src/libvpsc/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 namespace vpsc {
  16 Constraint::Constraint(Variable *left, Variable *right, double gap, bool equality)
  17 : left(left),
  18   right(right),
  19   gap(gap),
  20   timeStamp(0),
  21   active(false),
  22   visited(false),
  23   equality(equality)
  24 {
  25         left->out.push_back(this);
  26         right->in.push_back(this);
  27 }
  28 Constraint::~Constraint() {
  29         Constraints::iterator i;
  30         for(i=left->out.begin(); i!=left->out.end(); i++) {
  31                 if(*i==this) break;
  32         }
  33         left->out.erase(i);
  34         for(i=right->in.begin(); i!=right->in.end(); i++) {
  35                 if(*i==this) break;
  36         }
  37         right->in.erase(i);
  38 }
  39 std::ostream& operator <<(std::ostream &os, const Constraint &c)
  40 {
  41         if(&c==NULL) {
  42                 os<<"NULL";
  43         } else {
  44                 const char *type=c.equality?"=":"<=";
  45                 os<<*c.left<<"+"<<c.gap<<type<<*c.right<<"("<<c.slack()<<")"<<(c.active?"-active":"");
  46         }
  47         return os;
  48 }
  49 }