manually_ref_counted.h

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/*
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http:///www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#ifndef PAGESPEED_KERNEL_BASE_MANUALLY_REF_COUNTED_H_
#define PAGESPEED_KERNEL_BASE_MANUALLY_REF_COUNTED_H_

#include "base/logging.h"
#include "pagespeed/kernel/base/atomic_int32.h"
#include "pagespeed/kernel/base/basictypes.h"

namespace net_instaweb {

class ManuallyRefCounted {
 public:
  ManuallyRefCounted() : n_active(1) {}

  void IncrementRefs() {
    n_active.NoBarrierIncrement(1);
  }

  void DecrementRefs() {
    int n_others_active = n_active.BarrierIncrement(-1);
    if (n_others_active == 0) {
      delete this;
    }
  }

 protected:
  virtual ~ManuallyRefCounted() {
    DCHECK_EQ(0, n_active.value());
  }

 private:
  AtomicInt32 n_active;

  
};

}  

#endif