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
37namespace 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.
45template <typename T>
46class WebPrivateOwnPtr : public WebNonCopyable {
47public:
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
86private:
87    T* m_ptr;
88};
89
90#if INSIDE_BLINK
91template<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