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