src/math/tnt_i_refvec.hpp

/*
*
* 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 */

Revision:	3495
Committed:	Tue Apr 7 20:16:26 2009 UTC (16 years ago) by gezelter
File size:	4396 byte(s)
Log Message:	adding jama and tnt libraries for various linear algebra routines
#	Content
1	/*
2	*
3	* Template Numerical Toolkit (TNT)
4	*
5	* Mathematical and Computational Sciences Division
6	* National Institute of Technology,
7	* Gaithersburg, MD USA
8	*
9	*
10	* This software was developed at the National Institute of Standards and
11	* Technology (NIST) by employees of the Federal Government in the course
12	* of their official duties. Pursuant to title 17 Section 105 of the
13	* United States Code, this software is not subject to copyright protection
14	* and is in the public domain. NIST assumes no responsibility whatsoever for
15	* its use by other parties, and makes no guarantees, expressed or implied,
16	* about its quality, reliability, or any other characteristic.
17	*
18	*/
19
20
21
22	#ifndef TNT_I_REFVEC_H
23	#define TNT_I_REFVEC_H
24
25	#include <cstdlib>
26	#include <iostream>
27
28	#ifdef TNT_BOUNDS_CHECK
29	#include <assert.h>
30	#endif
31
32	#ifndef NULL
33	#define NULL 0
34	#endif
35
36	namespace TNT
37	{
38	/*
39	Internal representation of ref-counted array. The TNT
40	arrays all use this building block.
41
42	<p>
43	If an array block is created by TNT, then every time
44	an assignment is made, the left-hand-side reference
45	is decreased by one, and the right-hand-side refernce
46	count is increased by one. If the array block was
47	external to TNT, the refernce count is a NULL pointer
48	regardless of how many references are made, since the
49	memory is not freed by TNT.
50
51
52
53	*/
54	template <class T>
55	class i_refvec
56	{
57
58
59	private:
60	T* data_;
61	int *ref_count_;
62
63
64	public:
65
66	i_refvec();
67	explicit i_refvec(int n);
68	inline i_refvec(T* data);
69	inline i_refvec(const i_refvec &v);
70	inline T* begin();
71	inline const T* begin() const;
72	inline T& operator[](int i);
73	inline const T& operator[](int i) const;
74	inline i_refvec<T> & operator=(const i_refvec<T> &V);
75	void copy_(T* p, const T* q, const T* e);
76	void set_(T* p, const T* b, const T* e);
77	inline int ref_count() const;
78	inline int is_null() const;
79	inline void destroy();
80	~i_refvec();
81
82	};
83
84	template <class T>
85	void i_refvec<T>::copy_(T* p, const T* q, const T* e)
86	{
87	for (T* t=p; q<e; t++, q++)
88	t= q;
89	}
90
91	template <class T>
92	i_refvec<T>::i_refvec() : data_(NULL), ref_count_(NULL) {}
93
94	/**
95	In case n is 0 or negative, it does NOT call new.
96	*/
97	template <class T>
98	i_refvec<T>::i_refvec(int n) : data_(NULL), ref_count_(NULL)
99	{
100	if (n >= 1)
101	{
102	#ifdef TNT_DEBUG
103	std::cout << "new data storage.\n";
104	#endif
105	data_ = new T[n];
106	ref_count_ = new int;
107	*ref_count_ = 1;
108	}
109	}
110
111	template <class T>
112	inline i_refvec<T>::i_refvec(const i_refvec<T> &V): data_(V.data_),
113	ref_count_(V.ref_count_)
114	{
115	if (V.ref_count_ != NULL)
116	(*(V.ref_count_))++;
117	}
118
119
120	template <class T>
121	i_refvec<T>::i_refvec(T* data) : data_(data), ref_count_(NULL) {}
122
123	template <class T>
124	inline T* i_refvec<T>::begin()
125	{
126	return data_;
127	}
128
129	template <class T>
130	inline const T& i_refvec<T>::operator[](int i) const
131	{
132	return data_[i];
133	}
134
135	template <class T>
136	inline T& i_refvec<T>::operator[](int i)
137	{
138	return data_[i];
139	}
140
141
142	template <class T>
143	inline const T* i_refvec<T>::begin() const
144	{
145	return data_;
146	}
147
148
149
150	template <class T>
151	i_refvec<T> & i_refvec<T>::operator=(const i_refvec<T> &V)
152	{
153	if (this == &V)
154	return *this;
155
156
157	if (ref_count_ != NULL)
158	{
159	(*ref_count_) --;
160	if ((*ref_count_) == 0)
161	destroy();
162	}
163
164	data_ = V.data_;
165	ref_count_ = V.ref_count_;
166
167	if (V.ref_count_ != NULL)
168	(*(V.ref_count_))++;
169
170	return *this;
171	}
172
173	template <class T>
174	void i_refvec<T>::destroy()
175	{
176	if (ref_count_ != NULL)
177	{
178	#ifdef TNT_DEBUG
179	std::cout << "destorying data... \n";
180	#endif
181	delete ref_count_;
182
183	#ifdef TNT_DEBUG
184	std::cout << "deleted ref_count_ ...\n";
185	#endif
186	if (data_ != NULL)
187	delete []data_;
188	#ifdef TNT_DEBUG
189	std::cout << "deleted data_[] ...\n";
190	#endif
191	data_ = NULL;
192	}
193	}
194
195	/*
196	* return 1 is vector is empty, 0 otherwise
197	*
198	* if is_null() is false and ref_count() is 0, then
199	*
200	*/
201	template<class T>
202	int i_refvec<T>::is_null() const
203	{
204	return (data_ == NULL ? 1 : 0);
205	}
206
207	/*
208	* returns -1 if data is external,
209	* returns 0 if a is NULL array,
210	* otherwise returns the positive number of vectors sharing
211	* this data space.
212	*/
213	template <class T>
214	int i_refvec<T>::ref_count() const
215	{
216	if (data_ == NULL)
217	return 0;
218	else
219	return (ref_count_ != NULL ? *ref_count_ : -1) ;
220	}
221
222	template <class T>
223	i_refvec<T>::~i_refvec()
224	{
225	if (ref_count_ != NULL)
226	{
227	(*ref_count_)--;
228
229	if (*ref_count_ == 0)
230	destroy();
231	}
232	}
233
234
235	} /* namespace TNT */
236
237
238
239
240
241	#endif
242	/* TNT_I_REFVEC_H */
243