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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 <algorithm>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
namespace WTF {
template <typename T> class OwnArrayPtr : public Noncopyable {
public:
explicit OwnArrayPtr(T* ptr = 0) : m_ptr(ptr) { }
~OwnArrayPtr() { safeDelete(m_ptr); }
T* get() const { return m_ptr; }
T* release() { T* ptr = m_ptr; m_ptr = 0; return ptr; }
// FIXME: This should be removed and replaced with PassOwnArrayPtr.
void set(T* ptr)
{
ASSERT(!ptr || m_ptr != ptr);
T* oldPtr = m_ptr;
m_ptr = ptr;
safeDelete(oldPtr);
}
void clear();
T& operator*() const { ASSERT(m_ptr); return *m_ptr; }
T* 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.
#if COMPILER(WINSCW)
operator bool() const { return m_ptr; }
#else
typedef T* OwnArrayPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &OwnArrayPtr::m_ptr : 0; }
#endif
void swap(OwnArrayPtr& o) { std::swap(m_ptr, o.m_ptr); }
private:
static void safeDelete(T*);
T* m_ptr;
};
template<typename T> inline void OwnArrayPtr<T>::clear()
{
T* ptr = m_ptr;
m_ptr = 0;
safeDelete(ptr);
}
template<typename T> inline void OwnArrayPtr<T>::safeDelete(T* ptr)
{
typedef char known[sizeof(T) ? 1 : -1];
if (sizeof(known))
delete [] ptr;
}
template <typename T> inline void swap(OwnArrayPtr<T>& a, OwnArrayPtr<T>& b) { a.swap(b); }
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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