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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/defstruct|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == defstruct [[toc:]] === Description A more convenient form of {{define-record}} === Author Dorai Sitaram, ported to CHICKEN by [[/users/felix winkelmann|felix winkelmann]] === Requirements None === Download [[http://code.call-cc.org/legacy-eggs/3/defstruct.egg|defstruct.egg]] === Documentation <macro>(defstruct NAME SLOT ...)</macro> Defines a record type with the name {{NAME}}. {{SLOT}} may be a symbol or a list of the form {{(NAME INIT)}} where {{INIT}} is the default value of the slot (the {{INIT}} expression will only be evaluated when no value is given in the constructor procedure). The {{defstruct}} macro expand into predicate and accessor functions (just like the native {{define-record}}): <enscript highlight="scheme"> (defstruct point x y) ;; Creates code equivalent to the following: (begin (define (point? x) ...) ; is x a point? (define (point-x p) ...) ; return x slot of point p (define (point-x-set! p n) ...) ; change x slot of point p to n ...) </enscript> Additionally, a constructor procedure {{make-STRUCTNAME}} is defined, which accepts initialization values for all slots specified as keyword arguments: <enscript highlight="scheme"> (make-point x: 99 y: 42) => ; a point with x = 99 and y = 42 </enscript> === License Copyright (c) 2005, Dorai Sitaram All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. Neither the name of the author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Description of your changes:

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