (bar [x y] ...)
  nil
    (foo [x] ...)
    (bar [x y] ...))
 expands into:
 (do
 (clojure.core/extend-type AType Protocol 
   (foo [x] ...) 
   (bar [x y] ...))
 (clojure.core/extend-type BType Protocol 
   (foo [x] ...) 
   (bar [x y] ...))
 (clojure.core/extend-type AClass Protocol 
   (foo [x] ...) 
   (bar [x y] ...))
 (clojure.core/extend-type nil Protocol 
   (foo [x] ...) 
   (bar [x y] ...)))