intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 448 insertions, 0 deletions

diff --git a/contrib/libs/poco/Foundation/include/Poco/SharedPtr.h b/contrib/libs/poco/Foundation/include/Poco/SharedPtr.h
new file mode 100644
index 0000000000..899d448839
--- /dev/null
+++ b/contrib/libs/poco/Foundation/include/Poco/SharedPtr.h
@@ -0,0 +1,448 @@
+//
+// SharedPtr.h
+//
+// Library: Foundation
+// Package: Core
+// Module:  SharedPtr
+//
+// Definition of the SharedPtr template class.
+//
+// Copyright (c) 2005-2008, Applied Informatics Software Engineering GmbH.
+// and Contributors.
+//
+// SPDX-License-Identifier:	BSL-1.0
+//
+
+
+#ifndef Foundation_SharedPtr_INCLUDED
+#define Foundation_SharedPtr_INCLUDED
+
+
+#include "Poco/Foundation.h"
+#include "Poco/Exception.h"
+#include "Poco/AtomicCounter.h"
+#include <algorithm>
+
+
+namespace Poco {
+
+
+class ReferenceCounter
+	/// Simple ReferenceCounter object, does not delete itself when count reaches 0.
+{
+public:
+	ReferenceCounter(): _cnt(1)
+	{
+	}
+
+	void duplicate()
+	{
+		++_cnt;
+	}
+
+	int release()
+	{
+		return --_cnt;
+	}
+	
+	int referenceCount() const
+	{
+		return _cnt.value();
+	}
+
+private:
+	AtomicCounter _cnt;
+};
+
+
+template <class C>
+class ReleasePolicy
+	/// The default release policy for SharedPtr, which
+	/// simply uses the delete operator to delete an object.
+{
+public:
+	static void release(C* pObj)
+		/// Delete the object.
+		/// Note that pObj can be 0.
+	{
+		delete pObj;
+	}
+};
+
+
+template <class C>
+class ReleaseArrayPolicy
+	/// The release policy for SharedPtr holding arrays.
+{
+public:
+	static void release(C* pObj)
+		/// Delete the object.
+		/// Note that pObj can be 0.
+	{
+		delete [] pObj;
+	}
+};
+
+
+template <class C, class RC = ReferenceCounter, class RP = ReleasePolicy<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 RC), _ptr(0)
+	{
+	}
+
+	SharedPtr(C* ptr)
+	try:
+		_pCounter(new RC), 
+		_ptr(ptr)
+	{
+	}
+	catch (...) 
+	{
+		RP::release(ptr);
+	}
+
+	template <class Other, class OtherRP> 
+	SharedPtr(const SharedPtr<Other, RC, OtherRP>& 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()
+	{
+		try
+		{
+			release();
+		}
+		catch (...)
+		{
+			poco_unexpected();
+		}
+	}
+
+	SharedPtr& assign(C* ptr)
+	{
+		if (get() != ptr)
+		{
+			SharedPtr tmp(ptr);
+			swap(tmp);
+		}
+		return *this;
+	}
+	
+	SharedPtr& assign(const SharedPtr& ptr)
+	{
+		if (&ptr != this)
+		{
+			SharedPtr tmp(ptr);
+			swap(tmp);
+		}
+		return *this;
+	}
+	
+	template <class Other, class OtherRP>
+	SharedPtr& assign(const SharedPtr<Other, RC, OtherRP>& ptr)
+	{
+		if (ptr.get() != _ptr)
+		{
+			SharedPtr tmp(ptr);
+			swap(tmp);
+		}
+		return *this;
+	}
+
+	void reset()
+	{
+		assign(0);
+	}
+
+	void reset(C* ptr)
+	{
+		assign(ptr);
+	}
+
+	void reset(const SharedPtr& ptr)
+	{
+		assign(ptr);
+	}
+
+	template <class Other, class OtherRP>
+	void reset(const SharedPtr<Other, RC, OtherRP>& ptr)
+	{
+		assign<Other, OtherRP>(ptr);
+	}
+
+	SharedPtr& operator = (C* ptr)
+	{
+		return assign(ptr);
+	}
+
+	SharedPtr& operator = (const SharedPtr& ptr)
+	{
+		return assign(ptr);
+	}
+
+	template <class Other, class OtherRP>
+	SharedPtr& operator = (const SharedPtr<Other, RC, OtherRP>& ptr)
+	{
+		return assign<Other>(ptr);
+	}
+
+	void swap(SharedPtr& ptr)
+	{
+		std::swap(_ptr, ptr._ptr);
+		std::swap(_pCounter, ptr._pCounter);
+	}
+
+	template <class Other> 
+	SharedPtr<Other, RC, RP> cast() const
+		/// 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, RC, RP>(_pCounter, pOther);
+		return SharedPtr<Other, RC, RP>();
+	}
+
+	template <class Other> 
+	SharedPtr<Other, RC, RP> unsafeCast() const
+		/// Casts the SharedPtr via a static cast to the given type.
+		/// Example: (assume class Sub: public Super)
+		///    SharedPtr<Super> super(new Sub());
+		///    SharedPtr<Sub> sub = super.unsafeCast<Sub>();
+		///    poco_assert (sub.get());
+	{
+		Other* pOther = static_cast<Other*>(_ptr);
+		return SharedPtr<Other, RC, RP>(_pCounter, pOther);
+	}
+
+	C* operator -> ()
+	{
+		return deref();
+	}
+
+	const C* operator -> () const
+	{
+		return deref();
+	}
+
+	C& operator * ()
+	{
+		return *deref();
+	}
+
+	const C& operator * () const
+	{
+		return *deref();
+	}
+
+	C* get()
+	{
+		return _ptr;
+	}
+
+	const C* get() const
+	{
+		return _ptr;
+	}
+
+	operator C* ()
+	{
+		return _ptr;
+	}
+	
+	operator const C* () const
+	{
+		return _ptr;
+	}
+
+	bool operator ! () const
+	{
+		return _ptr == 0;
+	}
+
+	bool isNull() const
+	{
+		return _ptr == 0;
+	}
+
+	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;
+	}
+	
+	int referenceCount() const
+	{
+		return _pCounter->referenceCount();
+	}
+
+private:
+	C* deref() const
+	{
+		if (!_ptr)
+			throw NullPointerException();
+
+		return _ptr;
+	}
+
+	void release()
+	{
+		poco_assert_dbg (_pCounter);
+		int i = _pCounter->release();
+		if (i == 0)
+		{
+			RP::release(_ptr);
+			_ptr = 0;
+
+			delete _pCounter;
+			_pCounter = 0;
+		}
+	}
+
+	SharedPtr(RC* pCounter, C* ptr): _pCounter(pCounter), _ptr(ptr)
+		/// for cast operation
+	{
+		poco_assert_dbg (_pCounter);
+		_pCounter->duplicate();
+	}
+
+private:
+	RC* _pCounter;
+	C*  _ptr;
+
+	template <class OtherC, class OtherRC, class OtherRP> friend class SharedPtr;
+};
+
+
+template <class C, class RC, class RP>
+inline void swap(SharedPtr<C, RC, RP>& p1, SharedPtr<C, RC, RP>& p2)
+{
+	p1.swap(p2);
+}
+
+
+} // namespace Poco
+
+
+#endif // Foundation_SharedPtr_INCLUDED