src/removeoverlap/constraint.cpp

   1 /**
   2  * \brief A constraint determines a minimum or exact spacing required between
   3  * two variables.
   4  *
   5  * Authors:
   6  *   Tim Dwyer <tgdwyer@gmail.com>
   7  *
   8  * Copyright (C) 2005 Authors
   9  *
  10  * Released under GNU LGPL.  Read the file 'COPYING' for more information.
  11  */
  12
  13 #include "constraint.h"
  14 #include <cassert>
  15 Constraint::Constraint(Variable *left, Variable *right, double gap, bool equality)
  16 : left(left),
  17   right(right),
  18   gap(gap),
  19   timeStamp(0),
  20   active(false),
  21   visited(false),
  22   equality(equality)
  23 {
  24         left->out.push_back(this);
  25         right->in.push_back(this);
  26 }
  27 Constraint::~Constraint() {
  28         Constraints::iterator i;
  29         for(i=left->out.begin(); i!=left->out.end(); i++) {
  30                 if(*i==this) break;
  31         }
  32         left->out.erase(i);
  33         for(i=right->in.begin(); i!=right->in.end(); i++) {
  34                 if(*i==this) break;
  35         }
  36         right->in.erase(i);
  37 }
  38 std::ostream& operator <<(std::ostream &os, const Constraint &c)
  39 {
  40         if(&c==NULL) {
  41                 os<<"NULL";
  42         } else {
  43                 const char *type=c.equality?"=":"<=";
  44                 os<<*c.left<<"+"<<c.gap<<type<<*c.right<<"("<<c.slack()<<")"<<(c.active?"-active":"");
  45         }
  46         return os;
  47 }