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defstruct
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  2. defstruct
    1. Description
    2. Author
    3. Requirements
    4. Download
    5. Documentation
    6. License

Description

A more convenient form of define-record

Author

Dorai Sitaram, ported to CHICKEN by felix winkelmann

Requirements

None

Download

defstruct.egg

Documentation

[syntax] (defstruct NAME SLOT ...)

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):

(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
  ...)

Additionally, a constructor procedure make-STRUCTNAME is defined, which accepts initialization values for all slots specified as keyword arguments:

(make-point x: 99 y: 42)
 => ; a point with x = 99 and y = 42

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.