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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
*
* 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 GOwnPtr_h
#define GOwnPtr_h
#include <algorithm>
#include <wtf/Assertions.h>
#include <wtf/Noncopyable.h>
// Forward delcarations at this point avoid the need to include GLib includes
// in WTF headers.
typedef struct _GError GError;
typedef struct _GList GList;
typedef struct _GCond GCond;
typedef struct _GMutex GMutex;
typedef struct _GPatternSpec GPatternSpec;
typedef struct _GDir GDir;
typedef struct _GHashTable GHashTable;
typedef struct _GFile GFile;
extern "C" void g_free(void*);
namespace WTF {
template <typename T> inline void freeOwnedGPtr(T* ptr);
template<> void freeOwnedGPtr<GError>(GError*);
template<> void freeOwnedGPtr<GList>(GList*);
template<> void freeOwnedGPtr<GCond>(GCond*);
template<> void freeOwnedGPtr<GMutex>(GMutex*);
template<> void freeOwnedGPtr<GPatternSpec>(GPatternSpec*);
template<> void freeOwnedGPtr<GDir>(GDir*);
template<> void freeOwnedGPtr<GHashTable>(GHashTable*);
template<> void freeOwnedGPtr<GFile>(GFile*);
template <typename T> class GOwnPtr : public Noncopyable {
public:
explicit GOwnPtr(T* ptr = 0) : m_ptr(ptr) { }
~GOwnPtr() { freeOwnedGPtr(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);
freeOwnedGPtr(m_ptr);
m_ptr = ptr;
}
void clear()
{
freeOwnedGPtr(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* GOwnPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &GOwnPtr::m_ptr : 0; }
void swap(GOwnPtr& o) { std::swap(m_ptr, o.m_ptr); }
private:
T* m_ptr;
};
template <typename T> inline void swap(GOwnPtr<T>& a, GOwnPtr<T>& b)
{
a.swap(b);
}
template <typename T, typename U> inline bool operator==(const GOwnPtr<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const GOwnPtr<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const GOwnPtr<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const GOwnPtr<U>& b)
{
return a != b.get();
}
template <typename T> inline typename GOwnPtr<T>::PtrType getPtr(const GOwnPtr<T>& p)
{
return p.get();
}
template <typename T> inline void freeOwnedGPtr(T* ptr)
{
g_free(ptr);
}
} // namespace WTF
using WTF::GOwnPtr;
#endif // GOwnPtr_h
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