Commit a2284097 authored by Liam M. Healy's avatar Liam M. Healy
Browse files

New macro access-value

New macro access-value to call gsl_*_set and gsl_*_get, as yet unused.
It will eventually replace get-value and (setf get-value) as used in
reference-foreign-element, but has the arguments in the right order
and because it's a macro, expands immediately to a
cffi:foreign-funcall instead of doing a generic function dispatch on
an eql spcializer of the class name.
parent a27a80a1
;; Functions for both vectors and matrices.
;; Liam Healy 2008-04-26 20:48:44EDT both.lisp
;; Time-stamp: <2010-07-13 21:46:11EDT both.lisp>
;; Time-stamp: <2010-11-24 15:12:33EST both.lisp>
;; Copyright 2008, 2009 Liam M. Healy
;; Copyright 2008, 2009, 2010 Liam M. Healy
;; Distributed under the terms of the GNU General Public License
;; This program is free software: you can redistribute it and/or modify
......@@ -85,6 +85,33 @@
;;; avoid the overhead of instantiating a foreign-array object to
;;; access components, we use these functions.
(defmacro access-value (mpointer class-name value &rest indices)
"Access the GSL array value from the mpointer. If value is not nil,
set the value; otherwise, get the value."
;; (access-value ptr grid:vector-unsigned-byte-16 45 3)
;; (access-value ptr grid:matrix-unsigned-byte-16 nil 45 3)
;; (access-value ptr grid:matrix-unsigned-byte-16 45 3)
;; => error
(let ((element-type (grid::farray-element-type class-name))
(matrixp (subtypep class-name 'grid:matrix)))
(unless (or (and matrixp (eql 2 (length indices)))
(and (not matrixp) (eql 1 (length indices))))
(error "The number of indices, ~a, is not correct for an array of class ~a"
(length indices)
`("gsl_" :category :type ,(if value "_set" "_get"))
(if matrixp 'matrix 'vector)
:pointer ,mpointer
sizet ,(first indices)
,@(when matrixp (list 'sizet (second indices)))
,(grid:cl-cffi element-type)
,@(when value `(,value :void)))))
(defmfun get-value ((class-name (eql vector)) mpointer &rest indices)
("gsl_" :category :type "_get")
((mpointer :pointer) ((first indices) sizet))
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