1 // Copyright (c) 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_IOOBJECT_H_ 6 #define BASE_MAC_SCOPED_IOOBJECT_H_ 7 8 #include <IOKit/IOKitLib.h> 9 10 #include "base/basictypes.h" 11 #include "base/compiler_specific.h" 12 13 namespace base { 14 namespace mac { 15 16 // Just like ScopedCFTypeRef but for io_object_t and subclasses. 17 template<typename IOT> 18 class ScopedIOObject { 19 public: 20 typedef IOT element_type; 21 22 explicit ScopedIOObject(IOT object = IO_OBJECT_NULL) 23 : object_(object) { 24 } 25 26 ~ScopedIOObject() { 27 if (object_) 28 IOObjectRelease(object_); 29 } 30 31 void reset(IOT object = IO_OBJECT_NULL) { 32 if (object_) 33 IOObjectRelease(object_); 34 object_ = object; 35 } 36 37 bool operator==(IOT that) const { 38 return object_ == that; 39 } 40 41 bool operator!=(IOT that) const { 42 return object_ != that; 43 } 44 45 operator IOT() const { 46 return object_; 47 } 48 49 IOT get() const { 50 return object_; 51 } 52 53 void swap(ScopedIOObject& that) { 54 IOT temp = that.object_; 55 that.object_ = object_; 56 object_ = temp; 57 } 58 59 IOT release() WARN_UNUSED_RESULT { 60 IOT temp = object_; 61 object_ = IO_OBJECT_NULL; 62 return temp; 63 } 64 65 private: 66 IOT object_; 67 68 DISALLOW_COPY_AND_ASSIGN(ScopedIOObject); 69 }; 70 71 } // namespace mac 72 } // namespace base 73 74 #endif // BASE_MAC_SCOPED_IOOBJECT_H_ 75
