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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
//
// ClFDConnectorVariable.h
#ifndef ClFDConnectorVariable_H
#define ClFDConnectorVariable_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 <stdio.h>
#include <map>
#include <string>
#include <list>
#include "Cassowary.h"
#include "ClVariable.h"
#include "ClFDVariable.h"
#include "ClLinearEquation.h"
#include "ClSimplexSolver.h"
/* Creates a new variable in the FD region
that sets clvFloat in solver (simplex region)
when it changes */
class ClFDConnectorVariable : public ClFDVariable {
public:
typedef ClFDVariable super;
ClFDConnectorVariable(string name, FDNumber Value, const list<FDNumber> &initial_domain,
ClSimplexSolver &solver, ClVariable clvFloat) :
ClFDVariable(name,Value,initial_domain),
_solver(solver),
_clvFloat(clvFloat),
_pcnRequiredLink(new ClLinearEquation(clvFloat,Value))
{ solver.AddConstraint(_pcnRequiredLink); }
#ifndef CL_NO_IO
// Prints a semi-descriptive representation to the stream, using the
// name if there is one, and otherwise the hash number of this
// object.
// EXAMPLE
// [x:10.0] -- name = "x", Value = 10.0
virtual ostream &PrintOn(ostream &xo) const;
#endif
// permit overriding in subclasses in case something needs to be
// done when the Value is changed by the solver
// may be called when the Value hasn't actually changed -- just
// means the solver is setting the external variable
virtual void ChangeValue(FDNumber Value)
{
if (_value != Value) {
_value = Value;
cerr << "Updating " << _clvFloat << " now!" << endl;
_solver.RemoveConstraint(_pcnRequiredLink);
_pcnRequiredLink->ChangeConstant(_value);
_solver.AddConstraint(_pcnRequiredLink);
}
}
private:
// similar to SetValue -- see caveat above -- made private for now
// since it's probably the wrong thing and is too easy to invoke
FDNumber operator=(FDNumber Value)
{ _value = Value; return Value; }
// Copy constructor left undefined since we want to
// outlaw passing by Value! Will get a link error if you
// try to use within ClFDConnectorVariable.c, compile-time error everywhere else
ClFDConnectorVariable(const ClFDConnectorVariable &);
ClSimplexSolver &_solver;
ClVariable _clvFloat;
ClLinearEquation *_pcnRequiredLink;
};
#endif
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