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_CFTYPEREF_H_ 6 #define BASE_MAC_SCOPED_CFTYPEREF_H_ 7 8 #include <CoreFoundation/CoreFoundation.h> 9 10 #include "base/mac/scoped_typeref.h" 11 12 namespace base { 13 14 // ScopedCFTypeRef<> is patterned after std::unique_ptr<>, but maintains 15 // ownership of a CoreFoundation object: any object that can be represented 16 // as a CFTypeRef. Style deviations here are solely for compatibility with 17 // std::unique_ptr<>'s interface, with which everyone is already familiar. 18 // 19 // By default, ScopedCFTypeRef<> takes ownership of an object (in the 20 // constructor or in reset()) by taking over the caller's existing ownership 21 // claim. The caller must own the object it gives to ScopedCFTypeRef<>, and 22 // relinquishes an ownership claim to that object. ScopedCFTypeRef<> does not 23 // call CFRetain(). This behavior is parameterized by the |OwnershipPolicy| 24 // enum. If the value |RETAIN| is passed (in the constructor or in reset()), 25 // then ScopedCFTypeRef<> will call CFRetain() on the object, and the initial 26 // ownership is not changed. 27 28 namespace internal { 29 30 template <typename CFT> 31 struct ScopedCFTypeRefTraits { InvalidValueScopedCFTypeRefTraits32 static CFT InvalidValue() { return nullptr; } RetainScopedCFTypeRefTraits33 static CFT Retain(CFT object) { 34 CFRetain(object); 35 return object; 36 } ReleaseScopedCFTypeRefTraits37 static void Release(CFT object) { CFRelease(object); } 38 }; 39 40 } // namespace internal 41 42 template <typename CFT> 43 using ScopedCFTypeRef = 44 ScopedTypeRef<CFT, internal::ScopedCFTypeRefTraits<CFT>>; 45 46 } // namespace base 47 48 #endif // BASE_MAC_SCOPED_CFTYPEREF_H_ 49