haiku/headers/libs/linprog/Variable.h

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/*
* Copyright 2007-2008, Christof Lutteroth, lutteroth@cs.auckland.ac.nz
* Copyright 2007-2008, James Kim, jkim202@ec.auckland.ac.nz
* Distributed under the terms of the MIT License.
*/
#ifndef VARIABLE_H
#define VARIABLE_H
#include <File.h>
#include <SupportDefs.h>
#include <List.h>
namespace LinearProgramming {
class Constraint;
class LinearSpec;
class Summand;
/**
* Contains minimum and maximum values.
*/
class Variable {
public:
int32 Index() const;
LinearSpec* LS() const;
double Value() const;
void SetValue(double value);
double Min() const;
void SetMin(double min);
double Max() const;
void SetMax(double max);
void SetRange(double min, double max);
const char* Label();
void SetLabel(const char* label);
operator BString() const;
void GetString(BString& string) const;
Constraint* IsEqual(Variable* var);
Constraint* IsSmallerOrEqual(Variable* var);
Constraint* IsGreaterOrEqual(Variable* var);
Constraint* IsEqual(Variable* var,
double penaltyNeg, double penaltyPos);
Constraint* IsSmallerOrEqual(Variable* var,
double penaltyNeg, double penaltyPos);
Constraint* IsGreaterOrEqual(Variable* var,
double penaltyNeg, double penaltyPos);
bool IsValid();
void Invalidate();
virtual ~Variable();
protected:
Variable(LinearSpec* ls);
private:
LinearSpec* fLS;
BList* fUsingSummands; // All Summands that link to this Variable
double fValue;
double fMin;
double fMax;
char* fLabel;
bool fIsValid;
public:
friend class LinearSpec;
friend class Constraint;
friend class Summand;
};
} // namespace LinearProgramming
using LinearProgramming::Variable;
#endif // VARIABLE_H