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;;; srfi-16.scm --- case-lambda ;; Copyright (C) 2001, 2002, 2006, 2009 Free Software Foundation, Inc. ;; ;; This library is free software; you can redistribute it and/or ;; modify it under the terms of the GNU Lesser General Public ;; License as published by the Free Software Foundation; either ;; version 3 of the License, or (at your option) any later version. ;; ;; This library is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ;; Lesser General Public License for more details. ;; ;; You should have received a copy of the GNU Lesser General Public ;; License along with this library; if not, write to the Free Software ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA ;;; Author: Martin Grabmueller ;;; Commentary: ;; Implementation of SRFI-16. `case-lambda' is a syntactic form ;; which permits writing functions acting different according to the ;; number of arguments passed. ;; ;; The syntax of the `case-lambda' form is defined in the following ;; EBNF grammar. ;; ;; <case-lambda> ;; --> (case-lambda <case-lambda-clause>) ;; <case-lambda-clause> ;; --> (<signature> <definition-or-command>*) ;; <signature> ;; --> (<identifier>*) ;; | (<identifier>* . <identifier>) ;; | <identifier> ;; ;; The value returned by a `case-lambda' form is a procedure which ;; matches the number of actual arguments against the signatures in ;; the various clauses, in order. The first matching clause is ;; selected, the corresponding values from the actual parameter list ;; are bound to the variable names in the clauses and the body of the ;; clause is evaluated. ;;; Code: (define-module (srfi srfi-16) #:re-export (case-lambda)) ;; Case-lambda is now provided by code psyntax. (cond-expand-provide (current-module) '(srfi-16))