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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
* Copyright (C) 2010 Company 100, Inc.
*
* 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 OwnPtrBrew_h
#define OwnPtrBrew_h
#include <algorithm>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
// Forward delcarations at this point avoid the need to include BREW includes
// in WTF headers.
typedef struct _IFileMgr IFileMgr;
typedef struct _IFile IFile;
typedef struct IBitmap IBitmap;
namespace WTF {
template <typename T> void freeOwnedPtrBrew(T* ptr);
template<> void freeOwnedPtrBrew<IFileMgr>(IFileMgr*);
template<> void freeOwnedPtrBrew<IFile>(IFile*);
template<> void freeOwnedPtrBrew<IBitmap>(IBitmap*);
template <typename T> class OwnPtrBrew : public Noncopyable {
public:
explicit OwnPtrBrew(T* ptr = 0) : m_ptr(ptr) { }
~OwnPtrBrew() { freeOwnedPtrBrew(m_ptr); }
T* get() const { return m_ptr; }
T* release()
{
T* ptr = m_ptr;
m_ptr = 0;
return ptr;
}
T*& outPtr()
{
ASSERT(!m_ptr);
return m_ptr;
}
void set(T* ptr)
{
ASSERT(!ptr || m_ptr != ptr);
freeOwnedPtrBrew(m_ptr);
m_ptr = ptr;
}
void clear()
{
freeOwnedPtrBrew(m_ptr);
m_ptr = 0;
}
T& operator*() const
{
ASSERT(m_ptr);
return *m_ptr;
}
T* 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 T* OwnPtrBrew::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &OwnPtrBrew::m_ptr : 0; }
void swap(OwnPtrBrew& o) { std::swap(m_ptr, o.m_ptr); }
private:
T* m_ptr;
};
template <typename T> inline void swap(OwnPtrBrew<T>& a, OwnPtrBrew<T>& b)
{
a.swap(b);
}
template <typename T, typename U> inline bool operator==(const OwnPtrBrew<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const OwnPtrBrew<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const OwnPtrBrew<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const OwnPtrBrew<U>& b)
{
return a != b.get();
}
template <typename T> inline typename OwnPtrBrew<T>::PtrType getPtr(const OwnPtrBrew<T>& p)
{
return p.get();
}
} // namespace WTF
using WTF::OwnPtrBrew;
#endif // OwnPtrBrew_h
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