33 #ifndef SIMPLEBASECHANGE_H_ 34 #define SIMPLEBASECHANGE_H_ 36 #include <permlib/change/base_change.h> 41 template<
class PERM,
class TRANS,
class BASETRANSPOSE>
48 template <
class InputIterator>
49 void change(
BSGS<PERM,TRANS> &bsgs, InputIterator baseBegin, InputIterator baseEnd,
bool skipRedundant =
false)
const;
56 template<
class PERM,
class TRANS,
class BASETRANSPOSE>
61 template<
class PERM,
class TRANS,
class BASETRANSPOSE>
62 template<
class InputIterator>
64 if (baseBegin == baseEnd)
67 const unsigned long origOrder __attribute__((unused)) = bsgs.
order();
70 unsigned int baseTargetPos = 0;
71 while (baseBegin != baseEnd && baseTargetPos < bsgs.
B.size()) {
72 unsigned long alpha = *baseBegin;
73 unsigned long beta = bsgs.
B[baseTargetPos];
74 const bool redundant = skipRedundant && this->isRedundant(bsgs, baseTargetPos, alpha);
76 if (!redundant && beta != alpha) {
78 for (; pos > baseTargetPos; --pos) {
79 trans.transpose(bsgs, pos-1);
89 while (!skipRedundant && baseBegin != baseEnd) {
90 const unsigned long alpha = *baseBegin;
100 BOOST_ASSERT(origOrder == bsgs.
order());
105 #endif // -- SIMPLEBASECHANGE_H_ unsigned int insertRedundantBasePoint(unsigned int beta, unsigned int minPos=0)
inserts a redundant base beta
Definition: bsgs.h:421
abstract base class for base change algorithms
Definition: base_change.h:46
SimpleBaseChange(const BSGS< PERM, TRANS > &)
constructor
Definition: simple_base_change.h:57
Integer order() const
order of the group
Definition: bsgs.h:406
void stripRedundantBasePoints(int minPos=0)
strips redundant base points from the end to the minPos-th base element
Definition: bsgs.h:436
std::vector< dom_int > B
base
Definition: bsgs_core.h:55
void change(BSGS< PERM, TRANS > &bsgs, InputIterator baseBegin, InputIterator baseEnd, bool skipRedundant=false) const
changes base of bsgs so that it starts with the sequence given by baseBegin to baseEnd ...
Definition: simple_base_change.h:63
base change by a sequence of point insertions and transpositions
Definition: simple_base_change.h:42
unsigned int m_statScheierGeneratorsConsidered
nuber of Schreier generators considered in transposition since construction
Definition: base_change.h:55
Represents a base and strong generating set (BSGS)
Definition: bsgs.h:58
Definition: abstract_bsgs.h:49