VarNames.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 VAR_NAMES_GUARD
#define VAR_NAMES_GUARD
 
#include "HashMap.h"
 
#include <vector>
#include <string>
#include <unordered_map>
class Scanner;
 
class VarNames {
public:
  VarNames();
  VarNames(size_t varCount);
  VarNames(const VarNames& names);
  ~VarNames();
 
  bool addVar(const string& name);
 
  void addVarSyntaxCheckUnique(const Scanner& in, const string& name);
 
  bool operator<(const VarNames& names) const;
 
  size_t getIndex(const string& name) const;
 
  bool contains(const string& name) const;
 
  bool namesAreDefault() const;
 
  const string& getName(size_t index) const;
 
  size_t getVarCount() const;
 
  void clear();
 
  bool empty() const;
 
  VarNames& operator=(const VarNames& names);
  bool operator==(const VarNames& names) const;
  bool operator!=(const VarNames& names) const;
 
  void swapVariables(size_t a, size_t b);
 
  void projectVar(size_t index);
 
  void toString(string& str) const;
  void print(FILE* file) const; // For debug
 
  void swap(VarNames& names);
 
  static const size_t invalidIndex = static_cast<size_t>(-1);
 
private:
  static bool compareNames(const string* a, const string* b);
 
  typedef unordered_map<string, size_t> VarNameMap;
  //typedef HashMap<string, size_t> VarNameMap;
  VarNameMap _nameToIndex;
  vector<const string*> _indexToName;
};
 
 
 
inline size_t VarNames::getVarCount() const {
  return _indexToName.size();
}
 
#endif