new_base_change.h

// ---------------------------------------------------------------------------
//
//  This file is part of PermLib.
//
// Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. The name of the author may not be used to endorse or promote products
//    derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// ---------------------------------------------------------------------------
 
 
#ifndef NEWBASECHANGE_H_
#define NEWBASECHANGE_H_
 
#include <permlib/change/base_change.h>
#include <permlib/generator/bsgs_random_generator.h>
#include <permlib/construct/random_schreier_sims_construction.h>
 
namespace permlib {

template<class PERM, class TRANS>
class NewBaseChange : public BaseChange<PERM,TRANS> {
public:
        NewBaseChange(const BSGS<PERM,TRANS> &bsgs);
        ~NewBaseChange();

        template <class InputIterator>
        void change(BSGS<PERM,TRANS> &bsgs, InputIterator baseBegin, InputIterator baseEnd, bool skipRedundant = false) const;
private:
        RandomGenerator<PERM>* rng;
        RandomSchreierSimsConstruction<PERM,TRANS> rssc;
};
 
 
template<class PERM, class TRANS>
NewBaseChange<PERM,TRANS>::NewBaseChange(const BSGS<PERM,TRANS> &bsgs) 
        : rng(new BSGSRandomGenerator<PERM,TRANS>(bsgs)),
      rssc(bsgs.n, rng, bsgs.order())
{ }
 
template<class PERM, class TRANS>
NewBaseChange<PERM,TRANS>::~NewBaseChange() {
        delete rng; 
}
 
template<class PERM, class TRANS>
template <class InputIterator>
void NewBaseChange<PERM,TRANS>::change(BSGS<PERM,TRANS> &bsgs, InputIterator baseBegin, InputIterator baseEnd, bool skipRedundant) const {
        bool guarantee = false;
        bsgs = rssc.construct(bsgs.S.begin(), bsgs.S.end(), baseBegin, baseEnd, guarantee);
        BOOST_ASSERT(guarantee);
}
 
}
 
#endif // -- NEWBASECHANGE_H_