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/** \file \ingroup smoke
*/
/*
*
* Template Numerical Toolkit (TNT)
*
* Mathematical and Computational Sciences Division
* National Institute of Technology,
* Gaithersburg, MD USA
*
*
* This software was developed at the National Institute of Standards and
* Technology (NIST) by employees of the Federal Government in the course
* of their official duties. Pursuant to title 17 Section 105 of the
* United States Code, this software is not subject to copyright protection
* and is in the public domain. NIST assumes no responsibility whatsoever for
* its use by other parties, and makes no guarantees, expressed or implied,
* about its quality, reliability, or any other characteristic.
*
*/
#ifndef TNT_I_REFVEC_H
#define TNT_I_REFVEC_H
#include <cstdlib>
#include <iostream>
#ifdef TNT_BOUNDS_CHECK
#include <assert.h>
#endif
#ifndef NULL
#define NULL 0
#endif
namespace TNT
{
/*
Internal representation of ref-counted array. The TNT
arrays all use this building block.
<p>
If an array block is created by TNT, then every time
an assignment is made, the left-hand-side reference
is decreased by one, and the right-hand-side refernce
count is increased by one. If the array block was
external to TNT, the refernce count is a NULL pointer
regardless of how many references are made, since the
memory is not freed by TNT.
*/
template <class T>
class i_refvec
{
private:
T* data_;
int *ref_count_;
public:
i_refvec();
explicit i_refvec(int n);
inline i_refvec(T* data);
inline i_refvec(const i_refvec &v);
inline T* begin();
inline const T* begin() const;
inline T& operator[](int i);
inline const T& operator[](int i) const;
inline i_refvec<T> & operator=(const i_refvec<T> &V);
void copy_(T* p, const T* q, const T* e);
void set_(T* p, const T* b, const T* e);
inline int ref_count() const;
inline int is_null() const;
inline void destroy();
~i_refvec();
};
template <class T>
void i_refvec<T>::copy_(T* p, const T* q, const T* e)
{
for (T* t=p; q<e; t++, q++)
*t= *q;
}
template <class T>
i_refvec<T>::i_refvec() : data_(NULL), ref_count_(NULL) {}
/**
In case n is 0 or negative, it does NOT call new.
*/
template <class T>
i_refvec<T>::i_refvec(int n) : data_(NULL), ref_count_(NULL)
{
if (n >= 1)
{
#ifdef TNT_DEBUG
std::cout << "new data storage.\n";
#endif
data_ = new T[n];
ref_count_ = new int;
*ref_count_ = 1;
}
}
template <class T>
inline i_refvec<T>::i_refvec(const i_refvec<T> &V): data_(V.data_),
ref_count_(V.ref_count_)
{
if (V.ref_count_ != NULL)
(*(V.ref_count_))++;
}
template <class T>
i_refvec<T>::i_refvec(T* data) : data_(data), ref_count_(NULL) {}
template <class T>
inline T* i_refvec<T>::begin()
{
return data_;
}
template <class T>
inline const T& i_refvec<T>::operator[](int i) const
{
return data_[i];
}
template <class T>
inline T& i_refvec<T>::operator[](int i)
{
return data_[i];
}
template <class T>
inline const T* i_refvec<T>::begin() const
{
return data_;
}
template <class T>
i_refvec<T> & i_refvec<T>::operator=(const i_refvec<T> &V)
{
if (this == &V)
return *this;
if (ref_count_ != NULL)
{
(*ref_count_) --;
if ((*ref_count_) == 0)
destroy();
}
data_ = V.data_;
ref_count_ = V.ref_count_;
if (V.ref_count_ != NULL)
(*(V.ref_count_))++;
return *this;
}
template <class T>
void i_refvec<T>::destroy()
{
if (ref_count_ != NULL)
{
#ifdef TNT_DEBUG
std::cout << "destorying data... \n";
#endif
delete ref_count_;
#ifdef TNT_DEBUG
std::cout << "deleted ref_count_ ...\n";
#endif
if (data_ != NULL)
delete []data_;
#ifdef TNT_DEBUG
std::cout << "deleted data_[] ...\n";
#endif
data_ = NULL;
}
}
/*
* return 1 is vector is empty, 0 otherwise
*
* if is_null() is false and ref_count() is 0, then
*
*/
template<class T>
int i_refvec<T>::is_null() const
{
return (data_ == NULL ? 1 : 0);
}
/*
* returns -1 if data is external,
* returns 0 if a is NULL array,
* otherwise returns the positive number of vectors sharing
* this data space.
*/
template <class T>
int i_refvec<T>::ref_count() const
{
if (data_ == NULL)
return 0;
else
return (ref_count_ != NULL ? *ref_count_ : -1) ;
}
template <class T>
i_refvec<T>::~i_refvec()
{
if (ref_count_ != NULL)
{
(*ref_count_)--;
if (*ref_count_ == 0)
destroy();
}
}
} /* namespace TNT */
#endif
/* TNT_I_REFVEC_H */
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