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/*
* Copyright (C) 2006, 2007 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_OwnPtr_h
#define WTF_OwnPtr_h
#include <algorithm>
#include <memory>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
#if PLATFORM(WIN)
typedef struct HBITMAP__* HBITMAP;
typedef struct HBRUSH__* HBRUSH;
typedef struct HFONT__* HFONT;
typedef struct HPALETTE__* HPALETTE;
typedef struct HPEN__* HPEN;
typedef struct HRGN__* HRGN;
#endif
namespace WTF {
// Unlike most of our smart pointers, OwnPtr can take either the pointer type or the pointed-to type.
// FIXME: Share a single RemovePointer class template with RetainPtr.
template <typename T> struct OwnPtrRemovePointer { typedef T type; };
template <typename T> struct OwnPtrRemovePointer<T*> { typedef T type; };
template <typename T> inline void deleteOwnedPtr(T* ptr)
{
typedef char known[sizeof(T) ? 1 : -1];
if (sizeof(known))
delete ptr;
}
#if PLATFORM(WIN)
void deleteOwnedPtr(HBITMAP);
void deleteOwnedPtr(HBRUSH);
void deleteOwnedPtr(HFONT);
void deleteOwnedPtr(HPALETTE);
void deleteOwnedPtr(HPEN);
void deleteOwnedPtr(HRGN);
#endif
template <typename T> class OwnPtr : Noncopyable {
public:
typedef typename OwnPtrRemovePointer<T>::type ValueType;
typedef ValueType* PtrType;
explicit OwnPtr(PtrType ptr = 0) : m_ptr(ptr) { }
OwnPtr(std::auto_ptr<ValueType> autoPtr) : m_ptr(autoPtr.release()) { }
~OwnPtr() { deleteOwnedPtr(m_ptr); }
PtrType get() const { return m_ptr; }
PtrType release() { PtrType ptr = m_ptr; m_ptr = 0; return ptr; }
// FIXME: This should be renamed to adopt.
void set(PtrType ptr) { ASSERT(!ptr || m_ptr != ptr); deleteOwnedPtr(m_ptr); m_ptr = ptr; }
void adopt(std::auto_ptr<ValueType> autoPtr) { ASSERT(!autoPtr.get() || m_ptr != autoPtr.get()); deleteOwnedPtr(m_ptr); m_ptr = autoPtr.release(); }
void clear() { deleteOwnedPtr(m_ptr); m_ptr = 0; }
ValueType& operator*() const { ASSERT(m_ptr); return *m_ptr; }
PtrType operator->() const { ASSERT(m_ptr); return m_ptr; }
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; }
void swap(OwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
private:
PtrType m_ptr;
};
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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