keychain/ot/ObjCImprovements.h

   1 /*
   2  * Copyright (c) 2019 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef ObjCImprovements_h
  25 #define ObjCImprovements_h
  26
  27 // Useful for never getting retain loops with blocks.
  28 #define WEAKIFY(n) __weak __typeof(n) weak_##n = n
  29
  30 #define STRONGIFY(n) _Pragma("clang diagnostic push")\
  31 _Pragma("clang diagnostic ignored \"-Wshadow\"") \
  32 __strong __typeof(n) n = weak_##n; \
  33 _Pragma("clang diagnostic pop");
  34
  35
  36 #endif /* ObjCImprovements_h */