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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
//
// ClFloatVariable.h
#ifndef ClFloatVariable_H
#define ClFloatVariable_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 "Cassowary.h"
#include "ClAbstractVariable.h"
using std::map;
using std::string;
class ClFloatVariable : public ClAbstractVariable {
public:
typedef ClAbstractVariable super;
ClFloatVariable(string name, Number Value = 0.0) :
ClAbstractVariable(name),
_value(Value)
{ }
ClFloatVariable(Number Value = 0.0) :
ClAbstractVariable(""),
_value(Value)
{ }
ClFloatVariable(long number, char *prefix, Number Value = 0.0) :
ClAbstractVariable(number,prefix),
_value(Value)
{ }
virtual bool IsFloatVariable() const
{ return true; }
// Return true if this a dummy variable (used as a marker variable
// for required equality constraints). Such variables aren't
// allowed to enter the basis when pivoting.
virtual bool IsDummy() const
{ return false; }
// 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; }
// Return true if we can Pivot on this variable.
virtual bool IsPivotable() const
{ return false; }
// Return true if this is a restricted (or slack) variable. Such
// variables are constrained to be non-negative and occur only
// internally to the simplex solver.
virtual bool IsRestricted() const
{ return false; }
#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 int(_value + 0.5); }
// change the Value held -- should *not* use this if the variable is
// in a solver -- instead use AddEditVar() and SuggestValue() interface
void SetValue(Number 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(Number Value)
{ _value = Value; }
private:
// similar to SetValue -- see caveat above -- made private for now
// since it's probably the wrong thing and is too easy to invoke
Number operator=(Number 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 ClFloatVariable.c, compile-time error everywhere else
ClFloatVariable(const ClFloatVariable &);
Number _value;
};
#endif
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