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      1 /*
      2  * libjingle
      3  * Copyright 2011, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_APP_BASE_REFCOUNT_H_
     29 #define TALK_APP_BASE_REFCOUNT_H_
     30 
     31 #include <cstring>
     32 
     33 #include "talk/base/criticalsection.h"
     34 
     35 namespace talk_base {
     36 
     37 // Reference count interface.
     38 class RefCountInterface {
     39  public:
     40   virtual int AddRef() = 0;
     41   virtual int Release() = 0;
     42  protected:
     43   virtual ~RefCountInterface() {}
     44 };
     45 
     46 template <class T>
     47 class RefCountedObject : public T {
     48  public:
     49   RefCountedObject() : ref_count_(0) {
     50   }
     51 
     52   template<typename P>
     53   explicit RefCountedObject(P p) : T(p), ref_count_(0) {
     54   }
     55 
     56   template<typename P1, typename P2>
     57   RefCountedObject(P1 p1, P2 p2) : T(p1, p2), ref_count_(0) {
     58   }
     59 
     60   template<typename P1, typename P2, typename P3>
     61   RefCountedObject(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3), ref_count_(0) {
     62   }
     63 
     64   template<typename P1, typename P2, typename P3, typename P4>
     65   RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4)
     66       : T(p1, p2, p3, p4), ref_count_(0) {
     67   }
     68 
     69   template<typename P1, typename P2, typename P3, typename P4, typename P5>
     70   RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)
     71       : T(p1, p2, p3, p4, p5), ref_count_(0) {
     72   }
     73 
     74   virtual int AddRef() {
     75     return talk_base::AtomicOps::Increment(&ref_count_);
     76   }
     77 
     78   virtual int Release() {
     79     int count = talk_base::AtomicOps::Decrement(&ref_count_);
     80     if (!count) {
     81       delete this;
     82     }
     83     return count;
     84   }
     85 
     86  protected:
     87   virtual ~RefCountedObject() {
     88   }
     89 
     90   int ref_count_;
     91 };
     92 
     93 }  // namespace talk_base
     94 
     95 #endif  // TALK_APP_BASE_REFCOUNT_H_
     96