Page Speed Optimization Libraries  1.6.29.3
net/instaweb/util/public/manually_ref_counted.h
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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_
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