/** * \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), 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) { if(&c==NULL) { os<<"NULL"; } else { const char *type=c.equality?"=":"<="; os<<*c.left<<"+"<<c.gap<<type<<*c.right<<"("<<c.slack()<<")"<<(c.active?"-active":""); } return os; } }