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/*
* Copyright (c) 1999-2005 Mark D. Hill and David A. Wood
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef REFCNT_H
#define REFCNT_H
template <class TYPE>
class RefCnt {
public:
// Constructors
RefCnt();
RefCnt(const TYPE& data);
// Destructor
~RefCnt();
// Public Methods
const TYPE* ref() const { return m_data_ptr; }
TYPE* ref() { return m_data_ptr; }
TYPE* mod_ref() const { return m_data_ptr; }
void freeRef();
void print(ostream& out) const;
// Public copy constructor and assignment operator
RefCnt(const RefCnt& obj);
RefCnt& operator=(const RefCnt& obj);
private:
// Private Methods
// Data Members (m_ prefix)
TYPE* m_data_ptr;
// int* m_count_ptr; // Not used yet
};
// Output operator declaration
template <class TYPE>
inline
ostream& operator<<(ostream& out, const RefCnt<TYPE>& obj);
// ******************* Definitions *******************
// Constructors
template <class TYPE>
inline
RefCnt<TYPE>::RefCnt()
{
m_data_ptr = NULL;
}
template <class TYPE>
inline
RefCnt<TYPE>::RefCnt(const TYPE& data)
{
m_data_ptr = data.clone();
m_data_ptr->setRefCnt(1);
}
template <class TYPE>
inline
RefCnt<TYPE>::~RefCnt()
{
freeRef();
}
template <class TYPE>
inline
void RefCnt<TYPE>::freeRef()
{
if (m_data_ptr != NULL) {
m_data_ptr->decRefCnt();
if (m_data_ptr->getRefCnt() == 0) {
m_data_ptr->destroy();
}
m_data_ptr = NULL;
}
}
template <class TYPE>
inline
void RefCnt<TYPE>::print(ostream& out) const
{
if (m_data_ptr == NULL) {
out << "[RefCnt: Null]";
} else {
out << "[RefCnt: ";
m_data_ptr->print(out);
out << "]";
}
}
// Copy constructor
template <class TYPE>
inline
RefCnt<TYPE>::RefCnt(const RefCnt<TYPE>& obj)
{
// m_data_ptr = obj.m_data_ptr->clone();
m_data_ptr = obj.m_data_ptr;
// Increment the reference count
if (m_data_ptr != NULL) {
m_data_ptr->incRefCnt();
}
}
// Assignment operator
template <class TYPE>
inline
RefCnt<TYPE>& RefCnt<TYPE>::operator=(const RefCnt<TYPE>& obj)
{
if (this == &obj) {
// If this is the case, do nothing
// assert(false);
} else {
freeRef();
m_data_ptr = obj.m_data_ptr;
if (m_data_ptr != NULL) {
m_data_ptr->incRefCnt();
}
}
return *this;
}
// Output operator definition
template <class TYPE>
inline
ostream& operator<<(ostream& out, const RefCnt<TYPE>& obj)
{
obj.print(out);
out << flush;
return out;
}
#endif //REFCNT_H
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