Add r-value constructor for RefCountedObject.

webrtc/base/refcount.h

 /*
  *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_BASE_REFCOUNT_H_
 #define WEBRTC_BASE_REFCOUNT_H_
 
 #include <string.h>
+#include <utility>
 
 #include "webrtc/base/atomicops.h"
 
 namespace rtc {
 
 // Reference count interface.
 class RefCountInterface {
  public:
   virtual int AddRef() const = 0;
   virtual int Release() const = 0;
+
  protected:
   virtual ~RefCountInterface() {}
 };
 
 template <class T>
 class RefCountedObject : public T {
  public:
-  RefCountedObject() : ref_count_(0) {
-  }
+  RefCountedObject() {}
 
-  template<typename P>
-  explicit RefCountedObject(P p) : T(p), ref_count_(0) {
-  }
+  template <typename P>
+  explicit RefCountedObject(const P& p) : T(p) {}
 
-  template<typename P1, typename P2>
-  RefCountedObject(P1 p1, P2 p2) : T(p1, p2), ref_count_(0) {
-  }
+  template <typename P>
+  explicit RefCountedObject(P&& p) : T(std::move(p)) {}
 
-  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>
+  RefCountedObject(P1 p1, P2 p2) : T(p1, p2) {}
 
-  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>
+  RefCountedObject(P1 p1, P2 p2, P3 p3) : T(p1, p2, p3) {}
 
-  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) {
-  }
+  template <typename P1, typename P2, typename P3, typename P4>
+  RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4) : T(p1, p2, p3, p4) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6>
+  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) {}
+
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6>
   RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6)
-      : T(p1, p2, p3, p4, p5, p6), ref_count_(0) {
-  }
+      : T(p1, p2, p3, p4, p5, p6) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6, typename P7>
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6,
+            typename P7>
   RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7)
-      : T(p1, p2, p3, p4, p5, p6, p7), ref_count_(0) {
-  }
+      : T(p1, p2, p3, p4, p5, p6, p7) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6, typename P7, typename P8>
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6,
+            typename P7,
+            typename P8>
   RefCountedObject(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8)
-      : T(p1, p2, p3, p4, p5, p6, p7, p8), ref_count_(0) {
-  }
+      : T(p1, p2, p3, p4, p5, p6, p7, p8) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6, typename P7, typename P8, typename P9>
-  RefCountedObject(
-      P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8, P9 p9)
-  : T(p1, p2, p3, p4, p5, p6, p7, p8, p9), ref_count_(0) {
-  }
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6,
+            typename P7,
+            typename P8,
+            typename P9>
+  RefCountedObject(P1 p1,
+                   P2 p2,
+                   P3 p3,
+                   P4 p4,
+                   P5 p5,
+                   P6 p6,
+                   P7 p7,
+                   P8 p8,
+                   P9 p9)
+      : T(p1, p2, p3, p4, p5, p6, p7, p8, p9) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6, typename P7, typename P8, typename P9, typename P10>
-  RefCountedObject(
-      P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8, P9 p9, P10 p10)
-  : T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10), ref_count_(0) {
-  }
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6,
+            typename P7,
+            typename P8,
+            typename P9,
+            typename P10>
+  RefCountedObject(P1 p1,
+                   P2 p2,
+                   P3 p3,
+                   P4 p4,
+                   P5 p5,
+                   P6 p6,
+                   P7 p7,
+                   P8 p8,
+                   P9 p9,
+                   P10 p10)
+      : T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10) {}
 
-  template<typename P1, typename P2, typename P3, typename P4, typename P5,
-           typename P6, typename P7, typename P8, typename P9, typename P10,
-           typename P11>
-  RefCountedObject(
-      P1 p1, P2 p2, P3 p3, P4 p4, P5 p5, P6 p6, P7 p7, P8 p8, P9 p9, P10 p10,
-      P11 p11)
-  : T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11), ref_count_(0) {
-  }
+  template <typename P1,
+            typename P2,
+            typename P3,
+            typename P4,
+            typename P5,
+            typename P6,
+            typename P7,
+            typename P8,
+            typename P9,
+            typename P10,
+            typename P11>
+  RefCountedObject(P1 p1,
+                   P2 p2,
+                   P3 p3,
+                   P4 p4,
+                   P5 p5,
+                   P6 p6,
+                   P7 p7,
+                   P8 p8,
+                   P9 p9,
+                   P10 p10,
+                   P11 p11)
+      : T(p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11) {}
 
-  virtual int AddRef() const {
-    return AtomicOps::Increment(&ref_count_);
-  }
+  virtual int AddRef() const { return AtomicOps::Increment(&ref_count_); }
 
   virtual int Release() const {
     int count = AtomicOps::Decrement(&ref_count_);
     if (!count) {
       delete this;
     }
     return count;
   }
 
   // Return whether the reference count is one. If the reference count is used
   // in the conventional way, a reference count of 1 implies that the current
   // thread owns the reference and no other thread shares it. This call
   // performs the test for a reference count of one, and performs the memory
   // barrier needed for the owning thread to act on the object, knowing that it
   // has exclusive access to the object.
   virtual bool HasOneRef() const {
     return AtomicOps::AcquireLoad(&ref_count_) == 1;
   }
 
  protected:
-  virtual ~RefCountedObject() {
-  }
+  virtual ~RefCountedObject() {}
 
-  mutable volatile int ref_count_;
+  mutable volatile int ref_count_ = 0;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_REFCOUNT_H_