Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/refcount.h

@@ -0,0 +1,78 @@
+/*
+ *  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 TALK_APP_BASE_REFCOUNT_H_
+#define TALK_APP_BASE_REFCOUNT_H_
+
+#include <string.h>
+
+#include "webrtc/base/criticalsection.h"
+
+namespace rtc {
+
+// 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 rtc::AtomicOps::Increment(&ref_count_);
+  }
+
+  virtual int Release() {
+    int count = rtc::AtomicOps::Decrement(&ref_count_);
+    if (!count) {
+      delete this;
+    }
+    return count;
+  }
+
+ protected:
+  virtual ~RefCountedObject() {
+  }
+
+  int ref_count_;
+};
+
+}  // namespace rtc
+
+#endif  // TALK_APP_BASE_REFCOUNT_H_