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| 1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | |
| 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/basictypes.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 #include "base/memory/scoped_policy.h" | |
| 13 | |
| 14 namespace base { | |
| 15 namespace mac { | |
| 16 | |
| 17 // ScopedBlock<> is patterned after ScopedCFTypeRef<>, but uses Block_copy() and | |
| 18 // Block_release() instead of CFRetain() and CFRelease(). | |
| 19 | |
| 20 template<typename B> | |
| 21 class ScopedBlock { | |
| 22 public: | |
| 23 explicit ScopedBlock( | |
| 24 B block = NULL, | |
| 25 base::scoped_policy::OwnershipPolicy policy = base::scoped_policy::ASSUME) | |
| 26 : block_(block) { | |
| 27 if (block_ && policy == base::scoped_policy::RETAIN) | |
| 28 block_ = Block_copy(block); | |
| 29 } | |
| 30 | |
| 31 ScopedBlock(const ScopedBlock<B>& that) | |
| 32 : block_(that.block_) { | |
| 33 if (block_) | |
| 34 block_ = Block_copy(block_); | |
| 35 } | |
| 36 | |
| 37 ~ScopedBlock() { | |
| 38 if (block_) | |
| 39 Block_release(block_); | |
| 40 } | |
| 41 | |
| 42 ScopedBlock& operator=(const ScopedBlock<B>& that) { | |
| 43 reset(that.get(), base::scoped_policy::RETAIN); | |
| 44 return *this; | |
| 45 } | |
| 46 | |
| 47 void reset(B block = NULL, | |
| 48 base::scoped_policy::OwnershipPolicy policy = | |
| 49 base::scoped_policy::ASSUME) { | |
| 50 if (block && policy == base::scoped_policy::RETAIN) | |
| 51 block = Block_copy(block); | |
| 52 if (block_) | |
| 53 Block_release(block_); | |
| 54 block_ = block; | |
| 55 } | |
| 56 | |
| 57 bool operator==(B that) const { | |
| 58 return block_ == that; | |
| 59 } | |
| 60 | |
| 61 bool operator!=(B that) const { | |
| 62 return block_ != that; | |
| 63 } | |
| 64 | |
| 65 operator B() const { | |
| 66 return block_; | |
| 67 } | |
| 68 | |
| 69 B get() const { | |
| 70 return block_; | |
| 71 } | |
| 72 | |
| 73 void swap(ScopedBlock& that) { | |
| 74 B temp = that.block_; | |
| 75 that.block_ = block_; | |
| 76 block_ = temp; | |
| 77 } | |
| 78 | |
| 79 B release() WARN_UNUSED_RESULT { | |
| 80 B temp = block_; | |
| 81 block_ = NULL; | |
| 82 return temp; | |
| 83 } | |
| 84 | |
| 85 private: | |
| 86 B block_; | |
| 87 }; | |
| 88 | |
| 89 } // namespace mac | |
| 90 } // namespace base | |
| 91 | |
| 92 #endif // BASE_MAC_SCOPED_BLOCK_H_ | |
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