/* * Copyright (c) 2012,2014 Apple Inc. All Rights Reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef _SECCFRELEASE_H_ #define _SECCFRELEASE_H_ #include <CoreFoundation/CFBase.h> // Retains its argument unless it's NULL. Always returns its argument. #define CFRetainSafe(CF) ({ __typeof__(CF) _cf = (CF); _cf ? (CFRetain(_cf), _cf) : _cf; }) // Assume CF is NULL or an already retained object and CFReleaseSafe VAR and assigns CF to VAR. Returns CF. #define CFAssignRetained(VAR,CF) ({ \ __typeof__(VAR) *const _pvar = &(VAR); \ __typeof__(CF) _cf = (CF); \ (*_pvar) = *_pvar ? (CFRelease(*_pvar), _cf) : _cf; \ }) // CFRetainSafe CF and CFReleaseSafe VAR and assigns CF to VAR. Returns CF. #define CFRetainAssign(VAR,CF) ({ \ __typeof__(VAR) *const _pvar = &(VAR); \ __typeof__(CF) _cf = (CF); \ (((*_pvar) == _cf) ? _cf \ : ((*_pvar) = (_cf ? (CFRetain(_cf), (*_pvar ? (CFRelease(*_pvar), _cf) : _cf)) \ : (CFRelease(*_pvar), ((__typeof__(_cf))0))))); \ }) // Releases CF unless it's NULL. Always returns NULL, for your convenience and constructs like: // return CFReleaseSafe(foo); #define CFReleaseSafe(CF) ({ __typeof__(CF) _cf = (CF); (_cf ? (CFRelease(_cf), ((__typeof__(CF))0)) : _cf); }) // Assigns NULL to CF. Releases the value stored at CF unless it was NULL. Always returns NULL, for your convenience #define CFReleaseNull(CF) ({ __typeof__(CF) *const _pcf = &(CF), _cf = *_pcf; (_cf ? (*_pcf) = ((__typeof__(CF))0), (CFRelease(_cf), ((__typeof__(CF))0)) : _cf); }) #endif /* _SECCFRELEASE_H_ */