hamming.cpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Guido Tack, 2004
 *
 *  Last modified:
 *     $Date: 2010-10-07 11:52:01 +0200 (Thu, 07 Oct 2010) $ by $Author: schulte $
 *     $Revision: 11473 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
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#include <gecode/driver.hh>
#include <gecode/int.hh>
#include <gecode/minimodel.hh>
#include <gecode/set.hh>

using namespace Gecode;

class HammingOptions : public Options {
private:
  Driver::UnsignedIntOption _bits;
  Driver::UnsignedIntOption _distance;
  Driver::UnsignedIntOption _size;
  
public:
  HammingOptions(const char* s, unsigned int bits0,
                 unsigned int distance0, unsigned int size0)
  : Options(s), 
    _bits("-bits","word size in bits",bits0), 
    _distance("-distance","minimum distance",distance0),
    _size("-size","number of symbols",size0) {
    add(_bits); add(_distance); add(_size);
  }
  
  unsigned int bits(void) const { return _bits.value(); }
  unsigned int distance(void) const { return _distance.value(); }
  unsigned int size(void) const { return _size.value(); }
  
};

class Hamming : public Script {
private:
  SetVarArray x;
public:
  Hamming(const HammingOptions& opt) :
    x(*this,opt.size(),IntSet::empty,1,opt.bits()) {
    SetVarArgs cx(x.size());
    for (int i=x.size(); i--;)
      cx[i] = expr(*this, -x[i]);

    for (int i=0; i<x.size(); i++)
      for (int j=i+1; j<x.size(); j++)
        rel(*this,
            cardinality(x[j] & cx[i]) +
            cardinality(x[i] & cx[j]) >= opt.distance());

    branch(*this, x, SET_VAR_NONE, SET_VAL_MIN_INC);
  }

  virtual void
  print(std::ostream& os) const {
    for (int i=0; i<x.size(); i++) {
      os << "\t[" << i << "] = " << x[i] << std::endl;
    }
  }

  Hamming(bool share, Hamming& s) : Script(share,s) {
    x.update(*this, share, s.x);
  }
  virtual Space*
  copy(bool share) {
    return new Hamming(share,*this);
  }

};

int
main(int argc, char* argv[]) {
  HammingOptions opt("Hamming",20,3,32);
  opt.parse(argc,argv);
  Script::run<Hamming,DFS,HammingOptions>(opt);
  return 0;
}


// STATISTICS: example-any