1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // Base class for reference counted objects in Minikin 18 19 #ifndef MINIKIN_REF_COUNTED_H 20 #define MINIKIN_REF_COUNTED_H 21 22 namespace android { 23 24 class MinikinRefCounted { 25 public: RefLocked()26 void RefLocked() { mRefcount_++; } UnrefLocked()27 void UnrefLocked() { if (--mRefcount_ == 0) { delete this; } } 28 29 // These refcount operations take the global lock. 30 void Ref(); 31 void Unref(); 32 MinikinRefCounted()33 MinikinRefCounted() : mRefcount_(1) { } 34 ~MinikinRefCounted()35 virtual ~MinikinRefCounted() { }; 36 private: 37 int mRefcount_; 38 }; 39 40 // An RAII container for reference counted objects. 41 // Note: this is only suitable for clients which are _not_ holding the global lock. 42 template <typename T> 43 class MinikinAutoUnref { 44 public: MinikinAutoUnref(T * obj)45 MinikinAutoUnref(T* obj) : mObj(obj) { 46 } ~MinikinAutoUnref()47 ~MinikinAutoUnref() { 48 mObj->Unref(); 49 } 50 T& operator*() const { return *mObj; } 51 T* operator->() const { return mObj; } get()52 T* get() const { return mObj; } 53 private: 54 T* mObj; 55 }; 56 57 } 58 59 #endif // MINIKIN_REF_COUNTED_H