1 // Copyright 2013 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_MAC_SCOPED_BLOCK_H_ 6 #define BASE_MAC_SCOPED_BLOCK_H_ 7 8 #include <Block.h> 9 10 #include "base/mac/scoped_typeref.h" 11 12 #if defined(__has_feature) && __has_feature(objc_arc) 13 #error "Cannot include base/mac/scoped_block.h in file built with ARC." 14 #endif 15 16 namespace base::mac { 17 18 namespace internal { 19 20 template <typename B> 21 struct ScopedBlockTraits { InvalidValueScopedBlockTraits22 static B InvalidValue() { return nullptr; } RetainScopedBlockTraits23 static B Retain(B block) { return Block_copy(block); } ReleaseScopedBlockTraits24 static void Release(B block) { Block_release(block); } 25 }; 26 27 } // namespace internal 28 29 // ScopedBlock<> is patterned after ScopedCFTypeRef<>, but uses Block_copy() and 30 // Block_release() instead of CFRetain() and CFRelease(). 31 template <typename B> 32 using ScopedBlock = ScopedTypeRef<B, internal::ScopedBlockTraits<B>>; 33 34 } // namespace base::mac 35 36 #endif // BASE_MAC_SCOPED_BLOCK_H_ 37