Page Speed Optimization Libraries
1.4.26.1
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00001 /* 00002 * Copyright 2012 Google Inc. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http:///www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00018 00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_MANUALLY_REF_COUNTED_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_MANUALLY_REF_COUNTED_H_ 00021 00022 #include "base/logging.h" 00023 #include "net/instaweb/util/public/atomic_int32.h" 00024 #include "net/instaweb/util/public/basictypes.h" 00025 00026 namespace net_instaweb { 00027 00031 class ManuallyRefCounted { 00032 public: 00033 ManuallyRefCounted() : n_active(1) {} 00034 00038 void IncrementRefs() { 00039 n_active.NoBarrierIncrement(1); 00040 } 00041 00052 void DecrementRefs() { 00053 int n_others_active = n_active.BarrierIncrement(-1); 00054 if (n_others_active == 0) { 00055 delete this; 00056 } 00057 } 00058 00059 protected: 00063 virtual ~ManuallyRefCounted() { 00064 DCHECK_EQ(0, n_active.value()); 00065 } 00066 00067 private: 00068 AtomicInt32 n_active; 00069 00070 DISALLOW_COPY_AND_ASSIGN(ManuallyRefCounted); 00071 }; 00072 00073 } 00074 00075 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_MANUALLY_REF_COUNTED_H_