mirror of
https://github.com/flutter/flutter.git
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229 lines
7.6 KiB
C++
229 lines
7.6 KiB
C++
/*
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* Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef SKY_ENGINE_WTF_OWNPTR_H_
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#define SKY_ENGINE_WTF_OWNPTR_H_
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#include <algorithm>
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#include "sky/engine/wtf/HashTableDeletedValueType.h"
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#include "sky/engine/wtf/Noncopyable.h"
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#include "sky/engine/wtf/NullPtr.h"
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#include "sky/engine/wtf/OwnPtrCommon.h"
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namespace WTF {
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template<typename T> class PassOwnPtr;
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template<typename T> class OwnPtr {
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// If rvalue references are not supported, the copy constructor is
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// public so OwnPtr cannot be marked noncopyable. See note below.
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WTF_MAKE_NONCOPYABLE(OwnPtr);
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WTF_DISALLOW_CONSTRUCTION_FROM_ZERO(OwnPtr);
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public:
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typedef typename RemoveExtent<T>::Type ValueType;
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typedef ValueType* PtrType;
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OwnPtr() : m_ptr(0) { }
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OwnPtr(std::nullptr_t) : m_ptr(0) { }
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// See comment in PassOwnPtr.h for why this takes a const reference.
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OwnPtr(const PassOwnPtr<T>&);
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template<typename U> OwnPtr(const PassOwnPtr<U>&, EnsurePtrConvertibleArgDecl(U, T));
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// Hash table deleted values, which are only constructed and never copied or destroyed.
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OwnPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
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bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
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~OwnPtr()
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{
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OwnedPtrDeleter<T>::deletePtr(m_ptr);
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m_ptr = 0;
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}
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PtrType get() const { return m_ptr; }
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void clear();
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PassOwnPtr<T> release();
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PtrType leakPtr() WARN_UNUSED_RETURN;
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ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; }
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PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
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ValueType& operator[](std::ptrdiff_t i) const;
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bool operator!() const { return !m_ptr; }
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// This conversion operator allows implicit conversion to bool but not to other integer types.
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typedef PtrType OwnPtr::*UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtr::m_ptr : 0; }
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OwnPtr& operator=(const PassOwnPtr<T>&);
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OwnPtr& operator=(std::nullptr_t) { clear(); return *this; }
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template<typename U> OwnPtr& operator=(const PassOwnPtr<U>&);
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OwnPtr(OwnPtr&&);
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template<typename U> OwnPtr(OwnPtr<U>&&);
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OwnPtr& operator=(OwnPtr&&);
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template<typename U> OwnPtr& operator=(OwnPtr<U>&&);
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void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
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static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
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private:
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// We should never have two OwnPtrs for the same underlying object (otherwise we'll get
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// double-destruction), so these equality operators should never be needed.
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template<typename U> bool operator==(const OwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
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template<typename U> bool operator!=(const OwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
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template<typename U> bool operator==(const PassOwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
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template<typename U> bool operator!=(const PassOwnPtr<U>&) const { COMPILE_ASSERT(!sizeof(U*), OwnPtrs_should_never_be_equal); return false; }
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PtrType m_ptr;
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};
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template<typename T> inline OwnPtr<T>::OwnPtr(const PassOwnPtr<T>& o)
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: m_ptr(o.leakPtr())
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{
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}
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template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(const PassOwnPtr<U>& o, EnsurePtrConvertibleArgDefn(U, T))
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: m_ptr(o.leakPtr())
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{
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COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
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}
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template<typename T> inline void OwnPtr<T>::clear()
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{
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PtrType ptr = m_ptr;
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m_ptr = 0;
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OwnedPtrDeleter<T>::deletePtr(ptr);
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}
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template<typename T> inline PassOwnPtr<T> OwnPtr<T>::release()
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{
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PtrType ptr = m_ptr;
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m_ptr = 0;
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return PassOwnPtr<T>(ptr);
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}
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template<typename T> inline typename OwnPtr<T>::PtrType OwnPtr<T>::leakPtr()
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{
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PtrType ptr = m_ptr;
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m_ptr = 0;
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return ptr;
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}
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template<typename T> inline typename OwnPtr<T>::ValueType& OwnPtr<T>::operator[](std::ptrdiff_t i) const
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{
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COMPILE_ASSERT(IsArray<T>::value, Elements_access_is_possible_for_arrays_only);
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ASSERT(m_ptr);
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ASSERT(i >= 0);
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return m_ptr[i];
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}
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template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<T>& o)
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{
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PtrType ptr = m_ptr;
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m_ptr = o.leakPtr();
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ASSERT(!ptr || m_ptr != ptr);
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OwnedPtrDeleter<T>::deletePtr(ptr);
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return *this;
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}
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template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(const PassOwnPtr<U>& o)
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{
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COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
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PtrType ptr = m_ptr;
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m_ptr = o.leakPtr();
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ASSERT(!ptr || m_ptr != ptr);
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OwnedPtrDeleter<T>::deletePtr(ptr);
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return *this;
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}
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template<typename T> inline OwnPtr<T>::OwnPtr(OwnPtr<T>&& o)
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: m_ptr(o.leakPtr())
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{
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}
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template<typename T> template<typename U> inline OwnPtr<T>::OwnPtr(OwnPtr<U>&& o)
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: m_ptr(o.leakPtr())
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{
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COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
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}
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template<typename T> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<T>&& o)
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{
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PtrType ptr = m_ptr;
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m_ptr = o.leakPtr();
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ASSERT(!ptr || m_ptr != ptr);
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OwnedPtrDeleter<T>::deletePtr(ptr);
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return *this;
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}
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template<typename T> template<typename U> inline OwnPtr<T>& OwnPtr<T>::operator=(OwnPtr<U>&& o)
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{
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COMPILE_ASSERT(!IsArray<T>::value, Pointers_to_array_must_never_be_converted);
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PtrType ptr = m_ptr;
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m_ptr = o.leakPtr();
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ASSERT(!ptr || m_ptr != ptr);
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OwnedPtrDeleter<T>::deletePtr(ptr);
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return *this;
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}
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template<typename T> inline void swap(OwnPtr<T>& a, OwnPtr<T>& b)
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{
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a.swap(b);
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}
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template<typename T, typename U> inline bool operator==(const OwnPtr<T>& a, U* b)
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{
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return a.get() == b;
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}
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template<typename T, typename U> inline bool operator==(T* a, const OwnPtr<U>& b)
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{
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return a == b.get();
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}
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template<typename T, typename U> inline bool operator!=(const OwnPtr<T>& a, U* b)
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{
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return a.get() != b;
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}
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template<typename T, typename U> inline bool operator!=(T* a, const OwnPtr<U>& b)
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{
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return a != b.get();
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}
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template<typename T> inline typename OwnPtr<T>::PtrType getPtr(const OwnPtr<T>& p)
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{
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return p.get();
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}
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} // namespace WTF
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using WTF::OwnPtr;
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#endif // SKY_ENGINE_WTF_OWNPTR_H_
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