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Guenter Obiltschnig
2006-10-23 15:48:43 +00:00
parent 727688af3e
commit 84fedbdb60
784 changed files with 133464 additions and 133464 deletions
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Foundation/include/Poco/SharedPtr.h
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@@ -1,370 +1,370 @@
//
// SharedPtr.h
//
// $Id: //poco/1.2/Foundation/include/Poco/SharedPtr.h#5 $
//
// Library: Foundation
// Package: Core
// Module: SharedPtr
//
// Definition of the SharedPtr template class.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_SharedPtr_INCLUDED
#define Foundation_SharedPtr_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include "Poco/Mutex.h"
#include <algorithm>
namespace Poco {
class ReferenceCounter
/// Simple ReferenceCounter object, does not delete itself when count reaches 0
{
public:
ReferenceCounter(): _cnt(1)
{
}
void duplicate()
{
FastMutex::ScopedLock lock(_mutex);
++_cnt;
}
int release()
{
FastMutex::ScopedLock lock(_mutex);
return --_cnt;
}
private:
FastMutex _mutex;
int _cnt;
};
template <class C>
class SharedPtr
/// SharedPtr is a "smart" pointer for classes implementing
/// reference counting based garbage collection.
/// SharedPtr is thus similar to AutoPtr. Unlike the
/// AutoPtr template, which can only be used with
/// classes that support reference counting, SharedPtr
/// can be used with any class. For this to work, a
/// SharedPtr manages a reference count for the object
/// it manages.
///
/// SharedPtr works in the following way:
/// If an SharedPtr is assigned an ordinary pointer to
/// an object (via the constructor or the assignment operator),
/// it takes ownership of the object and the object's reference
/// count is initialized to one.
/// If the SharedPtr is assigned another SharedPtr, the
/// object's reference count is incremented by one.
/// The destructor of SharedPtr decrements the object's
/// reference count by one and deletes the object if the
/// reference count reaches zero.
/// SharedPtr supports dereferencing with both the ->
/// and the * operator. An attempt to dereference a null
/// SharedPtr results in a NullPointerException being thrown.
/// SharedPtr also implements all relational operators and
/// a cast operator in case dynamic casting of the encapsulated data types
/// is required.
{
public:
SharedPtr(): _pCounter(new ReferenceCounter), _ptr(0)
{
}
SharedPtr(C* ptr): _pCounter(new ReferenceCounter), _ptr(ptr)
{
}
template <class Other>
SharedPtr(const SharedPtr<Other>& ptr): _pCounter(ptr._pCounter), _ptr(const_cast<Other*>(ptr.get()))
{
_pCounter->duplicate();
}
SharedPtr(const SharedPtr& ptr): _pCounter(ptr._pCounter), _ptr(ptr._ptr)
{
_pCounter->duplicate();
}
~SharedPtr()
{
release();
}
SharedPtr& operator = (C* ptr)
{
if (get() != ptr)
{
ReferenceCounter* pTmp = new ReferenceCounter;
release();
_pCounter = pTmp;
_ptr = ptr;
}
return *this;
}
SharedPtr& operator = (const SharedPtr& ptr)
{
if (&ptr != this)
{
SharedPtr tmp(ptr);
swap(tmp);
}
return *this;
}
template <class Other>
SharedPtr& operator = (const SharedPtr<Other>& ptr)
{
if (ptr.get() != _ptr)
{
SharedPtr tmp(ptr);
swap(tmp);
}
return *this;
}
template <class Other>
SharedPtr<Other> cast()
/// Casts the SharedPtr via a dynamic cast to the given type.
/// Returns an SharedPtr containing NULL if the cast fails.
/// Example: (assume class Sub: public Super)
/// SharedPtr<Super> super(new Sub());
/// SharedPtr<Sub> sub = super.cast<Sub>();
/// poco_assert (sub.get());
{
Other* pOther = dynamic_cast <Other*>(_ptr);
if (pOther)
return SharedPtr<Other> (_pCounter, pOther);
return SharedPtr<Other>();
}
void swap(SharedPtr& ptr)
{
std::swap(_ptr, ptr._ptr);
std::swap(_pCounter, ptr._pCounter);
}
C* operator -> ()
{
return deref();
}
const C* operator -> () const
{
return deref();
}
C& operator * ()
{
return *deref();
}
const C& operator * () const
{
return *deref();
}
C* get()
{
return _ptr;
}
bool isNull() const
{
return _ptr == 0;
}
operator C* ()
{
return _ptr;
}
operator const C* () const
{
return _ptr;
}
const C* get() const
{
return _ptr;
}
bool operator == (const SharedPtr& ptr) const
{
return get() == ptr.get();
}
bool operator == (const C* ptr) const
{
return get() == ptr;
}
bool operator == (C* ptr) const
{
return get() == ptr;
}
bool operator != (const SharedPtr& ptr) const
{
return get() != ptr.get();
}
bool operator != (const C* ptr) const
{
return get() != ptr;
}
bool operator != (C* ptr) const
{
return get() != ptr;
}
bool operator < (const SharedPtr& ptr) const
{
return get() < ptr.get();
}
bool operator < (const C* ptr) const
{
return get() < ptr;
}
bool operator < (C* ptr) const
{
return get() < ptr;
}
bool operator <= (const SharedPtr& ptr) const
{
return get() <= ptr.get();
}
bool operator <= (const C* ptr) const
{
return get() <= ptr;
}
bool operator <= (C* ptr) const
{
return get() <= ptr;
}
bool operator > (const SharedPtr& ptr) const
{
return get() > ptr.get();
}
bool operator > (const C* ptr) const
{
return get() > ptr;
}
bool operator > (C* ptr) const
{
return get() > ptr;
}
bool operator >= (const SharedPtr& ptr) const
{
return get() >= ptr.get();
}
bool operator >= (const C* ptr) const
{
return get() >= ptr;
}
bool operator >= (C* ptr) const
{
return get() >= ptr;
}
private:
C* deref() const
{
if (!_ptr)
throw NullPointerException();
return _ptr;
}
void release()
{
poco_assert_dbg (_pCounter);
int i = _pCounter->release();
if (i == 0)
{
if (_ptr)
delete _ptr;
_ptr = 0;
delete _pCounter;
_pCounter = 0;
}
}
SharedPtr(ReferenceCounter* pCounter, C* ptr): _pCounter(pCounter), _ptr(ptr)
/// for cast operation
{
poco_assert_dbg (_pCounter);
_pCounter->duplicate();
}
private:
ReferenceCounter* _pCounter;
C* _ptr;
template<class Other> friend class SharedPtr;
};
template <class C>
inline void swap(SharedPtr<C>& p1, SharedPtr<C>& p2)
{
p1.swap(p2);
}
} // namespace Poco
#endif // Foundation_SharedPtr_INCLUDED
//
// SharedPtr.h
//
// $Id: //poco/1.2/Foundation/include/Poco/SharedPtr.h#5 $
//
// Library: Foundation
// Package: Core
// Module: SharedPtr
//
// Definition of the SharedPtr template class.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_SharedPtr_INCLUDED
#define Foundation_SharedPtr_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Exception.h"
#include "Poco/Mutex.h"
#include <algorithm>
namespace Poco {
class ReferenceCounter
/// Simple ReferenceCounter object, does not delete itself when count reaches 0
{
public:
ReferenceCounter(): _cnt(1)
{
}
void duplicate()
{
FastMutex::ScopedLock lock(_mutex);
++_cnt;
}
int release()
{
FastMutex::ScopedLock lock(_mutex);
return --_cnt;
}
private:
FastMutex _mutex;
int _cnt;
};
template <class C>
class SharedPtr
/// SharedPtr is a "smart" pointer for classes implementing
/// reference counting based garbage collection.
/// SharedPtr is thus similar to AutoPtr. Unlike the
/// AutoPtr template, which can only be used with
/// classes that support reference counting, SharedPtr
/// can be used with any class. For this to work, a
/// SharedPtr manages a reference count for the object
/// it manages.
///
/// SharedPtr works in the following way:
/// If an SharedPtr is assigned an ordinary pointer to
/// an object (via the constructor or the assignment operator),
/// it takes ownership of the object and the object's reference
/// count is initialized to one.
/// If the SharedPtr is assigned another SharedPtr, the
/// object's reference count is incremented by one.
/// The destructor of SharedPtr decrements the object's
/// reference count by one and deletes the object if the
/// reference count reaches zero.
/// SharedPtr supports dereferencing with both the ->
/// and the * operator. An attempt to dereference a null
/// SharedPtr results in a NullPointerException being thrown.
/// SharedPtr also implements all relational operators and
/// a cast operator in case dynamic casting of the encapsulated data types
/// is required.
{
public:
SharedPtr(): _pCounter(new ReferenceCounter), _ptr(0)
{
}
SharedPtr(C* ptr): _pCounter(new ReferenceCounter), _ptr(ptr)
{
}
template <class Other>
SharedPtr(const SharedPtr<Other>& ptr): _pCounter(ptr._pCounter), _ptr(const_cast<Other*>(ptr.get()))
{
_pCounter->duplicate();
}
SharedPtr(const SharedPtr& ptr): _pCounter(ptr._pCounter), _ptr(ptr._ptr)
{
_pCounter->duplicate();
}
~SharedPtr()
{
release();
}
SharedPtr& operator = (C* ptr)
{
if (get() != ptr)
{
ReferenceCounter* pTmp = new ReferenceCounter;
release();
_pCounter = pTmp;
_ptr = ptr;
}
return *this;
}
SharedPtr& operator = (const SharedPtr& ptr)
{
if (&ptr != this)
{
SharedPtr tmp(ptr);
swap(tmp);
}
return *this;
}
template <class Other>
SharedPtr& operator = (const SharedPtr<Other>& ptr)
{
if (ptr.get() != _ptr)
{
SharedPtr tmp(ptr);
swap(tmp);
}
return *this;
}
template <class Other>
SharedPtr<Other> cast()
/// Casts the SharedPtr via a dynamic cast to the given type.
/// Returns an SharedPtr containing NULL if the cast fails.
/// Example: (assume class Sub: public Super)
/// SharedPtr<Super> super(new Sub());
/// SharedPtr<Sub> sub = super.cast<Sub>();
/// poco_assert (sub.get());
{
Other* pOther = dynamic_cast <Other*>(_ptr);
if (pOther)
return SharedPtr<Other> (_pCounter, pOther);
return SharedPtr<Other>();
}
void swap(SharedPtr& ptr)
{
std::swap(_ptr, ptr._ptr);
std::swap(_pCounter, ptr._pCounter);
}
C* operator -> ()
{
return deref();
}
const C* operator -> () const
{
return deref();
}
C& operator * ()
{
return *deref();
}
const C& operator * () const
{
return *deref();
}
C* get()
{
return _ptr;
}
bool isNull() const
{
return _ptr == 0;
}
operator C* ()
{
return _ptr;
}
operator const C* () const
{
return _ptr;
}
const C* get() const
{
return _ptr;
}
bool operator == (const SharedPtr& ptr) const
{
return get() == ptr.get();
}
bool operator == (const C* ptr) const
{
return get() == ptr;
}
bool operator == (C* ptr) const
{
return get() == ptr;
}
bool operator != (const SharedPtr& ptr) const
{
return get() != ptr.get();
}
bool operator != (const C* ptr) const
{
return get() != ptr;
}
bool operator != (C* ptr) const
{
return get() != ptr;
}
bool operator < (const SharedPtr& ptr) const
{
return get() < ptr.get();
}
bool operator < (const C* ptr) const
{
return get() < ptr;
}
bool operator < (C* ptr) const
{
return get() < ptr;
}
bool operator <= (const SharedPtr& ptr) const
{
return get() <= ptr.get();
}
bool operator <= (const C* ptr) const
{
return get() <= ptr;
}
bool operator <= (C* ptr) const
{
return get() <= ptr;
}
bool operator > (const SharedPtr& ptr) const
{
return get() > ptr.get();
}
bool operator > (const C* ptr) const
{
return get() > ptr;
}
bool operator > (C* ptr) const
{
return get() > ptr;
}
bool operator >= (const SharedPtr& ptr) const
{
return get() >= ptr.get();
}
bool operator >= (const C* ptr) const
{
return get() >= ptr;
}
bool operator >= (C* ptr) const
{
return get() >= ptr;
}
private:
C* deref() const
{
if (!_ptr)
throw NullPointerException();
return _ptr;
}
void release()
{
poco_assert_dbg (_pCounter);
int i = _pCounter->release();
if (i == 0)
{
if (_ptr)
delete _ptr;
_ptr = 0;
delete _pCounter;
_pCounter = 0;
}
}
SharedPtr(ReferenceCounter* pCounter, C* ptr): _pCounter(pCounter), _ptr(ptr)
/// for cast operation
{
poco_assert_dbg (_pCounter);
_pCounter->duplicate();
}
private:
ReferenceCounter* _pCounter;
C* _ptr;
template<class Other> friend class SharedPtr;
};
template <class C>
inline void swap(SharedPtr<C>& p1, SharedPtr<C>& p2)
{
p1.swap(p2);
}
} // namespace Poco
#endif // Foundation_SharedPtr_INCLUDED