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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#ifndef REF_COUNTING_POINTER_H
#define REF_COUNTING_POINTER_H
#include <iostream>
#include "apache/das/DASNullPointerException.h"
namespace apache {
namespace das {
template <class T>
class RefCountingPointer {
public:
/*SDO_API*/ RefCountingPointer(T* realPtr = 0, bool objectOwner = true);
RefCountingPointer(const RefCountingPointer<T>& rhs, bool objectOwner = true);
/*SDO_API*/ RefCountingPointer(T& rhs, bool objectOwner = true);
/*SDO_API*/ virtual ~RefCountingPointer(void);
/*SDO_API*/ RefCountingPointer& operator=(const RefCountingPointer<T>& rhs);
/*SDO_API*/ bool operator==(RefCountingPointer<T>& test) const;
/*SDO_API*/ T* operator->() const;
/*SDO_API*/ T& operator*() const;
/*SDO_API*/ bool operator!() const;
bool isObjectOwner(void) const;
#ifdef MFT
// MFT == member function templates
// Notes on the items below.
// In our code, we use subclasses to expose the API, and super
// classes to implement. E,g DataObject and DataObjectImpl.
// In some cases, we know that the DataObject given to us is a
// DataObjectImpl, and cast it. With RefCountingPointers, however,
// the cast cannot work, as the RefCountingPointer to the superclass
// is not related to the RCP to the subclass. Recent changes in the
// C++ language allow this to work by defining an operator which
// causes a pointer of the other type to be returned, as long as pointee
// is acceptable as a parameter to the cosntructor of the other type
// of pointer. This works in C++.NET, but not in C++6:
operator RefCountingPointer<otherType>()
{
return RefCountingPointer<otherType>(pointee);
}
// Since we are using C6, a possible workround is to provide a method
// which returns the dumb pointer, then construct a pointer to the
// base class from the pointer returned. This is that the operator T* does.
// The code in DataObject could be simpler if we used C7,and we should
// discusss changing.
#else
operator T*() {return pointee;}
#endif
template <class otherType>
operator RefCountingPointer<otherType>()
{
return RefCountingPointer<otherType>(pointee);
}
friend std::ostream& operator<< (std::ostream &os, const RefCountingPointer<T>& ptr)
{
if (!ptr)
{
os << "NULL" << std::endl;
}
else
{
ptr->printSelf(os);
}
return os;
}
private:
T *pointee;
bool objectOwner;
void init();
};
};
};
#endif //REF_COUNTING_POINTER_H
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