117 lines
3.5 KiB
C++
117 lines
3.5 KiB
C++
/*
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* Copyright (C) 2015 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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/FastMalloc.h>
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namespace WTF {
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// The purpose of this class is to ensure that the wrapped pointer will never be
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// used uninitialized.
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template <typename T> class NakedPtr {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ALWAYS_INLINE NakedPtr() : m_ptr(nullptr) { }
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ALWAYS_INLINE NakedPtr(T* ptr) : m_ptr(ptr) { }
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ALWAYS_INLINE NakedPtr(const NakedPtr& o) : m_ptr(o.m_ptr) { }
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template<typename U> NakedPtr(const NakedPtr<U>& o) : m_ptr(o.get()) { }
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ALWAYS_INLINE NakedPtr(NakedPtr&& o) : m_ptr(o.get()) { }
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template<typename U> NakedPtr(NakedPtr<U>&& o) : m_ptr(o.get()) { }
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T* get() const { return m_ptr; }
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void clear() { m_ptr = nullptr; }
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T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
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ALWAYS_INLINE T* operator->() const { return m_ptr; }
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operator T*() { return m_ptr; }
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bool operator!() const { return !m_ptr; }
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explicit operator bool() const { return !!m_ptr; }
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NakedPtr& operator=(const NakedPtr&);
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NakedPtr& operator=(T*);
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template<typename U> NakedPtr& operator=(const NakedPtr<U>&);
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NakedPtr& operator=(NakedPtr&&);
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template<typename U> NakedPtr& operator=(NakedPtr<U>&&);
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void swap(NakedPtr&);
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private:
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T* m_ptr;
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};
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template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(const NakedPtr& o)
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{
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m_ptr = o.m_ptr;
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return *this;
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}
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template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(T* optr)
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{
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m_ptr = optr;
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return *this;
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}
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template<typename T> template<typename U> inline NakedPtr<T>& NakedPtr<T>::operator=(const NakedPtr<U>& o)
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{
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NakedPtr ptr = o;
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swap(ptr);
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return *this;
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}
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template<typename T> inline NakedPtr<T>& NakedPtr<T>::operator=(NakedPtr&& o)
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{
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NakedPtr ptr = WTFMove(o);
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swap(ptr);
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return *this;
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}
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template<typename T> template<typename U> inline NakedPtr<T>& NakedPtr<T>::operator=(NakedPtr<U>&& o)
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{
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NakedPtr ptr = WTFMove(o);
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swap(ptr);
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return *this;
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}
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template<class T> inline void NakedPtr<T>::swap(NakedPtr& o)
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{
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std::swap(m_ptr, o.m_ptr);
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}
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template<class T> inline void swap(NakedPtr<T>& a, NakedPtr<T>& b)
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{
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a.swap(b);
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}
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} // namespace WTF
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using WTF::NakedPtr;
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