1/* 2 * Copyright (C) 2013 Apple 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 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef MallocPtr_h 27#define MallocPtr_h 28 29// MallocPtr is a smart pointer class that calls fastFree in its destructor. 30// It is intended to be used for pointers where the C++ lifetime semantics 31// (calling constructors and destructors) is not desired. 32 33namespace WTF { 34 35template<typename T> class MallocPtr { 36public: 37 MallocPtr() 38 : m_ptr(nullptr) 39 { 40 } 41 42 MallocPtr(std::nullptr_t) 43 : m_ptr(nullptr) 44 { 45 } 46 47 MallocPtr(MallocPtr&& other) 48 : m_ptr(other.leakPtr()) 49 { 50 } 51 52 ~MallocPtr() 53 { 54 fastFree(m_ptr); 55 } 56 57 T* get() const 58 { 59 return m_ptr; 60 } 61 62 T *leakPtr() WARN_UNUSED_RETURN 63 { 64 T* ptr = m_ptr; 65 m_ptr = nullptr; 66 return ptr; 67 } 68 69 bool operator!() const 70 { 71 return !m_ptr; 72 } 73 74 MallocPtr& operator=(MallocPtr&& other) 75 { 76 MallocPtr ptr = WTF::move(other); 77 swap(ptr); 78 79 return *this; 80 } 81 82 void swap(MallocPtr& other) 83 { 84 std::swap(m_ptr, other.m_ptr); 85 } 86 87 template<typename U> friend MallocPtr<U> adoptMallocPtr(U*); 88 89 static MallocPtr malloc(size_t size) 90 { 91 MallocPtr mallocPtr; 92 mallocPtr.m_ptr = static_cast<T*>(fastMalloc(size)); 93 94 return mallocPtr; 95 } 96 97 void realloc(size_t newSize) 98 { 99 m_ptr = static_cast<T*>(fastRealloc(m_ptr, newSize)); 100 } 101 102private: 103 explicit MallocPtr(T* ptr) 104 : m_ptr(ptr) 105 { 106 } 107 108 T* m_ptr; 109}; 110 111template<typename U> MallocPtr<U> adoptMallocPtr(U* ptr) 112{ 113 return MallocPtr<U>(ptr); 114} 115 116} // namespace WTF 117 118using WTF::MallocPtr; 119using WTF::adoptMallocPtr; 120 121#endif // MallocPtr_h 122