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| 1 // Copyright 2012 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_CFFILEDESCRIPTORREF_H_ | |
| 6 #define BASE_MAC_SCOPED_CFFILEDESCRIPTORREF_H_ | |
| 7 | |
| 8 #include <CoreFoundation/CoreFoundation.h> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/compiler_specific.h" | |
| 12 | |
| 13 namespace base { | |
| 14 namespace mac { | |
| 15 | |
| 16 // ScopedCFFileDescriptorRef is designed after ScopedCFTypeRef<>. On | |
| 17 // destruction, it will invalidate the file descriptor. | |
| 18 // ScopedCFFileDescriptorRef (unlike ScopedCFTypeRef<>) does not support RETAIN | |
| 19 // semantics, copying, or assignment, as doing so would increase the chances | |
| 20 // that a file descriptor is invalidated while still in use. | |
| 21 class ScopedCFFileDescriptorRef { | |
| 22 public: | |
| 23 explicit ScopedCFFileDescriptorRef(CFFileDescriptorRef fdref = NULL) | |
| 24 : fdref_(fdref) { | |
| 25 } | |
| 26 | |
| 27 ~ScopedCFFileDescriptorRef() { | |
| 28 if (fdref_) { | |
| 29 CFFileDescriptorInvalidate(fdref_); | |
| 30 CFRelease(fdref_); | |
| 31 } | |
| 32 } | |
| 33 | |
| 34 void reset(CFFileDescriptorRef fdref = NULL) { | |
| 35 if (fdref_ == fdref) | |
| 36 return; | |
| 37 if (fdref_) { | |
| 38 CFFileDescriptorInvalidate(fdref_); | |
| 39 CFRelease(fdref_); | |
| 40 } | |
| 41 fdref_ = fdref; | |
| 42 } | |
| 43 | |
| 44 bool operator==(CFFileDescriptorRef that) const { | |
| 45 return fdref_ == that; | |
| 46 } | |
| 47 | |
| 48 bool operator!=(CFFileDescriptorRef that) const { | |
| 49 return fdref_ != that; | |
| 50 } | |
| 51 | |
| 52 operator CFFileDescriptorRef() const { | |
| 53 return fdref_; | |
| 54 } | |
| 55 | |
| 56 CFFileDescriptorRef get() const { | |
| 57 return fdref_; | |
| 58 } | |
| 59 | |
| 60 CFFileDescriptorRef release() WARN_UNUSED_RESULT { | |
| 61 CFFileDescriptorRef temp = fdref_; | |
| 62 fdref_ = NULL; | |
| 63 return temp; | |
| 64 } | |
| 65 | |
| 66 private: | |
| 67 CFFileDescriptorRef fdref_; | |
| 68 | |
| 69 DISALLOW_COPY_AND_ASSIGN(ScopedCFFileDescriptorRef); | |
| 70 }; | |
| 71 | |
| 72 } // namespace mac | |
| 73 } // namespace base | |
| 74 | |
| 75 #endif // BASE_MAC_SCOPED_CFFILEDESCRIPTORREF_H_ | |
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