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graph.hh
1 // -*- coding: utf-8 -*-
2 // Copyright (C) 2014, 2015, 2016, 2017 Laboratoire de Recherche et
3 // Développement de l'Epita.
4 //
5 // This file is part of Spot, a model checking library.
6 //
7 // Spot is free software; you can redistribute it and/or modify it
8 // under the terms of the GNU General Public License as published by
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11 //
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14 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 // License for more details.
16 //
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19 
20 #pragma once
21 
22 #include <spot/misc/common.hh>
23 #include <vector>
24 #include <type_traits>
25 #include <tuple>
26 #include <cassert>
27 #include <iterator>
28 #include <algorithm>
29 #include <map>
30 #include <iostream>
31 #include <type_traits>
32 
33 namespace spot
34 {
35  template <typename State_Data, typename Edge_Data>
36  class SPOT_API digraph;
37 
38  namespace internal
39  {
40 #ifndef SWIG
41  template <typename Of, typename ...Args>
43  {
44  static const bool value = false;
45  };
46 
47  template <typename Of, typename Arg1, typename ...Args>
48  struct first_is_base_of<Of, Arg1, Args...>
49  {
50  static const bool value =
51  std::is_base_of<Of, typename std::decay<Arg1>::type>::value;
52  };
53 #endif
54 
55  // The boxed_label class stores Data as an attribute called
56  // "label" if boxed is true. It is an empty class if Data is
57  // void, and it simply inherits from Data if boxed is false.
58  //
59  // The data() method offers an homogeneous access to the Data
60  // instance.
61  template <typename Data, bool boxed = !std::is_class<Data>::value>
62  struct SPOT_API boxed_label
63  {
64  typedef Data data_t;
65  Data label;
66 
67 #ifndef SWIG
68  template <typename... Args,
69  typename = typename std::enable_if<
70  !first_is_base_of<boxed_label, Args...>::value>::type>
71  boxed_label(Args&&... args)
72  noexcept(std::is_nothrow_constructible<Data, Args...>::value)
73  : label{std::forward<Args>(args)...}
74  {
75  }
76 #endif
77 
78  // if Data is a POD type, G++ 4.8.2 wants default values for all
79  // label fields unless we define this default constructor here.
80  explicit boxed_label()
81  noexcept(std::is_nothrow_constructible<Data>::value)
82  {
83  }
84 
85  Data& data()
86  {
87  return label;
88  }
89 
90  const Data& data() const
91  {
92  return label;
93  }
94 
95  bool operator<(const boxed_label& other) const
96  {
97  return label < other.label;
98  }
99  };
100 
101  template <>
102  struct SPOT_API boxed_label<void, true>: public std::tuple<>
103  {
104  typedef std::tuple<> data_t;
105  std::tuple<>& data()
106  {
107  return *this;
108  }
109 
110  const std::tuple<>& data() const
111  {
112  return *this;
113  }
114 
115  };
116 
117  template <typename Data>
118  struct SPOT_API boxed_label<Data, false>: public Data
119  {
120  typedef Data data_t;
121 
122 #ifndef SWIG
123  template <typename... Args,
124  typename = typename std::enable_if<
125  !first_is_base_of<boxed_label, Args...>::value>::type>
126  boxed_label(Args&&... args)
127  noexcept(std::is_nothrow_constructible<Data, Args...>::value)
128  : Data{std::forward<Args>(args)...}
129  {
130  }
131 #endif
132 
133  // if Data is a POD type, G++ 4.8.2 wants default values for all
134  // label fields unless we define this default constructor here.
135  explicit boxed_label()
136  noexcept(std::is_nothrow_constructible<Data>::value)
137  {
138  }
139 
140  Data& data()
141  {
142  return *this;
143  }
144 
145  const Data& data() const
146  {
147  return *this;
148  }
149  };
150 
152  // State storage for digraphs
154 
155  // We have two implementations, one with attached State_Data, and
156  // one without.
157 
158  template <typename Edge, typename State_Data>
159  struct SPOT_API distate_storage final: public State_Data
160  {
161  Edge succ = 0; // First outgoing edge (used when iterating)
162  Edge succ_tail = 0; // Last outgoing edge (used for
163  // appending new edges)
164 #ifndef SWIG
165  template <typename... Args,
166  typename = typename std::enable_if<
167  !first_is_base_of<distate_storage, Args...>::value>::type>
168  distate_storage(Args&&... args)
169  noexcept(std::is_nothrow_constructible<State_Data, Args...>::value)
170  : State_Data{std::forward<Args>(args)...}
171  {
172  }
173 #endif
174  };
175 
177  // Edge storage
179 
180  // Again two implementation: one with label, and one without.
181 
182  template <typename StateIn,
183  typename StateOut, typename Edge, typename Edge_Data>
184  struct SPOT_API edge_storage final: public Edge_Data
185  {
186  typedef Edge edge;
187 
188  StateOut dst; // destination
189  Edge next_succ; // next outgoing edge with same
190  // source, or 0
191  StateIn src; // source
192 
193  explicit edge_storage()
194  noexcept(std::is_nothrow_constructible<Edge_Data>::value)
195  : Edge_Data{}
196  {
197  }
198 
199 #ifndef SWIG
200  template <typename... Args>
201  edge_storage(StateOut dst, Edge next_succ,
202  StateIn src, Args&&... args)
203  noexcept(std::is_nothrow_constructible<Edge_Data, Args...>::value
204  && std::is_nothrow_constructible<StateOut, StateOut>::value
205  && std::is_nothrow_constructible<Edge, Edge>::value)
206  : Edge_Data{std::forward<Args>(args)...},
207  dst(dst), next_succ(next_succ), src(src)
208  {
209  }
210 #endif
211 
212  bool operator<(const edge_storage& other) const
213  {
214  if (src < other.src)
215  return true;
216  if (src > other.src)
217  return false;
218  // This might be costly if the destination is a vector
219  if (dst < other.dst)
220  return true;
221  if (dst > other.dst)
222  return false;
223  return this->data() < other.data();
224  }
225 
226  bool operator==(const edge_storage& other) const
227  {
228  return src == other.src &&
229  dst == other.dst &&
230  this->data() == other.data();
231  }
232  };
233 
235  // Edge iterator
237 
238  // This holds a graph and a edge number that is the start of
239  // a list, and it iterates over all the edge_storage_t elements
240  // of that list.
241 
242  template <typename Graph>
243  class SPOT_API edge_iterator
244  {
245  public:
246  typedef typename std::conditional<std::is_const<Graph>::value,
247  const typename Graph::edge_storage_t,
248  typename Graph::edge_storage_t>::type
249  value_type;
250  typedef value_type& reference;
251  typedef value_type* pointer;
252  typedef std::ptrdiff_t difference_type;
253  typedef std::forward_iterator_tag iterator_category;
254 
255  typedef typename Graph::edge edge;
256 
257  edge_iterator() noexcept
258  : g_(nullptr), t_(0)
259  {
260  }
261 
262  edge_iterator(Graph* g, edge t) noexcept
263  : g_(g), t_(t)
264  {
265  }
266 
267  bool operator==(edge_iterator o) const
268  {
269  return t_ == o.t_;
270  }
271 
272  bool operator!=(edge_iterator o) const
273  {
274  return t_ != o.t_;
275  }
276 
277  reference operator*() const
278  {
279  return g_->edge_storage(t_);
280  }
281 
282  pointer operator->() const
283  {
284  return &g_->edge_storage(t_);
285  }
286 
287  edge_iterator operator++()
288  {
289  t_ = operator*().next_succ;
290  return *this;
291  }
292 
293  edge_iterator operator++(int)
294  {
295  edge_iterator ti = *this;
296  t_ = operator*().next_succ;
297  return ti;
298  }
299 
300  operator bool() const
301  {
302  return t_;
303  }
304 
305  edge trans() const
306  {
307  return t_;
308  }
309 
310  protected:
311  Graph* g_;
312  edge t_;
313  };
314 
315  template <typename Graph>
316  class SPOT_API killer_edge_iterator: public edge_iterator<Graph>
317  {
318  typedef edge_iterator<Graph> super;
319  public:
320  typedef typename Graph::state_storage_t state_storage_t;
321  typedef typename Graph::edge edge;
322 
323  killer_edge_iterator(Graph* g, edge t, state_storage_t& src) noexcept
324  : super(g, t), src_(src), prev_(0)
325  {
326  }
327 
328  killer_edge_iterator operator++()
329  {
330  prev_ = this->t_;
331  this->t_ = this->operator*().next_succ;
332  return *this;
333  }
334 
335  killer_edge_iterator operator++(int)
336  {
337  killer_edge_iterator ti = *this;
338  ++*this;
339  return ti;
340  }
341 
342  // Erase the current edge and advance the iterator.
343  void erase()
344  {
345  edge next = this->operator*().next_succ;
346 
347  // Update source state and previous edges
348  if (prev_)
349  {
350  this->g_->edge_storage(prev_).next_succ = next;
351  }
352  else
353  {
354  if (src_.succ == this->t_)
355  src_.succ = next;
356  }
357  if (src_.succ_tail == this->t_)
358  {
359  src_.succ_tail = prev_;
360  SPOT_ASSERT(next == 0);
361  }
362 
363  // Erased edges have themselves as next_succ.
364  this->operator*().next_succ = this->t_;
365 
366  // Advance iterator to next edge.
367  this->t_ = next;
368 
369  ++this->g_->killed_edge_;
370  }
371 
372  protected:
373  state_storage_t& src_;
374  edge prev_;
375  };
376 
377 
379  // State OUT
381 
382  // Fake container listing the outgoing edges of a state.
383 
384  template <typename Graph>
385  class SPOT_API state_out
386  {
387  public:
388  typedef typename Graph::edge edge;
389  state_out(Graph* g, edge t) noexcept
390  : g_(g), t_(t)
391  {
392  }
393 
394  edge_iterator<Graph> begin() const
395  {
396  return {g_, t_};
397  }
398 
399  edge_iterator<Graph> end() const
400  {
401  return {};
402  }
403 
404  void recycle(edge t)
405  {
406  t_ = t;
407  }
408 
409  protected:
410  Graph* g_;
411  edge t_;
412  };
413 
415  // all_trans
417 
418  template <typename Graph>
419  class SPOT_API all_edge_iterator
420  {
421  public:
422  typedef typename std::conditional<std::is_const<Graph>::value,
423  const typename Graph::edge_storage_t,
424  typename Graph::edge_storage_t>::type
425  value_type;
426  typedef value_type& reference;
427  typedef value_type* pointer;
428  typedef std::ptrdiff_t difference_type;
429  typedef std::forward_iterator_tag iterator_category;
430 
431  protected:
432  typedef typename std::conditional<std::is_const<Graph>::value,
433  const typename Graph::edge_vector_t,
434  typename Graph::edge_vector_t>::type
435  tv_t;
436 
437  unsigned t_;
438  tv_t& tv_;
439 
440  void skip_()
441  {
442  unsigned s = tv_.size();
443  do
444  ++t_;
445  while (t_ < s && tv_[t_].next_succ == t_);
446  }
447 
448  public:
449  all_edge_iterator(unsigned pos, tv_t& tv) noexcept
450  : t_(pos), tv_(tv)
451  {
452  skip_();
453  }
454 
455  all_edge_iterator(tv_t& tv) noexcept
456  : t_(tv.size()), tv_(tv)
457  {
458  }
459 
460  all_edge_iterator& operator++()
461  {
462  skip_();
463  return *this;
464  }
465 
466  all_edge_iterator operator++(int)
467  {
468  all_edge_iterator old = *this;
469  ++*this;
470  return old;
471  }
472 
473  bool operator==(all_edge_iterator o) const
474  {
475  return t_ == o.t_;
476  }
477 
478  bool operator!=(all_edge_iterator o) const
479  {
480  return t_ != o.t_;
481  }
482 
483  reference operator*() const
484  {
485  return tv_[t_];
486  }
487 
488  pointer operator->() const
489  {
490  return &tv_[t_];
491  }
492  };
493 
494 
495  template <typename Graph>
496  class SPOT_API all_trans
497  {
498  public:
499  typedef typename std::conditional<std::is_const<Graph>::value,
500  const typename Graph::edge_vector_t,
501  typename Graph::edge_vector_t>::type
502  tv_t;
504  private:
505  tv_t& tv_;
506  public:
507 
508  all_trans(tv_t& tv) noexcept
509  : tv_(tv)
510  {
511  }
512 
513  iter_t begin() const
514  {
515  return {0, tv_};
516  }
517 
518  iter_t end() const
519  {
520  return {tv_};
521  }
522  };
523 
524  class SPOT_API const_universal_dests
525  {
526  private:
527  const unsigned* begin_;
528  const unsigned* end_;
529  unsigned tmp_;
530  public:
531  const_universal_dests(const unsigned* begin, const unsigned* end) noexcept
532  : begin_(begin), end_(end)
533  {
534  }
535 
536  const_universal_dests(unsigned state) noexcept
537  : begin_(&tmp_), end_(&tmp_ + 1), tmp_(state)
538  {
539  }
540 
541  const unsigned* begin() const
542  {
543  return begin_;
544  }
545 
546  const unsigned* end() const
547  {
548  return end_;
549  }
550  };
551 
552  template<class G>
554  {
555  std::map<std::vector<unsigned>, unsigned> uniq_;
556  G& g_;
557  public:
558 
559  univ_dest_mapper(G& graph)
560  : g_(graph)
561  {
562  }
563 
564  template<class I>
565  unsigned new_univ_dests(I begin, I end)
566  {
567  std::vector<unsigned> tmp(begin, end);
568  std::sort(tmp.begin(), tmp.end());
569  tmp.erase(std::unique(tmp.begin(), tmp.end()), tmp.end());
570  auto p = uniq_.emplace(tmp, 0);
571  if (p.second)
572  p.first->second = g_.new_univ_dests(tmp.begin(), tmp.end());
573  return p.first->second;
574  }
575 
576  };
577 
578  } // namespace internal
579 
580 
585  template <typename State_Data, typename Edge_Data>
586  class digraph
587  {
588  friend class internal::edge_iterator<digraph>;
589  friend class internal::edge_iterator<const digraph>;
591 
592  public:
593  typedef internal::edge_iterator<digraph> iterator;
594  typedef internal::edge_iterator<const digraph> const_iterator;
595 
596  // Extra data to store on each state or edge.
597  typedef State_Data state_data_t;
598  typedef Edge_Data edge_data_t;
599 
600  // State and edges are identified by their indices in some
601  // vector.
602  typedef unsigned state;
603  typedef unsigned edge;
604 
605  typedef internal::distate_storage<edge,
607  state_storage_t;
608  typedef internal::edge_storage<state, state, edge,
610  edge_storage_t;
611  typedef std::vector<state_storage_t> state_vector;
612  typedef std::vector<edge_storage_t> edge_vector_t;
613 
614  // A sequence of universal destination groups of the form:
615  // (n state_1 state_2 ... state_n)*
616  typedef std::vector<unsigned> dests_vector_t;
617 
618  protected:
619  state_vector states_;
620  edge_vector_t edges_;
621  dests_vector_t dests_; // Only used by alternating automata.
622  // Number of erased edges.
623  unsigned killed_edge_;
624  public:
631  digraph(unsigned max_states = 10, unsigned max_trans = 0)
632  : killed_edge_(0)
633  {
634  states_.reserve(max_states);
635  if (max_trans == 0)
636  max_trans = max_states * 2;
637  edges_.reserve(max_trans + 1);
638  // Edge number 0 is not used, because we use this index
639  // to mark the absence of a edge.
640  edges_.resize(1);
641  // This causes edge 0 to be considered as dead.
642  edges_[0].next_succ = 0;
643  }
644 
646  unsigned num_states() const
647  {
648  return states_.size();
649  }
650 
654  unsigned num_edges() const
655  {
656  return edges_.size() - killed_edge_ - 1;
657  }
658 
660  bool is_alternating() const
661  {
662  return !dests_.empty();
663  }
664 
670  template <typename... Args>
671  state new_state(Args&&... args)
672  {
673  state s = states_.size();
674  states_.emplace_back(std::forward<Args>(args)...);
675  return s;
676  }
677 
684  template <typename... Args>
685  state new_states(unsigned n, Args&&... args)
686  {
687  state s = states_.size();
688  states_.reserve(s + n);
689  while (n--)
690  states_.emplace_back(std::forward<Args>(args)...);
691  return s;
692  }
693 
699  state_storage_t&
700  state_storage(state s)
701  {
702  return states_[s];
703  }
704 
705  const state_storage_t&
706  state_storage(state s) const
707  {
708  return states_[s];
709  }
711 
717  typename state_storage_t::data_t&
718  state_data(state s)
719  {
720  return states_[s].data();
721  }
722 
723  const typename state_storage_t::data_t&
724  state_data(state s) const
725  {
726  return states_[s].data();
727  }
729 
735  edge_storage_t&
736  edge_storage(edge s)
737  {
738  return edges_[s];
739  }
740 
741  const edge_storage_t&
742  edge_storage(edge s) const
743  {
744  return edges_[s];
745  }
747 
753  typename edge_storage_t::data_t&
754  edge_data(edge s)
755  {
756  return edges_[s].data();
757  }
758 
759  const typename edge_storage_t::data_t&
760  edge_data(edge s) const
761  {
762  return edges_[s].data();
763  }
765 
771  template <typename... Args>
772  edge
773  new_edge(state src, state dst, Args&&... args)
774  {
775  edge t = edges_.size();
776  edges_.emplace_back(dst, 0, src, std::forward<Args>(args)...);
777 
778  edge st = states_[src].succ_tail;
779  SPOT_ASSERT(st < t || !st);
780  if (!st)
781  states_[src].succ = t;
782  else
783  edges_[st].next_succ = t;
784  states_[src].succ_tail = t;
785  return t;
786  }
787 
795  template <typename I>
796  state
797  new_univ_dests(I dst_begin, I dst_end)
798  {
799  unsigned sz = std::distance(dst_begin, dst_end);
800  if (sz == 1)
801  return *dst_begin;
802  SPOT_ASSERT(sz > 1);
803  unsigned d = dests_.size();
804  dests_.emplace_back(sz);
805  dests_.insert(dests_.end(), dst_begin, dst_end);
806  return ~d;
807  }
808 
815  template <typename I, typename... Args>
816  edge
817  new_univ_edge(state src, I dst_begin, I dst_end, Args&&... args)
818  {
819  return new_edge(src, new_univ_dests(dst_begin, dst_end),
820  std::forward<Args>(args)...);
821  }
822 
828  template <typename... Args>
829  edge
830  new_univ_edge(state src, const std::initializer_list<state>& dsts,
831  Args&&... args)
832  {
833  return new_univ_edge(src, dsts.begin(), dsts.end(),
834  std::forward<Args>(args)...);
835  }
836 
837  internal::const_universal_dests univ_dests(state src) const
838  {
839  if ((int)src < 0)
840  {
841  unsigned pos = ~src;
842  const unsigned* d = dests_.data();
843  d += pos;
844  unsigned num = *d;
845  return { d + 1, d + num + 1 };
846  }
847  else
848  {
849  return src;
850  }
851  }
852 
853  internal::const_universal_dests univ_dests(const edge_storage_t& e) const
854  {
855  return univ_dests(e.dst);
856  }
857 
859  state index_of_state(const state_storage_t& ss) const
860  {
861  SPOT_ASSERT(!states_.empty());
862  return &ss - &states_.front();
863  }
864 
866  edge index_of_edge(const edge_storage_t& tt) const
867  {
868  SPOT_ASSERT(!edges_.empty());
869  return &tt - &edges_.front();
870  }
871 
875  out(state src)
876  {
877  return {this, states_[src].succ};
878  }
879 
881  out(state_storage_t& src)
882  {
883  return out(index_of_state(src));
884  }
885 
887  out(state src) const
888  {
889  return {this, states_[src].succ};
890  }
891 
893  out(state_storage_t& src) const
894  {
895  return out(index_of_state(src));
896  }
898 
904  out_iteraser(state_storage_t& src)
905  {
906  return {this, src.succ, src};
907  }
908 
910  out_iteraser(state src)
911  {
912  return out_iteraser(state_storage(src));
913  }
915 
919  const state_vector& states() const
920  {
921  return states_;
922  }
923 
924  state_vector& states()
925  {
926  return states_;
927  }
929 
935  {
936  return edges_;
937  }
938 
940  {
941  return edges_;
942  }
944 
953  const edge_vector_t& edge_vector() const
954  {
955  return edges_;
956  }
957 
958  edge_vector_t& edge_vector()
959  {
960  return edges_;
961  }
963 
970  bool is_valid_edge(edge t) const
971  {
972  // Erased edges have their next_succ pointing to
973  // themselves.
974  return (t < edges_.size() &&
975  edges_[t].next_succ != t);
976  }
977 
982  bool is_dead_edge(unsigned t) const
983  {
984  return edges_[t].next_succ == t;
985  }
986 
987  bool is_dead_edge(const edge_storage_t& t) const
988  {
989  return t.next_succ == index_of_edge(t);
990  }
992 
998  const dests_vector_t& dests_vector() const
999  {
1000  return dests_;
1001  }
1002 
1003  dests_vector_t& dests_vector()
1004  {
1005  return dests_;
1006  }
1008 
1010  void dump_storage(std::ostream& o) const
1011  {
1012  unsigned tend = edges_.size();
1013  for (unsigned t = 1; t < tend; ++t)
1014  {
1015  o << 't' << t << ": (s"
1016  << edges_[t].src << ", ";
1017  int d = edges_[t].dst;
1018  if (d < 0)
1019  o << 'd' << ~d;
1020  else
1021  o << 's' << d;
1022  o << ") t" << edges_[t].next_succ << '\n';
1023  }
1024  unsigned send = states_.size();
1025  for (unsigned s = 0; s < send; ++s)
1026  {
1027  o << 's' << s << ": t"
1028  << states_[s].succ << " t"
1029  << states_[s].succ_tail << '\n';
1030  }
1031  unsigned dend = dests_.size();
1032  unsigned size = 0;
1033  for (unsigned s = 0; s < dend; ++s)
1034  {
1035  o << 'd' << s << ": ";
1036  if (size == 0)
1037  {
1038  o << '#';
1039  size = dests_[s];
1040  }
1041  else
1042  {
1043  o << 's';
1044  --size;
1045  }
1046  o << dests_[s] << '\n';
1047  }
1048  }
1049 
1056  {
1057  if (killed_edge_ == 0)
1058  return;
1059  auto i = std::remove_if(edges_.begin() + 1, edges_.end(),
1060  [this](const edge_storage_t& t) {
1061  return this->is_dead_edge(t);
1062  });
1063  edges_.erase(i, edges_.end());
1064  killed_edge_ = 0;
1065  }
1066 
1072  template<class Predicate = std::less<edge_storage_t>>
1073  void sort_edges_(Predicate p = Predicate())
1074  {
1075  //std::cerr << "\nbefore\n";
1076  //dump_storage(std::cerr);
1077  std::stable_sort(edges_.begin() + 1, edges_.end(), p);
1078  }
1079 
1085  {
1086  state last_src = -1U;
1087  edge tend = edges_.size();
1088  for (edge t = 1; t < tend; ++t)
1089  {
1090  state src = edges_[t].src;
1091  if (src != last_src)
1092  {
1093  states_[src].succ = t;
1094  if (last_src != -1U)
1095  {
1096  states_[last_src].succ_tail = t - 1;
1097  edges_[t - 1].next_succ = 0;
1098  }
1099  while (++last_src != src)
1100  {
1101  states_[last_src].succ = 0;
1102  states_[last_src].succ_tail = 0;
1103  }
1104  }
1105  else
1106  {
1107  edges_[t - 1].next_succ = t;
1108  }
1109  }
1110  if (last_src != -1U)
1111  {
1112  states_[last_src].succ_tail = tend - 1;
1113  edges_[tend - 1].next_succ = 0;
1114  }
1115  unsigned send = states_.size();
1116  while (++last_src != send)
1117  {
1118  states_[last_src].succ = 0;
1119  states_[last_src].succ_tail = 0;
1120  }
1121  //std::cerr << "\nafter\n";
1122  //dump_storage(std::cerr);
1123  }
1124 
1130  void rename_states_(const std::vector<unsigned>& newst)
1131  {
1132  SPOT_ASSERT(newst.size() == states_.size());
1133  unsigned tend = edges_.size();
1134  for (unsigned t = 1; t < tend; t++)
1135  {
1136  edges_[t].dst = newst[edges_[t].dst];
1137  edges_[t].src = newst[edges_[t].src];
1138  }
1139  }
1140 
1146  void defrag_states(std::vector<unsigned>&& newst, unsigned used_states)
1147  {
1148  SPOT_ASSERT(newst.size() >= states_.size());
1149  SPOT_ASSERT(used_states > 0);
1150 
1151  //std::cerr << "\nbefore defrag\n";
1152  //dump_storage(std::cerr);
1153 
1154  // Shift all states in states_, as indicated by newst.
1155  unsigned send = states_.size();
1156  for (state s = 0; s < send; ++s)
1157  {
1158  state dst = newst[s];
1159  if (dst == s)
1160  continue;
1161  if (dst == -1U)
1162  {
1163  // This is an erased state. Mark all its edges as
1164  // dead (i.e., t.next_succ should point to t for each of
1165  // them).
1166  auto t = states_[s].succ;
1167  while (t)
1168  std::swap(t, edges_[t].next_succ);
1169  continue;
1170  }
1171  states_[dst] = std::move(states_[s]);
1172  }
1173  states_.resize(used_states);
1174 
1175  // Shift all edges in edges_. The algorithm is
1176  // similar to remove_if, but it also keeps the correspondence
1177  // between the old and new index as newidx[old] = new.
1178  unsigned tend = edges_.size();
1179  std::vector<edge> newidx(tend);
1180  unsigned dest = 1;
1181  for (edge t = 1; t < tend; ++t)
1182  {
1183  if (is_dead_edge(t))
1184  continue;
1185  if (t != dest)
1186  edges_[dest] = std::move(edges_[t]);
1187  newidx[t] = dest;
1188  ++dest;
1189  }
1190  edges_.resize(dest);
1191  killed_edge_ = 0;
1192 
1193  // Adjust next_succ and dst pointers in all edges.
1194  for (edge t = 1; t < dest; ++t)
1195  {
1196  auto& tr = edges_[t];
1197  tr.src = newst[tr.src];
1198  tr.dst = newst[tr.dst];
1199  tr.next_succ = newidx[tr.next_succ];
1200  }
1201 
1202  // Adjust succ and succ_tails pointers in all states.
1203  for (auto& s: states_)
1204  {
1205  s.succ = newidx[s.succ];
1206  s.succ_tail = newidx[s.succ_tail];
1207  }
1208 
1209  //std::cerr << "\nafter defrag\n";
1210  //dump_storage(std::cerr);
1211  }
1212  };
1213 }
internal::killer_edge_iterator< digraph > out_iteraser(state src)
Return a fake container with all edges leaving src, allowing erasure.
Definition: graph.hh:910
Definition: graph.hh:33
Definition: graph.hh:62
state_storage_t & state_storage(state s)
return a reference to the storage of a state
Definition: graph.hh:700
const edge_storage_t & edge_storage(edge s) const
return a reference to the storage of an edge
Definition: graph.hh:742
const state_storage_t & state_storage(state s) const
return a reference to the storage of a state
Definition: graph.hh:706
edge_vector_t & edge_vector()
Return the vector of all edges.
Definition: graph.hh:958
bool is_dead_edge(unsigned t) const
Tests whether an edge has been erased.
Definition: graph.hh:982
internal::state_out< digraph > out(state_storage_t &src)
Return a fake container with all edges leaving src.
Definition: graph.hh:881
state_storage_t::data_t & state_data(state s)
return the State_Data associated to a state
Definition: graph.hh:718
state new_states(unsigned n, Args &&...args)
Create n new states.
Definition: graph.hh:685
Definition: graph.hh:243
state_vector & states()
Return the vector of states.
Definition: graph.hh:924
edge_storage_t & edge_storage(edge s)
return a reference to the storage of an edge
Definition: graph.hh:736
internal::killer_edge_iterator< digraph > out_iteraser(state_storage_t &src)
Return a fake container with all edges leaving src, allowing erasure.
Definition: graph.hh:904
state new_univ_dests(I dst_begin, I dst_end)
Create a new universal destination group.
Definition: graph.hh:797
Abstract class for states.
Definition: twa.hh:50
unsigned num_edges() const
The number of edges in the automaton.
Definition: graph.hh:654
Definition: graph.hh:184
dests_vector_t & dests_vector()
The vector used to store universal destinations.
Definition: graph.hh:1003
const dests_vector_t & dests_vector() const
The vector used to store universal destinations.
Definition: graph.hh:998
Globally.
edge new_univ_edge(state src, const std::initializer_list< state > &dsts, Args &&...args)
Create a new universal edge.
Definition: graph.hh:830
Definition: graph.hh:553
const state_vector & states() const
Return the vector of states.
Definition: graph.hh:919
void sort_edges_(Predicate p=Predicate())
Sort all edge according to a predicate.
Definition: graph.hh:1073
Definition: graph.hh:159
internal::state_out< const digraph > out(state_storage_t &src) const
Return a fake container with all edges leaving src.
Definition: graph.hh:893
edge_storage_t::data_t & edge_data(edge s)
return the Edgeg_Data of an edge.
Definition: graph.hh:754
void dump_storage(std::ostream &o) const
Dump the state and edge storage for debugging.
Definition: graph.hh:1010
void remove_dead_edges_()
Remove all dead edges.
Definition: graph.hh:1055
Definition: graph.hh:496
void rename_states_(const std::vector< unsigned > &newst)
Rename all the states in the edge vector.
Definition: graph.hh:1130
internal::state_out< digraph > out(state src)
Return a fake container with all edges leaving src.
Definition: graph.hh:875
internal::state_out< const digraph > out(state src) const
Return a fake container with all edges leaving src.
Definition: graph.hh:887
const edge_vector_t & edge_vector() const
Return the vector of all edges.
Definition: graph.hh:953
edge new_edge(state src, state dst, Args &&...args)
Create a new edge.
Definition: graph.hh:773
Definition: graph.hh:42
const state_storage_t::data_t & state_data(state s) const
return the State_Data associated to a state
Definition: graph.hh:724
Definition: graph.hh:419
Definition: twa.hh:1531
void defrag_states(std::vector< unsigned > &&newst, unsigned used_states)
Rename and remove states.
Definition: graph.hh:1146
bool is_valid_edge(edge t) const
Test whether the given edge is valid.
Definition: graph.hh:970
state index_of_state(const state_storage_t &ss) const
Convert a storage reference into a state number.
Definition: graph.hh:859
void chain_edges_()
Reconstruct the chain of outgoing edges.
Definition: graph.hh:1084
internal::all_trans< digraph > edges()
Return a fake container with all edges (exluding erased edges)
Definition: graph.hh:939
const edge_storage_t::data_t & edge_data(edge s) const
return the Edgeg_Data of an edge.
Definition: graph.hh:760
bool is_dead_edge(const edge_storage_t &t) const
Tests whether an edge has been erased.
Definition: graph.hh:987
A directed graph.
Definition: graph.hh:36
edge index_of_edge(const edge_storage_t &tt) const
Conveart a storage reference into an edge number.
Definition: graph.hh:866
digraph(unsigned max_states=10, unsigned max_trans=0)
Construct an empty graph.
Definition: graph.hh:631
edge new_univ_edge(state src, I dst_begin, I dst_end, Args &&...args)
Create a new universal edge.
Definition: graph.hh:817
bool is_alternating() const
Whether the automaton is alternating.
Definition: graph.hh:660
Definition: graph.hh:385
state new_state(Args &&...args)
Create a new states.
Definition: graph.hh:671
unsigned num_states() const
The number of states in the automaton.
Definition: graph.hh:646
internal::all_trans< const digraph > edges() const
Return a fake container with all edges (exluding erased edges)
Definition: graph.hh:934
Definition: graph.hh:316

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