base/refcount.h

/*
 * libjingle
 * Copyright 2011, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef TALK_APP_BASE_REFCOUNT_H_
#define TALK_APP_BASE_REFCOUNT_H_

#include <string.h>

#include "talk/base/criticalsection.h"

namespace talk_base {

// Reference count interface.
class RefCountInterface {
 public:
  virtual int AddRef() = 0;
  virtual int Release() = 0;
 protected:
  virtual ~RefCountInterface() {}
};

template <class T>
class RefCountedObject : public T {
 public:
  RefCountedObject() : ref_count_(0) {
  }

  template<typename P>
  explicit RefCountedObject(P p) : T(p), ref_count_(0) {
  }

  template<typename P1, typename P2>
  RefCountedObject(P1 p1, P2 p2) : T(p1, p2), ref_count_(0) {
  }

  template<typename P1, typename P2, typename P3>
  RefCountedObject(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3), ref_count_(0) {
  }

  template<typename P1, typename P2, typename P3, typename P4>
  RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4)
      : T(p1, p2, p3, p4), ref_count_(0) {
  }

  template<typename P1, typename P2, typename P3, typename P4, typename P5>
  RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
      : T(p1, p2, p3, p4, p5), ref_count_(0) {
  }

  virtual int AddRef() {
    return talk_base::AtomicOps::Increment(&ref_count_);
  }

  virtual int Release() {
    int count = talk_base::AtomicOps::Decrement(&ref_count_);
    if (!count) {
      delete this;
    }
    return count;
  }

 protected:
  virtual ~RefCountedObject() {
  }

  int ref_count_;
};

}  // namespace talk_base

#endif  // TALK_APP_BASE_REFCOUNT_H_