/* | |
* 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 |