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