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;; memoize.jl -- create caching-enabled functions
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;; Copyright (C) 2000 John Harper <john@dcs.warwick.ac.uk>
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;; $Id: memoize.jl,v 1.5 2000/07/23 22:24:33 john Exp $
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;; This file is part of librep.
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;; librep is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; librep is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with librep; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(define-structure rep.util.memoize
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(export memoize memoize-function)
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(define-structure-alias memoize rep.util.memoize)
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"Create and return a caching version of the function F. F may not be
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an autoload definition."
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(error "can only memoize functions: %s" f))
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(let ((cache (make-table equal-hash equal)))
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(or (table-ref cache args)
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(table-set cache args (apply f args))))))
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;; backwards compatibility
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(define memoize-function memoize))
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lisp/rep/util/memoize.jl
