module/srfi/srfi-16.scm

   1 ;;; srfi-16.scm --- case-lambda
   2
   3 ;; Copyright (C) 2001, 2002, 2006, 2009, 2014 Free Software Foundation, Inc.
   4 ;;
   5 ;; This library is free software; you can redistribute it and/or
   6 ;; modify it under the terms of the GNU Lesser General Public
   7 ;; License as published by the Free Software Foundation; either
   8 ;; version 3 of the License, or (at your option) any later version.
   9 ;;
  10 ;; This library is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 ;; Lesser General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the GNU Lesser General Public
  16 ;; License along with this library; if not, write to the Free Software
  17 ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18
  19 ;;; Author: Martin Grabmueller
  20
  21 ;;; Commentary:
  22
  23 ;; Implementation of SRFI-16.  `case-lambda' is a syntactic form
  24 ;; which permits writing functions acting different according to the
  25 ;; number of arguments passed.
  26 ;;
  27 ;; The syntax of the `case-lambda' form is defined in the following
  28 ;; EBNF grammar.
  29 ;;
  30 ;; <case-lambda>
  31 ;;    --> (case-lambda <case-lambda-clause>)
  32 ;; <case-lambda-clause>
  33 ;;    --> (<signature> <definition-or-command>*)
  34 ;; <signature>
  35 ;;    --> (<identifier>*)
  36 ;;      | (<identifier>* . <identifier>)
  37 ;;      | <identifier>
  38 ;;
  39 ;; The value returned by a `case-lambda' form is a procedure which
  40 ;; matches the number of actual arguments against the signatures in
  41 ;; the various clauses, in order.  The first matching clause is
  42 ;; selected, the corresponding values from the actual parameter list
  43 ;; are bound to the variable names in the clauses and the body of the
  44 ;; clause is evaluated.
  45
  46 ;;; Code:
  47
  48 (define-module (srfi srfi-16)
  49   #:re-export (case-lambda))
  50
  51 ;; Case-lambda is now provided by core psyntax.