HilbertBasecase.h

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/* Frobby: Software for monomial ideal computations.
   Copyright (C) 2007 Bjarke Hammersholt Roune (www.broune.com)
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see http://www.gnu.org/licenses/.
*/
#ifndef HILBERT_BASECASE_GUARD
#define HILBERT_BASECASE_GUARD
 
class Ideal;
 
#include "Term.h"
#include "ElementDeleter.h"
 
#include <vector>
 
class HilbertBasecase {
 public:
  HilbertBasecase();
  ~HilbertBasecase();
 
  // Clears ideal.
  void computeCoefficient(Ideal& ideal);
 
  const mpz_class& getLastCoefficient();
 
 private:
  struct Entry {
    bool negate;
    size_t extraSupport;
    Ideal* ideal;
  };
  vector<Entry> _todo;
  void clearTodo();
 
  bool stepComputation(Entry& entry, Entry& newEntry);
 
  auto_ptr<Ideal> getNewIdeal();
  void freeIdeal(auto_ptr<Ideal> ideal);
  vector<Ideal*> _idealCache;
  ElementDeleter<vector<Ideal*> > _idealCacheDeleter;
 
  bool canSimplify(size_t var, const Ideal& ideal, const Term& counts);
  size_t eliminate1Counts(Ideal& ideal, Term& counts, bool& negate);
 
  mpz_class _sum;
  Term _term;
  size_t _stepsPerformed;
};
 
#endif