permlib  0.2.9
Library for permutation computations
vector_stabilizer_predicate.h
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31 
32 
33 #ifndef VECTORSTABILIZERPREDICATE_H_
34 #define VECTORSTABILIZERPREDICATE_H_
35 
36 #include <permlib/predicate/subgroup_predicate.h>
37 
38 #include <boost/foreach.hpp>
39 
40 namespace permlib {
41 
43 template <class PERM>
45 public:
47 
51  template<class InputIterator>
52  VectorStabilizerPredicate(InputIterator begin, InputIterator end);
53 
54  virtual bool operator()(const PERM &p) const;
55  virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const;
56  virtual unsigned int limit() const;
57 private:
58  std::vector<unsigned int> m_vec;
59 };
60 
61 //
62 // ---- IMPLEMENTATION
63 //
64 
65 template <class PERM>
66 template <class InputIterator>
67 VectorStabilizerPredicate<PERM>::VectorStabilizerPredicate(InputIterator begin, InputIterator end)
68  : m_vec(begin, end)
69 { }
70 
71 template <class PERM>
73  for (unsigned int i = 0; i < m_vec.size(); ++i) {
74  if (m_vec[p / i] != m_vec[i])
75  return false;
76  }
77  return true;
78 }
79 
80 template <class PERM>
81 bool VectorStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
82  return (m_vec[h / beta_i] == m_vec[beta_i]);
83 }
84 
85 template <class PERM>
87  return m_vec.size();
88 }
89 
90 }
91 
92 #endif // -- VECTORSTABILIZERPREDICATE_H_
virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const
checks if a given group element should not be followed in backtrack search
Definition: vector_stabilizer_predicate.h:81
virtual unsigned int limit() const
limit of recursion depth in backtrack search
Definition: vector_stabilizer_predicate.h:86
VectorStabilizerPredicate(InputIterator begin, InputIterator end)
constructor
Definition: vector_stabilizer_predicate.h:67
abstract base class for subgroup (and coset) predicates
Definition: subgroup_predicate.h:45
virtual bool operator()(const PERM &p) const
true iff group element fulfills predicate
Definition: vector_stabilizer_predicate.h:72
Definition: abstract_bsgs.h:49
predicate for the subgroup that stabilizes a given integer vector
Definition: vector_stabilizer_predicate.h:44