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fare-memoizationfunctools

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This library is used by cl-vcr, reviewed yesterday.

Previously I've used another library for caching function results and fare-memoization seems interesting because it allows to "memoize" any function unless it is inlined.

Also, this "memoization" effect can be undone:

POFTHEDAY> (defun foo (a b)
             "Waits 5 seconds and multiplies a and b."
             (sleep 5)
             (* a b))

POFTHEDAY> (time (foo 2 3))
Evaluation took:
  5.003 seconds of real time

6

POFTHEDAY> (time (foo 2 3))
Evaluation took:
  5.005 seconds of real time
  
6

POFTHEDAY> (fare-memoization:memoize 'foo)

;; This call will cache it's result:
POFTHEDAY> (time (foo 2 3))
Evaluation took:
  5.004 seconds of real time
  
6

;; And next call will return immediately:
POFTHEDAY> (time (foo 2 3))
Evaluation took:
  0.000 seconds of real time
  
6

;; Now we'll undone the effect:
POFTHEDAY> (fare-memoization:unmemoize 'foo)

POFTHEDAY> (time (foo 2 3))
Evaluation took:
  5.005 seconds of real time
  
6

There is also a macro to define memoized functions and apply/funcall and remember results. The only thing I miss is the ability to cache results for a given amount of time.

Read the documentation, @ngnghm did a very good job!