107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <memory>
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#include <wtf/Assertions.h>
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namespace WTF {
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template<typename T> class UniqueRef;
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template<typename T, class... Args>
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UniqueRef<T> makeUniqueRefWithoutFastMallocCheck(Args&&... args)
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{
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return UniqueRef<T>(*new T(std::forward<Args>(args)...));
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}
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template<typename T, class... Args>
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UniqueRef<T> makeUniqueRef(Args&&... args)
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{
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static_assert(std::is_same<typename T::webkitFastMalloced, int>::value, "T is FastMalloced");
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return makeUniqueRefWithoutFastMallocCheck<T>(std::forward<Args>(args)...);
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}
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template<typename T>
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UniqueRef<T> makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<T>&& ptr)
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{
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return UniqueRef<T>(WTFMove(ptr));
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}
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template<typename T>
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class UniqueRef {
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public:
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template <typename U>
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UniqueRef(UniqueRef<U>&& other)
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: m_ref(other.m_ref.release())
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{
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ASSERT(m_ref);
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}
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explicit UniqueRef(T& other)
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: m_ref(&other)
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{
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ASSERT(m_ref);
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}
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T* ptr() RETURNS_NONNULL { ASSERT(m_ref); return m_ref.get(); }
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T* ptr() const RETURNS_NONNULL { ASSERT(m_ref); return m_ref.get(); }
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T& get() { ASSERT(m_ref); return *m_ref; }
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const T& get() const { ASSERT(m_ref); return *m_ref; }
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T* operator&() { ASSERT(m_ref); return m_ref.get(); }
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const T* operator&() const { ASSERT(m_ref); return m_ref.get(); }
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T* operator->() { ASSERT(m_ref); return m_ref.get(); }
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const T* operator->() const { ASSERT(m_ref); return m_ref.get(); }
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operator T&() { ASSERT(m_ref); return *m_ref; }
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operator const T&() const { ASSERT(m_ref); return *m_ref; }
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std::unique_ptr<T> moveToUniquePtr() { return WTFMove(m_ref); }
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private:
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template<class U, class... Args> friend UniqueRef<U> makeUniqueRefWithoutFastMallocCheck(Args&&...);
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template<class U> friend UniqueRef<U> makeUniqueRefFromNonNullUniquePtr(std::unique_ptr<U>&&);
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template<class U> friend class UniqueRef;
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explicit UniqueRef(std::unique_ptr<T>&& ptr)
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: m_ref(WTFMove(ptr))
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{
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ASSERT(m_ref);
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}
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std::unique_ptr<T> m_ref;
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};
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} // namespace WTF
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using WTF::UniqueRef;
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using WTF::makeUniqueRef;
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using WTF::makeUniqueRefWithoutFastMallocCheck;
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using WTF::makeUniqueRefFromNonNullUniquePtr;
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