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;;;; Objective-CL, an Objective-C bridge for Common Lisp.
;;;; Copyright (C) 2007, 2008 Matthias Andreas Benkard.
;;;;
;;;; This program 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 program 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 program. If not, see
;;;; <http://www.gnu.org/licenses/>.
(in-package #:mulk.objective-cl)
(defun convert-from-foreign-value (foreign-value-cell typespec
skip-retaining-p char-is-bool-p)
(let ((c-type (typespec->c-type typespec)))
(case (or (typespec-nominal-type typespec)
(typespec-primary-type typespec))
((id objective-c-class exception selector)
(let ((*skip-retaining* skip-retaining-p))
(let ((instance
(intern-pointer-wrapper (typespec-primary-type typespec)
:pointer (cffi:mem-ref
foreign-value-cell
c-type))))
(typecase instance
(lisp-value-wrapper-mixin
(if *skip-value-wrapper-unwrapping*
instance
(lisp-value instance)))
(t instance)))))
((:char :unsigned-char)
;; FIXME? This is non-trivial. See policy.lisp for
;; details.
(objc-char->lisp-value (cffi:mem-ref foreign-value-cell c-type)
char-is-bool-p))
((struct union)
;; The caller is responsible for preventing the return
;; value from being garbage-collected by setting
;; FOREIGN-VALUE-LISP-MANAGED-P to false.
(make-struct-wrapper foreign-value-cell typespec t))
((:void) (values))
(otherwise (cffi:mem-ref foreign-value-cell c-type)))))
;; COERCE-OBJECT is the high-level facility that other parts of
;; Objective-CL may rely on for their conversion needs. Its methods
;; are implemented in type-conversion-policy.lisp.
(defgeneric coerce-object (object type))
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