GetFEM  5.4.4
dal_basic.h
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30 ===========================================================================*/
31 
32 /**@file dal_basic.h
33  @author Yves Renard <[email protected]>
34  @date June 01, 1995.
35  @brief Dynamic array class.
36 */
37 #ifndef DAL_BASIC_H__
38 #define DAL_BASIC_H__
39 
40 #include <vector>
41 #include "dal_config.h"
42 #include "getfem_omp.h"
43 
44 /// Dynamic Array Library
45 namespace dal
46 {
47  template<class T, unsigned char pks = 5> class dynamic_array;
48 
49  /// Iterator class for dynamic array.
50  template<class T, unsigned char pks> struct dna_iterator {
51  typedef T value_type;
52  typedef value_type* pointer;
53  typedef value_type& reference;
54  typedef size_t size_type;
55  typedef ptrdiff_t difference_type;
56  typedef std::random_access_iterator_tag iterator_category;
57 
58 # define DNAMPKS__ ((size_type(1) << pks) - 1)
59  dynamic_array<T,pks> *p;
60  size_type in;
61  pointer pT;
62 
63  dna_iterator(void) {}
64  dna_iterator(dynamic_array<T,pks> &da, size_type ii)
65  { p = &da; in = ii; pT = p->pt_to(in); }
66 
67  inline size_type index(void) const { return in; }
68  /// next element.
69  dna_iterator operator ++(int) {
70  dna_iterator tmp = *this;
71  if ((++in)&DNAMPKS__) pT++; else pT=p->pt_to(in); return tmp;
72  }
73  /// previous element.
74  dna_iterator operator --(int) {
75  dna_iterator tmp = *this;
76  if ((in--)&DNAMPKS__) pT--; else pT=p->pt_to(in); return tmp;
77  }
78  /// next element.
79  dna_iterator &operator ++()
80  { if ((++in)&DNAMPKS__) pT++; else pT=p->pt_to(in); return *this; }
81  /// previous element.
82  dna_iterator &operator --()
83  { if ((in--)&DNAMPKS__) pT--; else pT=p->pt_to(in); return *this; }
84  /// go i elements forward.
85  dna_iterator &operator +=(difference_type i)
86  { in += i; pT=p->pt_to(in); return *this; }
87  /// go i elements backward.
88  dna_iterator &operator -=(difference_type i)
89  { in -= i; pT=p->pt_to(in); return *this; }
90  /// gives an iterator pointing i elements forward.
91  dna_iterator operator +(difference_type i) const
92  { dna_iterator it = *this; return (it += i); }
93  /// gives an iterator pointing i elements backward.
94  dna_iterator operator -(difference_type i) const
95  { dna_iterator it = *this; return (it -= i); }
96  /// Gives the difference, in term of elements between two iterators.
97  difference_type operator -(const dna_iterator &i) const
98  { return difference_type(in - i.in); }
99 
100  reference operator *() const { return (*pT); }
101  pointer operator ->() const { return pT; }
102  reference operator [](size_type ii) const { return (*p)[in+ii]; }
103 
104  bool operator ==(const dna_iterator &i) const { return (i.in==in);}
105  bool operator !=(const dna_iterator &i) const { return (i.in!=in);}
106  bool operator < (const dna_iterator &i) const { return ( in<i.in);}
107  bool operator >=(const dna_iterator &i) const { return ( in>=i.in);}
108  bool operator > (const dna_iterator &i) const { return ( in>i.in);}
109  };
110 
111  /// Constant iterator class for dynamic array.
112  template<class T, unsigned char pks> struct dna_const_iterator {
113  typedef T value_type;
114  typedef const value_type* pointer;
115  typedef const value_type& reference;
116  typedef size_t size_type;
117  typedef ptrdiff_t difference_type;
118  typedef std::random_access_iterator_tag iterator_category;
119 
120 # define DNAMPKS__ ((size_type(1) << pks) - 1)
121  const dynamic_array<T,pks> *p;
122  size_type in;
123  pointer pT;
124 
125  dna_const_iterator(void) {}
126  dna_const_iterator(const dynamic_array<T,pks> &da, size_type ii)
127  { p = &da; in = ii; pT = p->pt_to(in); }
128  dna_const_iterator(const dna_iterator<T, pks> &it)
129  : p(it.p), in(it.in), pT(it.pT) {}
130 
131  inline size_type index(void) const { return in; }
132  dna_const_iterator operator ++(int) {
133  dna_const_iterator tmp = *this;
134  if ((++in)&DNAMPKS__) pT++; else pT=p->pt_to(in); return tmp;
135  }
136  dna_const_iterator operator --(int) {
137  dna_const_iterator tmp = *this;
138  if ((in--)&DNAMPKS__) pT--; else pT=p->pt_to(in); return tmp;
139  }
140  dna_const_iterator &operator ++()
141  { if ((++in)&DNAMPKS__) pT++; else pT=p->pt_to(in); return *this; }
142  dna_const_iterator &operator --()
143  { if ((in--)&DNAMPKS__) pT--; else pT=p->pt_to(in); return *this; }
144  dna_const_iterator &operator +=(difference_type i)
145  { in += i; pT=p->pt_to(in); return *this; }
146  dna_const_iterator &operator -=(difference_type i)
147  { in -= i; pT=p->pt_to(in); return *this; }
148  dna_const_iterator operator +(difference_type i) const
149  { dna_const_iterator it = *this; return (it += i); }
150  dna_const_iterator operator -(difference_type i) const
151  { dna_const_iterator it = *this; return (it -= i); }
152  difference_type operator -(const dna_const_iterator &i) const
153  { return difference_type(in - i.in); }
154 
155  reference operator *() const { return (*pT); }
156  pointer operator ->() const { return pT; }
157  reference operator [](size_type ii) const { return (*p)[in+ii]; }
158 
159  bool operator ==(const dna_const_iterator &i) const
160  { return (i.in == in); }
161  bool operator !=(const dna_const_iterator &i) const
162  { return (i.in != in); }
163  bool operator < (const dna_const_iterator &i) const
164  { return (in < i.in); }
165  bool operator >=(const dna_const_iterator &i) const
166  { return (i.in >= in); }
167  bool operator > (const dna_const_iterator &i) const
168  { return (in > i.in); }
169  };
170 
171  /** Dynamic Array. Defines the basic container of the library which is
172  * dal::dynamic_array<T, pks>. This container is virtually an
173  * infinite array of element of type T. When a random acces tab[i] is
174  * called, a control is made on i and an allocation is made if
175  * needed. The allocation is made by blocks of n elements, where
176  * @f$n = 2^{pks}@f$. @f$pks@f$ is an optional parameter assumed to be 5.
177  * The structure of this container is similar to the one of std::deque<T>
178  * but with a faster random access.
179  *
180  *
181  * <h3>Example of code</h3>
182  * If T is any type (with or without trivial constructor/destructor,
183  * and with constructor T(0) and T(1)), the
184  * following code is valid:
185  * @code
186  * #include<dal_basic.h>
187  * dal::dynamic_array<T> tab;
188  * tab[50] = T(0); // 51 elements in tab.
189  * std::fill(tab.begin(), tab.end(), T(0)); // 51 elements initialized
190  * dal::dynamic_array<T>::iterator it = tab.begin();
191  * dal::dynamic_array<T>::iterator ite = it + 50;
192  * for( ; it != ite; ++it)
193  * { *it = T(1); } // only the 50 first elements are changed.
194  * @endcode
195  */
196  template<class T, unsigned char pks> class dynamic_array {
197  public :
198 
199  typedef T value_type;
200  typedef value_type* pointer;
201  typedef const value_type* const_pointer;
202  typedef value_type& reference;
203  typedef const value_type& const_reference;
204  typedef size_t size_type;
205  typedef ptrdiff_t difference_type;
206  typedef unsigned char pack_size_type;
207  typedef std::vector<std::unique_ptr<T[]>> pointer_array;
208  typedef dna_iterator<T, pks> iterator;
209  typedef dna_const_iterator<T, pks> const_iterator;
210  typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
211  typedef std::reverse_iterator<iterator> reverse_iterator;
212 
213  protected :
214 
215 # define DNAMPKS__ ((size_type(1) << pks) - 1)
216  pointer_array array;
217  pack_size_type ppks; /* size of pointer packs (2^ppks). */
218  size_type m_ppks; /* = (2^ppks) - 1. */
219  size_type last_ind; /* allocated = 0 .. last_ind-1. */
220  size_type last_accessed; /* valid = 0 .. last_accessed-1. */
221 
222  public :
223 
224  /// Number of allocated elements.
225  size_type size(void) const { return last_accessed; }
226  size_type capacity(void) const { return last_ind; }
227  size_type max_size(void) const { return (size_type(-1)) / 2; }
228  /// True if no space is allocated.
229  bool empty(void) const { return last_accessed == 0; }
230  /// Iterator on the first element.
231  iterator begin(void) { return iterator(*this, 0); }
232  /// Constant iterator on the first element.
233  const_iterator begin(void) const { return const_iterator(*this, 0); }
234  /// Iterator on the last + 1 element.
235  iterator end(void) { return iterator(*this, size()); }
236  /// Constant iterator on the last + 1 element.
237  const_iterator end(void) const
238  { return const_iterator(*this, size()); }
239  reverse_iterator rbegin(void) { return reverse_iterator(end()); }
240  const_reverse_iterator rbegin(void) const
241  { return const_reverse_iterator(end()); }
242  reverse_iterator rend(void) { return reverse_iterator(begin()); }
243  const_reverse_iterator rend(void) const
244  { return const_reverse_iterator(begin()); }
245 
246  reference front(void) { return *begin(); }
247  const_reference front(void) const { return *begin(); }
248  reference back(void) { return *(end() - 1); }
249  const_reference back(void) const { return *(end() - 1); }
250 
251  void swap(dynamic_array<T,pks> &da);
252  /// Clear and desallocate all the elements.
253  void clear(void);
254  dynamic_array<T,pks> &operator =(const dynamic_array<T,pks> &da);
255 
256  protected:
257 
258  void init(void)
259  { last_accessed = last_ind = 0; array.resize(8); ppks = 3; m_ppks = 7; }
260 
261 
262  public:
263 
264  dynamic_array(const dynamic_array<T,pks> &da) { init(); *this = da; }
265  dynamic_array(void) { init(); }
266  // ~dynamic_array(void) { clear(); }
267  inline pointer pt_to(size_type ii) /* used by iterators. */
268  { return (ii >=last_ind) ? NULL : &((array[ii>>pks])[ii&DNAMPKS__]); }
269  inline const_pointer pt_to(size_type ii) const
270  { return (ii >=last_ind) ? NULL : &((array[ii>>pks])[ii&DNAMPKS__]); }
271 
272  /// Gives a constant reference on element ii.
273  const_reference operator [](size_type ii) const;
274  /// Gives a reference on element ii.
275  reference operator [](size_type ii);
276  void resize(size_type i) { (*this)[i-1]; }
277 
278  /// Gives the total memory occupied by the array.
279  size_type memsize(void) const {
280  return sizeof(pointer) * array.capacity()
281  + last_ind*sizeof(T) + sizeof(dynamic_array<T,pks>);
282  }
283 
284  /// Swap element i1 and i2.
285  void swap(size_type i1, size_type i2)
286  { std::swap((*this)[i1], (*this)[i2]); }
287  };
288 
289 
290  /* ********************************************************************* */
291  /* Member functions */
292  /* ********************************************************************* */
293 
294 
295  template<class T, unsigned char pks>
296  void dynamic_array<T,pks>::swap(dynamic_array<T,pks> &da) {
297  array.swap(da.array);
298  std::swap(last_ind, da.last_ind);
299  std::swap(last_accessed, da.last_accessed);
300  std::swap(ppks, da.ppks); std::swap(m_ppks, da.m_ppks);
301  }
302 
303  template<class T, unsigned char pks>
304  void dynamic_array<T,pks>::clear(void) {
305  // typename pointer_array::iterator it = array.begin();
306  // typename pointer_array::iterator ite = it+ ((last_ind + DNAMPKS__) >> pks);
307  // while (it != ite) delete[] *it++;
308  array.clear(); init();
309  }
310 
311  template<class T, unsigned char pks> dynamic_array<T,pks>
312  &dynamic_array<T,pks>::operator = (const dynamic_array<T,pks> &da) {
313  array.resize(da.array.size());
314  last_ind = da.last_ind;
315  last_accessed = da.last_accessed;
316  ppks = da.ppks; m_ppks = da.m_ppks;
317  typename pointer_array::iterator it = array.begin();
318  typename pointer_array::const_iterator ita = da.array.begin();
319  typename pointer_array::iterator ite = it+ ((last_ind + DNAMPKS__) >> pks);
320  while (it != ite) {
321  *it = std::unique_ptr<T[]>(new T[DNAMPKS__+1]);// std::make_unique<T[]>(DNAMPKS__+1);
322  pointer p = it->get(); ++it;
323  pointer pe = p + (DNAMPKS__+1);
324  const_pointer pa = (ita++)->get();
325  while (p != pe) *p++ = *pa++;
326  }
327  return *this;
328  }
329 
330  template<class T, unsigned char pks>
331  typename dynamic_array<T,pks>::const_reference
332  dynamic_array<T,pks>::operator [](size_type ii) const {
333  THREAD_SAFE_STATIC T f;
334  return (ii<last_ind) ? (array[ii>>pks])[ii&DNAMPKS__] : f;
335  }
336 
337  template<class T, unsigned char pks> typename dynamic_array<T,pks>::reference
338  dynamic_array<T,pks>::operator [](size_type ii) {
339  if (ii >= last_accessed) {
340  GMM_ASSERT2(ii < INT_MAX, "out of range");
341 
342  last_accessed = ii + 1;
343  if (ii >= last_ind) {
344  if ((ii >> (pks+ppks)) > 0) {
345  while ((ii >> (pks+ppks)) > 0) ppks++;
346  array.resize(m_ppks = (size_type(1) << ppks)); m_ppks--;
347  }
348  for (size_type jj = (last_ind >> pks); ii >= last_ind;
349  jj++, last_ind += (DNAMPKS__ + 1)){
350  array[jj] = std::unique_ptr<T[]>(new T[DNAMPKS__+1]);
351  } // std::make_unique<T[]>(DNAMPKS__ + 1); }
352  }
353  }
354  return (array[ii >> pks])[ii & DNAMPKS__];
355  }
356 
357 
358  /* ********************************************************************* */
359  /* Templates functions */
360  /* ********************************************************************* */
361 
362  template<class T, unsigned char pks>
363  bool operator==(const dynamic_array<T,pks> &x,
364  const dynamic_array<T,pks> &y) {
365  typename dynamic_array<T,pks>::const_iterator itxb=x.begin(), itxe=x.end();
366  typename dynamic_array<T,pks>::const_iterator ityb=y.begin(), itye=y.end();
367  typename dynamic_array<T,pks>::size_type d = std::min(itxe-itxb,itye-ityb);
368  typename dynamic_array<T,pks>::const_iterator itxc = itxb+d, ityc = ityb+d;
369 
370  if (!std::equal(itxb, itxc, ityb)) return false;
371  for (; itxc != itxe; itxc++) if (*itxc != T()) return false;
372  for (; ityc != itye; ityc++) if (*ityc != T()) return false;
373  return true;
374  }
375 
376  template<class T, unsigned char pks>
377  bool operator < (const dynamic_array<T,pks> &x,
378  const dynamic_array<T,pks> &y)
379  { return std::lexicographical_compare(x.begin(),x.end(),y.begin(),y.end()); }
380 
381  template<class T, unsigned char pks> inline
382  void swap(const dynamic_array<T,pks> &x, const dynamic_array<T,pks> &y)
383  { x.swap(y); }
384 
385 }
386 #endif /* DAL_BASIC_H__ */
dal::dynamic_array
Dynamic Array.
Definition: dal_basic.h:196
dal::dynamic_array::memsize
size_type memsize(void) const
Gives the total memory occupied by the array.
Definition: dal_basic.h:279
dal::dynamic_array::end
const_iterator end(void) const
Constant iterator on the last + 1 element.
Definition: dal_basic.h:237
dal::dynamic_array::begin
iterator begin(void)
Iterator on the first element.
Definition: dal_basic.h:231
dal::dynamic_array::empty
bool empty(void) const
True if no space is allocated.
Definition: dal_basic.h:229
dal::dynamic_array::size
size_type size(void) const
Number of allocated elements.
Definition: dal_basic.h:225
dal::dynamic_array::clear
void clear(void)
Clear and desallocate all the elements.
Definition: dal_basic.h:304
dal::dynamic_array::end
iterator end(void)
Iterator on the last + 1 element.
Definition: dal_basic.h:235
dal::dynamic_array::begin
const_iterator begin(void) const
Constant iterator on the first element.
Definition: dal_basic.h:233
dal::dynamic_array::swap
void swap(size_type i1, size_type i2)
Swap element i1 and i2.
Definition: dal_basic.h:285
dal::dynamic_array::operator[]
const_reference operator[](size_type ii) const
Gives a constant reference on element ii.
Definition: dal_basic.h:332
dal_config.h
defines and typedefs for namespace dal
getfem_omp.h
Tools for multithreaded, OpenMP and Boost based parallelization.
bgeot::size_type
size_t size_type
used as the common size type in the library
Definition: bgeot_poly.h:49
dal
Dynamic Array Library.
Definition: dal_backtrace.cc:29
dal::dna_const_iterator
Constant iterator class for dynamic array.
Definition: dal_basic.h:112
dal::dna_iterator
Iterator class for dynamic array.
Definition: dal_basic.h:50
dal::dna_iterator::operator++
dna_iterator & operator++()
next element.
Definition: dal_basic.h:79
dal::dna_iterator::operator+=
dna_iterator & operator+=(difference_type i)
go i elements forward.
Definition: dal_basic.h:85
dal::dna_iterator::operator-
dna_iterator operator-(difference_type i) const
gives an iterator pointing i elements backward.
Definition: dal_basic.h:94
dal::dna_iterator::operator--
dna_iterator & operator--()
previous element.
Definition: dal_basic.h:82
dal::dna_iterator::operator+
dna_iterator operator+(difference_type i) const
gives an iterator pointing i elements forward.
Definition: dal_basic.h:91
dal::dna_iterator::operator-=
dna_iterator & operator-=(difference_type i)
go i elements backward.
Definition: dal_basic.h:88