Dune Core Modules (2.5.0)

elementinfo.hh
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1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_ALBERTA_ELEMENTINFO_HH
4#define DUNE_ALBERTA_ELEMENTINFO_HH
5
11#include <cassert>
12#include <vector>
13#include <utility>
14
15#include <dune/grid/albertagrid/geometrycache.hh>
16#include <dune/grid/albertagrid/macroelement.hh>
17
18#if HAVE_ALBERTA
19
20namespace Dune
21{
22
23 namespace Alberta
24 {
25
26 // External Forward Declarations
27 // -----------------------------
28
29 template< int dim >
30 class MeshPointer;
31
32 struct BasicNodeProjection;
33
34
35
36 // ElementInfo
37 // -----------
38
39 template< int dim >
40 class ElementInfo
41 {
42 struct Instance;
43 class Stack;
44
45 template< int >
46 struct Library;
47
48 typedef Instance *InstancePtr;
49
50 public:
51 static const int dimension = dim;
52
53 static const int numVertices = NumSubEntities< dimension, dimension >::value;
54 static const int numFaces = NumSubEntities< dimension, 1 >::value;
55
56 typedef Alberta::MacroElement< dimension > MacroElement;
57 typedef Alberta::MeshPointer< dimension > MeshPointer;
58 typedef Alberta::FillFlags< dimension > FillFlags;
59
60 static const int maxNeighbors = N_NEIGH_MAX;
61
62 static const int maxLevelNeighbors = Library< dimWorld >::maxLevelNeighbors;
63
64#if !DUNE_ALBERTA_CACHE_COORDINATES
65 typedef GeometryCacheProxy< dim > GeometryCache;
66#endif
67
68 struct Seed;
69
70 private:
71 explicit ElementInfo ( const InstancePtr &instance );
72
73 public:
74 ElementInfo ();
75 ElementInfo ( const MeshPointer &mesh, const MacroElement &macroElement,
76 typename FillFlags::Flags fillFlags = FillFlags::standard );
77 ElementInfo ( const MeshPointer &mesh, const Seed &seed,
78 typename FillFlags::Flags fillFlags = FillFlags::standard );
79 ElementInfo ( const ElementInfo &other );
80 ElementInfo ( ElementInfo&& other );
81
82 ~ElementInfo ();
83
84 ElementInfo &operator= ( const ElementInfo &other );
85 ElementInfo &operator= ( ElementInfo &&other );
86
87 operator bool () const { return (instance_ != null()); }
88
89 bool operator== ( const ElementInfo &other ) const;
90 bool operator!= ( const ElementInfo &other ) const;
91
92 const MacroElement &macroElement () const;
93 ElementInfo father () const;
94 int indexInFather () const;
95 ElementInfo child ( int i ) const;
96 bool isLeaf () const;
97
98 Seed seed () const;
99
100 MeshPointer mesh () const;
101
102 bool mightVanish () const;
103
104 int level () const;
105 // see ALBERTA documentation for definition of element type
106 // values are 0, 1, 2
107 int type () const;
108
109 int getMark () const;
110 void setMark ( int refCount ) const;
111
112 bool hasLeafNeighbor ( const int face ) const;
113 ElementInfo leafNeighbor ( const int face ) const;
114
115 /* obtain all level neighbors of a face
116 *
117 * param[in] face face for which the neighbors are desired
118 * param[out] neighbor array storing the neighbors
119 * param[out] faceInNeighbor array storing the faces in neighbor
120 * (-1, if this neighbor does not exist)
121 *
122 * returns (potential) number of neighbors (i.e., the number of valid
123 * entries in the output arrays
124 */
125 int levelNeighbors ( const int face, ElementInfo (&neighbor)[ maxLevelNeighbors ], int (&faceInNeighbor)[ maxLevelNeighbors ] ) const;
126
127 template< int codim >
128 int twist ( int subEntity ) const;
129 int twistInNeighbor ( int face ) const;
130 bool isBoundary ( int face ) const;
131 int boundaryId ( int face ) const;
132 AffineTransformation *transformation ( int face ) const;
133 BasicNodeProjection *boundaryProjection ( int face ) const;
134
135 bool hasCoordinates () const;
136 const GlobalVector &coordinate ( int vertex ) const;
137#if !DUNE_ALBERTA_CACHE_COORDINATES
138 GeometryCache geometryCache () const
139 {
140 return GeometryCache( instance_->geometryCache, instance_->elInfo );
141 }
142#endif
143
144 template< class Functor >
145 void hierarchicTraverse ( Functor &functor ) const;
146
147 template< class Functor >
148 void leafTraverse ( Functor &functor ) const;
149
150 const Element *element () const;
151 const Element *neighbor ( int face ) const;
152 Element *el () const;
153 ALBERTA EL_INFO &elInfo () const;
154
155 static ElementInfo
156 createFake ( const MeshPointer &mesh,
157 const Element *element, int level, int type = 0 );
158 static ElementInfo createFake ( const ALBERTA EL_INFO &elInfo );
159
160 private:
161 static bool isLeaf ( Element *element );
162 static bool mightVanish ( Element *element, int depth );
163
164 static void fill ( Mesh *mesh, const ALBERTA MACRO_EL *mel, ALBERTA EL_INFO &elInfo );
165 static void fill ( int ichild, const ALBERTA EL_INFO &parentInfo, ALBERTA EL_INFO &elInfo );
166
167 void addReference () const;
168 void removeReference () const;
169
170 static InstancePtr null ();
171 static Stack &stack ();
172
173 InstancePtr instance_;
174 };
175
176
177
178 // ElementInfo::Instance
179 // ---------------------
180
181 template< int dim >
182 struct ElementInfo< dim >::Instance
183 {
184 ALBERTA EL_INFO elInfo;
185 unsigned int refCount;
186
187 InstancePtr &parent ()
188 {
189 return parent_;
190 }
191
192 private:
193 InstancePtr parent_;
194
195#if !DUNE_ALBERTA_CACHE_COORDINATES
196 public:
197 Alberta::GeometryCache< dim > geometryCache;
198#endif
199 };
200
201
202
203 // ElementInfo::Stack
204 // ------------------
205
206 template< int dim >
207 class ElementInfo< dim >::Stack
208 {
209 InstancePtr top_;
210 Instance null_;
211
212 public:
213 Stack ();
214 ~Stack ();
215
216 InstancePtr allocate ();
217 void release ( InstancePtr &p );
218 InstancePtr null ();
219 };
220
221
222
223 // ElementInfo::Library
224 // --------------------
225
226 template< int dim >
227 template< int >
228 struct ElementInfo< dim >::Library
229 {
230 typedef Alberta::ElementInfo< dim > ElementInfo;
231
232 static const int maxLevelNeighbors = (1 << (dim-1));
233
234 static int
235 leafNeighbor ( const ElementInfo &element, const int face, ElementInfo &neighbor );
236
237 static int
238 levelNeighbors ( const ElementInfo &element, const int face,
239 ElementInfo (&neighbor)[ maxLevelNeighbors ], int (&faceInNeighbor)[ maxLevelNeighbors ] );
240
241 private:
242 static int
243 macroNeighbor ( const ElementInfo &element, const int face, ElementInfo &neighbor );
244 };
245
246
247
248 // ElementInfo::Seed
249 // -----------------
250
251 template< int dim >
252 struct ElementInfo< dim >::Seed
253 {
254 Seed ()
255 : macroIndex_( -1 ), level_( 0 ), path_( 0 )
256 {}
257
258 Seed ( const int macroIndex, const int level, const unsigned long path )
259 : macroIndex_( macroIndex ), level_( level ), path_( path )
260 {}
261
262 bool operator== ( const Seed &other ) const
263 {
264 return (macroIndex() == other.macroIndex()) && (level() == other.level()) && (path() == other.path());
265 }
266
267 bool operator< ( const Seed &other ) const
268 {
269 const bool ml = (macroIndex() < other.macroIndex());
270 const bool me = (macroIndex() == other.macroIndex());
271 const bool ll = (level() < other.level());
272 const bool le = (level() == other.level());
273 const bool pl = (path() < other.path());
274 return ml | (me & (ll | (le & pl)));
275 }
276
277 bool operator!= ( const Seed &other ) const { return !(*this == other); }
278 bool operator<= ( const Seed &other ) const { return !(other < *this); }
279 bool operator> ( const Seed &other ) const { return (other < *this); }
280 bool operator>= ( const Seed &other ) const { return !(*this < other); }
281
282 bool isValid ( ) const { return macroIndex_ != -1; }
283
284 int macroIndex () const { return macroIndex_; }
285 int level () const { return level_; }
286 unsigned long path () const { return path_; }
287
288 private:
289 int macroIndex_;
290 int level_;
291 unsigned long path_;
292 };
293
294
295
296 // Implementation of ElementInfo
297 // -----------------------------
298
299 template< int dim >
300 inline ElementInfo< dim >::ElementInfo ( const InstancePtr &instance )
301 : instance_( instance )
302 {
303 addReference();
304 }
305
306
307 template< int dim >
308 inline ElementInfo< dim >::ElementInfo ()
309 : instance_( null() )
310 {
311 addReference();
312 }
313
314
315 template< int dim >
316 inline ElementInfo< dim >
317 ::ElementInfo ( const MeshPointer &mesh, const MacroElement &macroElement,
318 typename FillFlags::Flags fillFlags )
319 {
320 instance_ = stack().allocate();
321 instance_->parent() = null();
322 ++(instance_->parent()->refCount);
323
324 addReference();
325
326 elInfo().fill_flag = fillFlags;
327
328 // Alberta fills opp_vertex only if there is a neighbor
329 for( int k = 0; k < maxNeighbors; ++k )
330 elInfo().opp_vertex[ k ] = -1;
331
332 fill( mesh, &macroElement, elInfo() );
333 }
334
335
336 template< int dim >
337 inline ElementInfo< dim >
338 ::ElementInfo ( const MeshPointer &mesh, const Seed &seed,
339 typename FillFlags::Flags fillFlags )
340 {
341 instance_ = stack().allocate();
342 instance_->parent() = null();
343 ++(instance_->parent()->refCount);
344
345 addReference();
346
347 // fill in macro element info
348 elInfo().fill_flag = fillFlags;
349
350 // Alberta fills opp_vertex only if there is a neighbor
351 for( int k = 0; k < maxNeighbors; ++k )
352 elInfo().opp_vertex[ k ] = -1;
353
354 fill( mesh, ((Mesh *)mesh)->macro_els + seed.macroIndex(), elInfo() );
355
356 // traverse the seed's path
357 unsigned long path = seed.path();
358 for( int i = 0; i < seed.level(); ++i )
359 {
360 InstancePtr child = stack().allocate();
361 child->parent() = instance_;
362
363 // Alberta fills opp_vertex only if there is a neighbor
364 for( int k = 0; k < maxNeighbors; ++k )
365 child->elInfo.opp_vertex[ k ] = -2;
366
367 fill( path & 1, elInfo(), child->elInfo );
368
369 instance_ = child;
370 addReference();
371
372 path = path >> 1;
373 }
374
375 assert( this->seed() == seed );
376 }
377
378
379 template< int dim >
380 inline ElementInfo< dim >::ElementInfo ( const ElementInfo &other )
381 : instance_( other.instance_ )
382 {
383 addReference();
384 }
385
386 template< int dim >
387 inline ElementInfo< dim >::ElementInfo ( ElementInfo &&other )
388 : instance_( NULL )
389 {
390 using namespace std;
391 swap( instance_, other.instance_ );
392 }
393
394 template< int dim >
395 inline ElementInfo< dim >::~ElementInfo ()
396 {
397 removeReference();
398 }
399
400
401 template< int dim >
402 inline ElementInfo< dim > &
403 ElementInfo< dim >::operator= ( const ElementInfo< dim > &other )
404 {
405 other.addReference();
406 removeReference();
407 instance_ = other.instance_;
408 return *this;
409 }
410
411 template< int dim >
412 inline ElementInfo< dim > &
413 ElementInfo< dim >::operator= ( ElementInfo< dim > &&other )
414 {
415 using namespace std;
416 swap( instance_, other.instance_ );
417 return *this;
418 }
419
420 template< int dim >
421 inline bool
422 ElementInfo< dim >::operator== ( const ElementInfo< dim > &other ) const
423 {
424 return (instance_->elInfo.el == other.instance_->elInfo.el);
425 }
426
427
428 template< int dim >
429 inline bool
430 ElementInfo< dim >::operator!= ( const ElementInfo< dim > &other ) const
431 {
432 return (instance_->elInfo.el != other.instance_->elInfo.el);
433 }
434
435
436 template< int dim >
437 inline const typename ElementInfo< dim >::MacroElement &
438 ElementInfo< dim >::macroElement () const
439 {
440 assert( !!(*this) );
441 assert( elInfo().macro_el != NULL );
442 return static_cast< const MacroElement & >( *(elInfo().macro_el) );
443 }
444
445
446 template< int dim >
447 inline ElementInfo< dim > ElementInfo< dim >::father () const
448 {
449 assert( !!(*this) );
450 return ElementInfo< dim >( instance_->parent() );
451 }
452
453
454 template< int dim >
455 inline int ElementInfo< dim >::indexInFather () const
456 {
457 const Element *element = elInfo().el;
458 const Element *father = elInfo().parent->el;
459 assert( father != NULL );
460
461 const int index = (father->child[ 0 ] == element ? 0 : 1);
462 assert( father->child[ index ] == element );
463 return index;
464 }
465
466
467 template< int dim >
468 inline ElementInfo< dim > ElementInfo< dim >::child ( int i ) const
469 {
470 assert( !isLeaf() );
471
472 InstancePtr child = stack().allocate();
473 child->parent() = instance_;
474 addReference();
475
476 // Alberta fills opp_vertex only if there is a neighbor
477 for( int k = 0; k < maxNeighbors; ++k )
478 child->elInfo.opp_vertex[ k ] = -2;
479
480 fill( i, elInfo(), child->elInfo );
481 return ElementInfo< dim >( child );
482 }
483
484
485 template< int dim >
486 inline bool ElementInfo< dim >::isLeaf () const
487 {
488 assert( !(*this) == false );
489 return isLeaf( el() );
490 }
491
492
493 template< int dim >
494 inline typename ElementInfo< dim >::Seed ElementInfo< dim >::seed () const
495 {
496 assert( !!(*this) );
497
498 int level = 0;
499 unsigned long path = 0;
500 for( InstancePtr p = instance_; p->parent() != null(); p = p->parent() )
501 {
502 const Element *element = p->elInfo.el;
503 const Element *father = p->parent()->elInfo.el;
504 const unsigned long child = static_cast< unsigned long >( father->child[ 1 ] == element );
505 path = (path << 1) | child;
506 ++level;
507 }
508
509 if( level != elInfo().level )
510 DUNE_THROW( NotImplemented, "Seed for fake elements not implemented." );
511
512 return Seed( macroElement().index, level, path );
513 }
514
515
516 template< int dim >
517 inline typename ElementInfo< dim >::MeshPointer ElementInfo< dim >::mesh () const
518 {
519 return MeshPointer( elInfo().mesh );
520 }
521
522
523 template< int dim >
524 inline bool ElementInfo< dim >::mightVanish () const
525 {
526 return mightVanish( el(), 0 );
527 }
528
529
530 template< int dim >
531 inline int ElementInfo< dim >::level () const
532 {
533 return elInfo().level;
534 }
535
536
537 template< int dim >
538 inline int ElementInfo< dim >::type () const
539 {
540 return 0;
541 }
542
543
544 template<>
545 inline int ElementInfo< 3 >::type () const
546 {
547 return instance_->elInfo.el_type;
548 }
549
550
551 template< int dim >
552 inline int ElementInfo< dim >::getMark () const
553 {
554 return el()->mark;
555 }
556
557
558 template< int dim >
559 inline void ElementInfo< dim >::setMark ( int refCount ) const
560 {
561 assert( isLeaf() );
562 assert( (refCount >= -128) && (refCount < 127) );
563 el()->mark = refCount;
564 }
565
566
567 template< int dim >
568 inline bool ElementInfo< dim >::hasLeafNeighbor ( const int face ) const
569 {
570 assert( !!(*this) );
571 assert( (face >= 0) && (face < maxNeighbors) );
572
573 assert( (elInfo().fill_flag & FillFlags::boundaryId) != 0 );
574 const int macroFace = elInfo().macro_wall[ face ];
575 if( macroFace >= 0 )
576 return (macroElement().neighbor( macroFace ) != NULL);
577 else
578 return true;
579 }
580
581
582 template< int dim >
583 inline ElementInfo< dim > ElementInfo< dim >::leafNeighbor ( const int face ) const
584 {
585 assert( (face >= 0) && (face < numFaces) );
586 ElementInfo neighbor;
587 Library< dimWorld >::leafNeighbor( *this, face, neighbor );
588 return neighbor;
589 }
590
591
592 template< int dim >
593 inline int ElementInfo< dim >
594 ::levelNeighbors ( const int face, ElementInfo (&neighbor)[ maxLevelNeighbors ], int (&faceInNeighbor)[ maxLevelNeighbors ] ) const
595 {
596 assert( (face >= 0) && (face < numFaces) );
597 return Library< dimWorld >::levelNeighbors( *this, face, neighbor, faceInNeighbor );
598 }
599
600
601 template< int dim >
602 template< int codim >
603 inline int ElementInfo< dim >::twist ( int subEntity ) const
604 {
605 return Twist< dim, dim-codim >::twist( element(), subEntity );
606 }
607
608
609 template< int dim >
610 inline int ElementInfo< dim >::twistInNeighbor ( const int face ) const
611 {
612 assert( neighbor( face ) != NULL );
613 return Twist< dim, dim-1 >::twist( neighbor( face ), elInfo().opp_vertex[ face ] );
614 }
615
616
617 template< int dim >
618 inline bool ElementInfo< dim >::isBoundary ( int face ) const
619 {
620 assert( !!(*this) );
621 assert( (face >= 0) && (face < maxNeighbors) );
622
623 assert( (elInfo().fill_flag & FillFlags::boundaryId) != 0 );
624 const int macroFace = elInfo().macro_wall[ face ];
625 if( macroFace >= 0 )
626 return macroElement().isBoundary( macroFace );
627 else
628 return false;
629 }
630
631
632 template< int dim >
633 inline int ElementInfo< dim >::boundaryId ( int face ) const
634 {
635 assert( !!(*this) );
636 assert( (face >= 0) && (face < N_WALLS_MAX) );
637
638 assert( (elInfo().fill_flag & FillFlags::boundaryId) != 0 );
639 const int macroFace = elInfo().macro_wall[ face ];
640 const int id = macroElement().boundaryId( macroFace );
641 // this assertion is only allowed, if FILL_BOUND is set
642 // assert( id == elInfo().wall_bound[ face ] );
643 return id;
644 }
645
646
647 template< int dim >
648 inline AffineTransformation *
649 ElementInfo< dim >::transformation ( int face ) const
650 {
651 assert( !!(*this) );
652 assert( (face >= 0) && (face < N_WALLS_MAX) );
653
654 assert( (elInfo().fill_flag & FillFlags::boundaryId) != 0 );
655 const int macroFace = elInfo().macro_wall[ face ];
656 return (macroFace < 0 ? NULL : macroElement().wall_trafo[ macroFace ]);
657 }
658
659
660 template< int dim >
661 inline BasicNodeProjection *
662 ElementInfo< dim >::boundaryProjection ( int face ) const
663 {
664 assert( !!(*this) );
665 assert( (face >= 0) && (face < N_WALLS_MAX) );
666
667 assert( (elInfo().fill_flag & FillFlags::boundaryId) != 0 );
668 const int macroFace = elInfo().macro_wall[ face ];
669 if( macroFace >= 0 )
670 return static_cast< BasicNodeProjection * >( macroElement().projection[ macroFace+1 ] );
671 else
672 return 0;
673 }
674
675
676 template< int dim >
677 inline bool ElementInfo< dim >::hasCoordinates () const
678 {
679 return ((elInfo().fill_flag & FillFlags::coords) != 0);
680 }
681
682 template< int dim >
683 inline const GlobalVector &ElementInfo< dim >::coordinate ( int vertex ) const
684 {
685 assert( hasCoordinates() );
686 assert( (vertex >= 0) && (vertex < numVertices) );
687 return elInfo().coord[ vertex ];
688 }
689
690
691 template< int dim >
692 template< class Functor >
693 inline void ElementInfo< dim >::hierarchicTraverse ( Functor &functor ) const
694 {
695 functor( *this );
696 if( !isLeaf() )
697 {
698 child( 0 ).hierarchicTraverse( functor );
699 child( 1 ).hierarchicTraverse( functor );
700 }
701 }
702
703
704 template< int dim >
705 template< class Functor >
706 inline void ElementInfo< dim >::leafTraverse ( Functor &functor ) const
707 {
708 if( !isLeaf() )
709 {
710 child( 0 ).leafTraverse( functor );
711 child( 1 ).leafTraverse( functor );
712 }
713 else
714 functor( *this );
715 }
716
717
718 template< int dim >
719 inline const Element *ElementInfo< dim >::element () const
720 {
721 return elInfo().el;
722 }
723
724
725 template< int dim >
726 inline const Element *ElementInfo< dim >::neighbor ( int face ) const
727 {
728 assert( (face >= 0) && (face < numFaces) );
729 assert( (elInfo().fill_flag & FillFlags::neighbor) != 0 );
730 return elInfo().neigh[ face ];
731 }
732
733
734 template< int dim >
735 inline Element *ElementInfo< dim >::el () const
736 {
737 return elInfo().el;
738 }
739
740
741 template< int dim >
742 inline ALBERTA EL_INFO &ElementInfo< dim >::elInfo () const
743 {
744 return (instance_->elInfo);
745 }
746
747
748 template< int dim >
749 inline ElementInfo< dim >
750 ElementInfo< dim >::createFake ( const MeshPointer &mesh,
751 const Element *element, int level, int type )
752 {
753 InstancePtr instance = stack().allocate();
754 instance->parent() = null();
755 ++(instance->parent()->refCount);
756
757 instance->elInfo.mesh = mesh;
758 instance->elInfo.macro_el = NULL;
759 instance->elInfo.el = const_cast< Element * >( element );
760 instance->elInfo.parent = NULL;
761 instance->elInfo.fill_flag = FillFlags::nothing;
762 instance->elInfo.level = level;
763 instance->elInfo.el_type = type;
764
765 return ElementInfo< dim >( instance );
766 }
767
768
769 template< int dim >
770 inline ElementInfo< dim >
771 ElementInfo< dim >::createFake ( const ALBERTA EL_INFO &elInfo )
772 {
773 InstancePtr instance = stack().allocate();
774 instance->parent() = null();
775 ++(instance->parent()->refCount);
776
777 instance->elInfo = elInfo;
778 return ElementInfo< dim >( instance );
779 }
780
781
782 template< int dim >
783 inline bool ElementInfo< dim >::isLeaf ( Element *element )
784 {
785 return IS_LEAF_EL( element );
786 }
787
788
789 template< int dim >
790 inline bool ElementInfo< dim >::mightVanish ( Alberta::Element *element, int depth )
791 {
792 if( isLeaf( element ) )
793 return (element->mark < depth);
794 else
795 return (mightVanish( element->child[ 0 ], depth-1 ) && mightVanish( element->child[ 1 ], depth-1 ));
796 }
797
798
799 template< int dim >
800 inline void ElementInfo< dim >
801 ::fill ( Mesh *mesh, const ALBERTA MACRO_EL *mel, ALBERTA EL_INFO &elInfo )
802 {
803 ALBERTA fill_macro_info( mesh, mel, &elInfo );
804 }
805
806 template< int dim >
807 inline void ElementInfo< dim >
808 ::fill ( int ichild, const ALBERTA EL_INFO &parentInfo, ALBERTA EL_INFO &elInfo )
809 {
810 ALBERTA fill_elinfo( ichild, FILL_ANY, &parentInfo, &elInfo );
811 }
812
813
814 template< int dim >
815 inline void ElementInfo< dim >::addReference () const
816 {
817 ++(instance_->refCount);
818 }
819
820
821 template< int dim >
822 inline void ElementInfo< dim >::removeReference () const
823 {
824 // short-circuit for rvalues that have been drained as argument to a move operation
825 if ( !instance_ )
826 return;
827 // this loop breaks when instance becomes null()
828 for( InstancePtr instance = instance_; --(instance->refCount) == 0; )
829 {
830 const InstancePtr parent = instance->parent();
831 stack().release( instance );
832 instance = parent;
833 }
834 }
835
836
837 template< int dim >
838 inline typename ElementInfo< dim >::InstancePtr
839 ElementInfo< dim >::null ()
840 {
841 return stack().null();
842 }
843
844
845 template< int dim >
846 inline typename ElementInfo< dim >::Stack &
847 ElementInfo< dim >::stack ()
848 {
849 static Stack s;
850 return s;
851 }
852
853
854
855 // Implementation of ElementInfo::Stack
856 // ------------------------------------
857
858 template< int dim >
859 inline ElementInfo< dim >::Stack::Stack ()
860 : top_( 0 )
861 {
862 null_.elInfo.el = NULL;
863 null_.refCount = 1;
864 null_.parent() = 0;
865 }
866
867
868 template< int dim >
869 inline ElementInfo< dim >::Stack::~Stack ()
870 {
871 while( top_ != 0 )
872 {
873 InstancePtr p = top_;
874 top_ = p->parent();
875 delete p;
876 }
877 }
878
879
880 template< int dim >
881 inline typename ElementInfo< dim >::InstancePtr
882 ElementInfo< dim >::Stack::allocate ()
883 {
884 InstancePtr p = top_;
885 if( p != 0 )
886 top_ = p->parent();
887 else
888 p = new Instance;
889 p->refCount = 0;
890 return p;
891 }
892
893
894 template< int dim >
895 inline void ElementInfo< dim >::Stack::release ( InstancePtr &p )
896 {
897 assert( (p != null()) && (p->refCount == 0) );
898 p->parent() = top_;
899 top_ = p;
900 }
901
902
903 template< int dim >
904 inline typename ElementInfo< dim >::InstancePtr
905 ElementInfo< dim >::Stack::null ()
906 {
907 return &null_;
908 }
909
910 } // namespace Alberta
911
912} // namespace Dune
913
914#endif // #if HAVE_ALBERTA
915
916#endif // #ifndef DUNE_ALBERTA_ELEMENTINFO_HH
DUNE_THROW
#define DUNE_THROW(E, m)
Definition: exceptions.hh:216
Dune::FloatCmp::le
bool le(const T &first, const T &second, typename EpsilonType< T >::Type epsilon)
test if first lesser or equal second
Definition: float_cmp.cc:153
Dune::operator<
EnableIfInterOperable< T1, T2, bool >::type operator<(const RandomAccessIteratorFacade< T1, V1, R1, D > &lhs, const RandomAccessIteratorFacade< T2, V2, R2, D > &rhs)
Comparison operator.
Definition: iteratorfacades.hh:629
Dune::operator>
EnableIfInterOperable< T1, T2, bool >::type operator>(const RandomAccessIteratorFacade< T1, V1, R1, D > &lhs, const RandomAccessIteratorFacade< T2, V2, R2, D > &rhs)
Comparison operator.
Definition: iteratorfacades.hh:675
Dune::operator<=
EnableIfInterOperable< T1, T2, bool >::type operator<=(const RandomAccessIteratorFacade< T1, V1, R1, D > &lhs, const RandomAccessIteratorFacade< T2, V2, R2, D > &rhs)
Comparison operator.
Definition: iteratorfacades.hh:652
Dune::operator==
EnableIfInterOperable< T1, T2, bool >::type operator==(const ForwardIteratorFacade< T1, V1, R1, D > &lhs, const ForwardIteratorFacade< T2, V2, R2, D > &rhs)
Checks for equality.
Definition: iteratorfacades.hh:233
Dune::operator>=
EnableIfInterOperable< T1, T2, bool >::type operator>=(const RandomAccessIteratorFacade< T1, V1, R1, D > &lhs, const RandomAccessIteratorFacade< T2, V2, R2, D > &rhs)
Comparison operator.
Definition: iteratorfacades.hh:697
Dune::operator!=
EnableIfInterOperable< T1, T2, bool >::type operator!=(const ForwardIteratorFacade< T1, V1, R1, D > &lhs, const ForwardIteratorFacade< T2, V2, R2, D > &rhs)
Checks for inequality.
Definition: iteratorfacades.hh:255
Dune
Dune namespace.
Definition: alignment.hh:11
std
STL namespace.
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