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/*
fuzzylite (R), a fuzzy logic control library in C++.
Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
This file is part of fuzzylite.
fuzzylite is free software: you can redistribute it and/or modify it under
the terms of the FuzzyLite License included with the software.
You should have received a copy of the FuzzyLite License along with
fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
fuzzylite is a registered trademark of FuzzyLite Limited.
*/
#ifndef FL_CONSTANT_H
#define FL_CONSTANT_H
#include "fl/term/Term.h"
namespace fl {
/**
The Constant class is a (zero) polynomial Term that represents a constant
value @f$ f(x) = k @f$
@author Juan Rada-Vilela, Ph.D.
@see Term
@see Variable
@since 4.0
*/
class FL_API Constant : public Term {
private:
scalar _value;
public:
explicit Constant(const std::string& name = "",
scalar value = fl::nan);
virtual ~Constant() FL_IOVERRIDE;
FL_DEFAULT_COPY_AND_MOVE(Constant)
virtual std::string className() const FL_IOVERRIDE;
/**
Returns the parameters of the term
@return `"value"`
*/
virtual std::string parameters() const FL_IOVERRIDE;
/**
Configures the term with the parameters
@param parameters as `"value"`
*/
virtual void configure(const std::string& parameters) FL_IOVERRIDE;
virtual Complexity complexity() const FL_IOVERRIDE;
/**
Computes the membership function evaluated at @f$x@f$
@param x is irrelevant
@return @f$c@f$, where @f$c@f$ is the constant value
*/
virtual scalar membership(scalar x) const FL_IOVERRIDE;
/**
Sets the constant value
@param value is the constant value
*/
virtual void setValue(scalar value);
/**
Gets the constant value
@return the constant value
*/
virtual scalar getValue() const;
virtual Constant* clone() const FL_IOVERRIDE;
static Term* constructor();
};
}
#endif /* FL_CONSTANT_H */
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