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// $Id$
//
// Cassowary Incremental Constraint Solver
// Original Smalltalk Implementation by Alan Borning
// This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
// http://www.cs.washington.edu/homes/gjb
// (C) 1998, 1999 Greg J. Badros and Alan Borning
// See ../LICENSE for legal details regarding this software
//
// ClSlackVariable.h
#ifndef ClSlackVariable_H
#define ClSlackVariable_H
#if defined(HAVE_CONFIG_H) && !defined(CONFIG_H_INCLUDED) && !defined(CONFIG_INLINE_H_INCLUDED)
#include <cassowary/config-inline.h>
#define CONFIG_INLINE_H_INCLUDED
#endif
#include "Cassowary.h"
#include "ClAbstractVariable.h"
class ClTableau;
class ClSimplexSolver;
class ClSlackVariable : public ClAbstractVariable {
public:
#ifdef CL_FIND_LEAK
~ClSlackVariable() { --cSlackVariables; };
static long cSlackVariables;
#endif
protected:
friend class ClTableau;
friend class ClSimplexSolver;
ClSlackVariable(string Name = "") :
ClAbstractVariable(Name)
{
#ifdef CL_FIND_LEAK
++cSlackVariables;
#endif
}
ClSlackVariable(long number, char *prefix) :
ClAbstractVariable(number,prefix)
{
#ifdef CL_FIND_LEAK
++cSlackVariables;
#endif
}
#ifndef CL_NO_IO
virtual ostream &PrintOn(ostream &xo) const
{
xo << "[" << Name() << ":slack]";
return xo;
}
#endif
virtual bool IsExternal() const
{ return false; }
virtual bool IsPivotable() const
{ return true; }
virtual bool IsRestricted() const
{ return true; }
};
#endif
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