Reland of Delete rtc::linked_ptr. Only use, in statstypes.h, replaced bu std::unique_ptr.

webrtc/base/linked_ptr.h

Index: webrtc/base/linked_ptr.h
diff --git a/webrtc/base/linked_ptr.h b/webrtc/base/linked_ptr.h
deleted file mode 100644
index 65e5a00ecfa75fec7389445122c0fd17f0c64dc5..0000000000000000000000000000000000000000
--- a/webrtc/base/linked_ptr.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- *  Copyright 2004 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.
- */
-
-/*
- * linked_ptr - simple reference linked pointer
- * (like reference counting, just using a linked list of the references
- * instead of their count.)
- *
- * The implementation stores three pointers for every linked_ptr, but
- * does not allocate anything on the free store.
- */
-
-#ifndef WEBRTC_BASE_LINKED_PTR_H__
-#define WEBRTC_BASE_LINKED_PTR_H__
-
-namespace rtc {
-
-/* For ANSI-challenged compilers, you may want to #define
- * NO_MEMBER_TEMPLATES, explicit or mutable */
-#define NO_MEMBER_TEMPLATES
-
-template <class X> class linked_ptr
-{
-public:
-
-#ifndef NO_MEMBER_TEMPLATES
-#   define TEMPLATE_FUNCTION template <class Y>
-    TEMPLATE_FUNCTION friend class linked_ptr<Y>;
-#else
-#   define TEMPLATE_FUNCTION
-    typedef X Y;
-#endif
-
-    typedef X element_type;
-
-    explicit linked_ptr(X* p = 0) throw()
-        : itsPtr(p) {itsPrev = itsNext = this;}
-    ~linked_ptr()
-        {release();}
-    linked_ptr(const linked_ptr& r) throw()
-        {acquire(r);}
-    linked_ptr& operator=(const linked_ptr& r)
-    {
-        if (this != &r) {
-            release();
-            acquire(r);
-        }
-        return *this;
-    }
-
-#ifndef NO_MEMBER_TEMPLATES
-    template <class Y> friend class linked_ptr<Y>;
-    template <class Y> linked_ptr(const linked_ptr<Y>& r) throw()
-        {acquire(r);}
-    template <class Y> linked_ptr& operator=(const linked_ptr<Y>& r)
-    {
-        if (this != &r) {
-            release();
-            acquire(r);
-        }
-        return *this;
-    }
-#endif // NO_MEMBER_TEMPLATES
-
-    X& operator*()  const throw()   {return *itsPtr;}
-    X* operator->() const throw()   {return itsPtr;}
-    X* get()        const throw()   {return itsPtr;}
-    bool unique()   const throw()   {return itsPrev ? itsPrev==this : true;}
-
-private:
-    X*                          itsPtr;
-    mutable const linked_ptr*   itsPrev;
-    mutable const linked_ptr*   itsNext;
-
-    void acquire(const linked_ptr& r) throw()
-    { // insert this to the list
-        itsPtr = r.itsPtr;
-        itsNext = r.itsNext;
-        itsNext->itsPrev = this;
-        itsPrev = &r;
-#ifndef mutable
-        r.itsNext = this;
-#else // for ANSI-challenged compilers
-        (const_cast<linked_ptr<X>*>(&r))->itsNext = this;
-#endif
-    }
-
-#ifndef NO_MEMBER_TEMPLATES
-    template <class Y> void acquire(const linked_ptr<Y>& r) throw()
-    { // insert this to the list
-        itsPtr = r.itsPtr;
-        itsNext = r.itsNext;
-        itsNext->itsPrev = this;
-        itsPrev = &r;
-#ifndef mutable
-        r.itsNext = this;
-#else // for ANSI-challenged compilers
-        (const_cast<linked_ptr<X>*>(&r))->itsNext = this;
-#endif
-    }
-#endif // NO_MEMBER_TEMPLATES
-
-    void release()
-    { // erase this from the list, delete if unique
-        if (unique()) delete itsPtr;
-        else {
-            itsPrev->itsNext = itsNext;
-            itsNext->itsPrev = itsPrev;
-            itsPrev = itsNext = 0;
-        }
-        itsPtr = 0;
-    }
-};
-
-} // namespace rtc
-
-#endif // WEBRTC_BASE_LINKED_PTR_H__
-