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 * \brief A constraint determines a minimum or exact spacing required between
 * two variables.
 * Authors:
 *   Tim Dwyer <tgdwyer@gmail.com>
 * Copyright (C) 2005 Authors
 * Released under GNU LGPL.  Read the file 'COPYING' for more information.


#include <iostream>
#include "variable.h"
namespace vpsc {

class Constraint
      friend std::ostream& operator <<(std::ostream &os,const Constraint &c);
      Variable *left;
      Variable *right;
      double gap;
      double lm;
      Constraint(Variable *left, Variable *right, double gap, bool equality=false);
    virtual ~Constraint();
      inline double slack() const { return right->position() - gap - left->position(); }
      long timeStamp;
      bool active;
      bool visited;
      bool equality;
#include <float.h>
#include "block.h"
static inline bool compareConstraints(Constraint *const &l, Constraint *const &r) {
      double const sl = 
            l->left->block->timeStamp > l->timeStamp
      double const sr = 
            r->left->block->timeStamp > r->timeStamp
      if(sl==sr) {
            // arbitrary choice based on id
            if(l->left->id==r->left->id) {
                  if(l->right->id<r->right->id) return true;
                  return false;
            if(l->left->id<r->left->id) return true;
            return false;
      return sl < sr;


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