WebPrivateOwnPtr.h revision 65f03d4f644ce73618e5f4f50dd694b26f55ae12 
1/*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef WebPrivateOwnPtr_h
27#define WebPrivateOwnPtr_h
28
29#include "WebCommon.h"
30
31namespace WebKit {
32
33// This class is an implementation detail of the WebKit API.  It exists
34// to help simplify the implementation of WebKit interfaces that merely
35// wrap a pointer to a WebCore class. It's similar to WebPrivatePtr, but it
36// wraps a naked pointer rather than a reference counted.
37// Note: you must call reset(0) on the implementation side in order to delete
38// the WebCore pointer.
39template <typename T>
40class WebPrivateOwnPtr {
41public:
42    WebPrivateOwnPtr() : m_ptr(0) {}
43    ~WebPrivateOwnPtr() { WEBKIT_ASSERT(!m_ptr); }
44
45#if WEBKIT_IMPLEMENTATION
46    explicit WebPrivateOwnPtr(T* ptr)
47        : m_ptr(ptr)
48    {
49    }
50
51    void reset(T* ptr)
52    {
53        delete m_ptr;
54        m_ptr = ptr;
55    }
56
57    T* get() const { return m_ptr; }
58
59    T* operator->() const
60    {
61        WEBKIT_ASSERT(m_ptr);
62        return m_ptr;
63    }
64#endif // WEBKIT_IMPLEMENTATION
65
66private:
67    T* m_ptr;
68
69    WebPrivateOwnPtr(const WebPrivateOwnPtr&);
70    void operator=(const WebPrivateOwnPtr&);
71};
72
73} // namespace WebKit
74
75#endif
76