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_IOPLUGININTERFACE_H_ 6 #define BASE_MAC_SCOPED_IOPLUGININTERFACE_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 IOCFPlugInInterface and friends 17 // (IOUSBInterfaceStruct and IOUSBDeviceStruct320 in particular). 18 template<typename T> 19 class ScopedIOPluginInterface { 20 public: 21 typedef T** InterfaceT; 22 typedef InterfaceT element_type; 23 24 explicit ScopedIOPluginInterface(InterfaceT object = NULL) 25 : object_(object) { 26 } 27 28 ~ScopedIOPluginInterface() { 29 if (object_) 30 (*object_)->Release(object_); 31 } 32 33 void reset(InterfaceT object = NULL) { 34 if (object_) 35 (*object_)->Release(object_); 36 object_ = object; 37 } 38 39 bool operator==(InterfaceT that) const { 40 return object_ == that; 41 } 42 43 bool operator!=(InterfaceT that) const { 44 return object_ != that; 45 } 46 47 operator InterfaceT() const { 48 return object_; 49 } 50 51 InterfaceT get() const { 52 return object_; 53 } 54 55 void swap(ScopedIOPluginInterface& that) { 56 InterfaceT temp = that.object_; 57 that.object_ = object_; 58 object_ = temp; 59 } 60 61 InterfaceT release() WARN_UNUSED_RESULT { 62 InterfaceT temp = object_; 63 object_ = NULL; 64 return temp; 65 } 66 67 private: 68 InterfaceT object_; 69 70 DISALLOW_COPY_AND_ASSIGN(ScopedIOPluginInterface); 71 }; 72 73 } // namespace mac 74 } // namespace base 75 76 #endif // BASE_MAC_SCOPED_IOPLUGININTERFACE_H_ 77
