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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  * Copyright (C) 2013 Intel Corporation. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     22  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef WebPrivateOwnPtr_h
     28 #define WebPrivateOwnPtr_h
     29 
     30 #include "WebCommon.h"
     31 #include "WebNonCopyable.h"
     32 
     33 #if INSIDE_BLINK
     34 #include "wtf/PassOwnPtr.h"
     35 #endif
     36 
     37 namespace blink {
     38 
     39 // This class is an implementation detail of the WebKit API.  It exists
     40 // to help simplify the implementation of WebKit interfaces that merely
     41 // wrap a pointer to a WebCore class. It's similar to WebPrivatePtr, but it
     42 // wraps a naked pointer rather than a reference counted.
     43 // Note: you must call reset(0) on the implementation side in order to delete
     44 // the WebCore pointer.
     45 template <typename T>
     46 class WebPrivateOwnPtr : public WebNonCopyable {
     47 public:
     48     WebPrivateOwnPtr() : m_ptr(0) {}
     49     ~WebPrivateOwnPtr() { BLINK_ASSERT(!m_ptr); }
     50 
     51     explicit WebPrivateOwnPtr(T* ptr)
     52         : m_ptr(ptr)
     53     {
     54     }
     55 
     56     T* get() const { return m_ptr; }
     57 
     58 #if INSIDE_BLINK
     59     template<typename U> WebPrivateOwnPtr(const PassOwnPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
     60 
     61     void reset(T* ptr)
     62     {
     63         delete m_ptr;
     64         m_ptr = ptr;
     65     }
     66 
     67     void reset(const PassOwnPtr<T>& o)
     68     {
     69         reset(o.leakPtr());
     70     }
     71 
     72     PassOwnPtr<T> release()
     73     {
     74         T* ptr = m_ptr;
     75         m_ptr = 0;
     76         return adoptPtr(ptr);
     77     }
     78 
     79     T* operator->() const
     80     {
     81         BLINK_ASSERT(m_ptr);
     82         return m_ptr;
     83     }
     84 #endif // INSIDE_BLINK
     85 
     86 private:
     87     T* m_ptr;
     88 };
     89 
     90 #if INSIDE_BLINK
     91 template<typename T> template<typename U> inline WebPrivateOwnPtr<T>::WebPrivateOwnPtr(const PassOwnPtr<U>& o, EnsurePtrConvertibleArgDefn(U, T))
     92     : m_ptr(o.leakPtr())
     93 {
     94     COMPILE_ASSERT(!WTF::IsArray<T>::value, Pointers_to_array_must_never_be_converted);
     95 }
     96 #endif
     97 
     98 } // namespace blink
     99 
    100 #endif
    101