haiku/headers/libs/linprog/Variable.h

89 lines
1.9 KiB
C
Raw Normal View History

/*
* 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 <ObjectList.h>
#include <String.h>
namespace LinearProgramming {
class Constraint;
class LinearSpec;
class Summand;
/**
* Contains minimum and maximum values.
*/
class Variable {
public:
int32 Index() const;
int32 GlobalIndex() 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);
BString ToString() 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();
//! Dangerous the variable don't belong to the LinearSpec anymore,
//! delete it yourself!
void Invalidate();
virtual ~Variable();
protected:
Variable(LinearSpec* ls);
//! returns the ref count
int32 AddReference();
int32 RemoveReference();
private:
LinearSpec* fLS;
double fValue;
double fMin;
double fMax;
BString fLabel;
bool fIsValid;
int32 fReferenceCount;
public:
friend class LinearSpec;
};
typedef BObjectList<Variable> VariableList;
} // namespace LinearProgramming
using LinearProgramming::Variable;
using LinearProgramming::VariableList;
#endif // VARIABLE_H