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/*
* Copyright (C) 2006, 2010 Apple Inc. 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_OwnArrayPtr_h
#define WTF_OwnArrayPtr_h
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
#include <wtf/NullPtr.h>
#include <wtf/PassOwnArrayPtr.h>
#include <algorithm>
namespace WTF {
template<typename T> class PassOwnArrayPtr;
template<typename T> PassOwnArrayPtr<T> adoptArrayPtr(T*);
template <typename T> class OwnArrayPtr {
public:
typedef T* PtrType;
OwnArrayPtr() : m_ptr(0) { }
// See comment in PassOwnArrayPtr.h for why this takes a const reference.
template<typename U> OwnArrayPtr(const PassOwnArrayPtr<U>& o);
// This copy constructor is used implicitly by gcc when it generates
// transients for assigning a PassOwnArrayPtr<T> object to a stack-allocated
// OwnArrayPtr<T> object. It should never be called explicitly and gcc
// should optimize away the constructor when generating code.
OwnArrayPtr(const OwnArrayPtr<T>&);
~OwnArrayPtr() { deleteOwnedArrayPtr(m_ptr); }
PtrType get() const { return m_ptr; }
void clear();
PassOwnArrayPtr<T> release();
PtrType leakPtr() WARN_UNUSED_RETURN;
T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
T& operator[](std::ptrdiff_t i) const { ASSERT(m_ptr); ASSERT(i >= 0); return m_ptr[i]; }
bool operator!() const { return !m_ptr; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef T* OwnArrayPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; }
OwnArrayPtr& operator=(const PassOwnArrayPtr<T>&);
OwnArrayPtr& operator=(std::nullptr_t) { clear(); return *this; }
template<typename U> OwnArrayPtr& operator=(const PassOwnArrayPtr<U>&);
void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); }
private:
PtrType m_ptr;
};
template<typename T> template<typename U> inline OwnArrayPtr<T>::OwnArrayPtr(const PassOwnArrayPtr<U>& o)
: m_ptr(o.leakPtr())
{
}
template<typename T> inline void OwnArrayPtr<T>::clear()
{
PtrType ptr = m_ptr;
m_ptr = 0;
deleteOwnedArrayPtr(ptr);
}
template<typename T> inline PassOwnArrayPtr<T> OwnArrayPtr<T>::release()
{
PtrType ptr = m_ptr;
m_ptr = 0;
return adoptArrayPtr(ptr);
}
template<typename T> inline typename OwnArrayPtr<T>::PtrType OwnArrayPtr<T>::leakPtr()
{
PtrType ptr = m_ptr;
m_ptr = 0;
return ptr;
}
template<typename T> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<T>& o)
{
PtrType ptr = m_ptr;
m_ptr = o.leakPtr();
ASSERT(!ptr || m_ptr != ptr);
deleteOwnedArrayPtr(ptr);
return *this;
}
template<typename T> template<typename U> inline OwnArrayPtr<T>& OwnArrayPtr<T>::operator=(const PassOwnArrayPtr<U>& o)
{
PtrType ptr = m_ptr;
m_ptr = o.leakPtr();
ASSERT(!ptr || m_ptr != ptr);
deleteOwnedArrayPtr(ptr);
return *this;
}
template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b)
{
a.swap(b);
}
template<typename T, typename U> inline bool operator==(const OwnArrayPtr<T>& a, U* b)
{
return a.get() == b;
}
template<typename T, typename U> inline bool operator==(T* a, const OwnArrayPtr<U>& b)
{
return a == b.get();
}
template<typename T, typename U> inline bool operator!=(const OwnArrayPtr<T>& a, U* b)
{
return a.get() != b;
}
template<typename T, typename U> inline bool operator!=(T* a, const OwnArrayPtr<U>& b)
{
return a != b.get();
}
template <typename T> inline T* getPtr(const OwnArrayPtr<T>& p)
{
return p.get();
}
} // namespace WTF
using WTF::OwnArrayPtr;
#endif // WTF_OwnArrayPtr_h
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