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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
//
// ClFDVariable.h
#ifndef ClFDVariable_H
#define ClFDVariable_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 <cstdio>
#include <map>
#include <string>
#include <list>
#include "Cassowary.h"
#include "ClAbstractVariable.h"
using std::map;
using std::list;
using std::string;
class ClFDVariable : public ClAbstractVariable {
public:
typedef ClAbstractVariable super;
#if 0 /* GJB:FIXME:: */
ClFDVariable(string name, FDNumber Value) :
ClAbstractVariable(name),
_value(Value),
_fSet(true),
_desired_value(Value),
_plfdnInitialDomain(0)
{ }
#endif
ClFDVariable(string name, FDNumber Value, const list<FDNumber> &initial_domain) :
ClAbstractVariable(name),
_value(Value),
_fSet(true),
_desired_value(Value),
_plfdnInitialDomain(new list<FDNumber>())
{
*_plfdnInitialDomain = initial_domain;
}
virtual bool IsFDVariable() const
{ return true; }
// Return true if this a variable known outside the solver.
// (We need to give such variables a Value after solving is complete.)
virtual bool IsExternal() const
{ return true; }
#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
// Return the current Value I hold.
Number Value() const
{ return _value; }
// Round the Value to an integer and return it
int IntValue() const
{ return _value; }
// change the Value held -- should *not* use this if the variable is
// in a solver -- instead use AddEditVar() and SuggestValue() interface
void SetValue(FDNumber Value)
{ _value = Value; }
// 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)
{ _value = Value; }
virtual bool FIsSet()
{ return _fSet; }
virtual void SetFIsSet(bool f)
{ _fSet = f; }
virtual FDNumber DesiredValue() const
{ return _desired_value; }
virtual const list<FDNumber> *PlfdnDomain() const
{ return _plfdnInitialDomain; }
protected:
// 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 ClFDVariable.c, compile-time error everywhere else
ClFDVariable(const ClFDVariable &);
FDNumber _value;
// has the _value been set? Used during solves.
bool _fSet;
FDNumber _desired_value;
list<FDNumber> *_plfdnInitialDomain;
};
#endif
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