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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 "constraint.h"
#include <cassert>
namespace vpsc {
Constraint::Constraint(Variable *left, Variable *right, double gap, bool equality)
: left(left), right(right), gap(gap), lm(0), timeStamp(0), active(false), visited(false),
equality(equality) {
left->out.push_back(this);
right->in.push_back(this);
}
Constraint::~Constraint() {
Constraints::iterator i;
for (i = left->out.begin(); i != left->out.end(); ++i) {
if (*i == this)
break;
}
left->out.erase(i);
for (i = right->in.begin(); i != right->in.end(); ++i) {
if (*i == this)
break;
}
right->in.erase(i);
}
std::ostream &operator<<(std::ostream &os, const Constraint &c) {
const char *type = c.equality ? "=" : "<=";
os << *c.left << "+" << c.gap << type << *c.right << "(" << c.slack() << ")"
<< (c.active ? "-active" : "");
return os;
}
} // namespace vpsc
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