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:
WebPrivateOwnPtr()48 WebPrivateOwnPtr() : m_ptr(0) {}
~WebPrivateOwnPtr()49 ~WebPrivateOwnPtr() { BLINK_ASSERT(!m_ptr); }
50
WebPrivateOwnPtr(T * ptr)51 explicit WebPrivateOwnPtr(T* ptr)
52 : m_ptr(ptr)
53 {
54 }
55
get()56 T* get() const { return m_ptr; }
57
58 #if INSIDE_BLINK
59 template<typename U> WebPrivateOwnPtr(const PassOwnPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
60
reset(T * ptr)61 void reset(T* ptr)
62 {
63 delete m_ptr;
64 m_ptr = ptr;
65 }
66
reset(const PassOwnPtr<T> & o)67 void reset(const PassOwnPtr<T>& o)
68 {
69 reset(o.leakPtr());
70 }
71
release()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
WebPrivateOwnPtr(const PassOwnPtr<U> & o,EnsurePtrConvertibleArgDefn (U,T))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