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diff --git a/fuzzylite/fl/variable/Variable.h b/fuzzylite/fl/variable/Variable.h
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+/*
+ Author: Juan Rada-Vilela, Ph.D.
+ Copyright (C) 2010-2014 FuzzyLite Limited
+ All rights reserved
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Lesser General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option)
+ any later version.
+
+ fuzzylite is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with fuzzylite.  If not, see <http://www.gnu.org/licenses/>.
+
+ fuzzylite™ is a trademark of FuzzyLite Limited.
+
+ */
+
+#ifndef FL_VARIABLE_H
+#define FL_VARIABLE_H
+
+#include "fl/fuzzylite.h"
+#include "fl/defuzzifier/Centroid.h"
+
+#include <string>
+#include <vector>
+
+namespace fl {
+
+    class Term;
+
+    class FL_API Variable {
+    private:
+        void copyFrom(const Variable& source);
+
+    protected:
+        std::string _name;
+        std::vector<Term*> _terms;
+        scalar _minimum, _maximum;
+        bool _enabled;
+
+    public:
+        explicit Variable(const std::string& name = "",
+                scalar minimum = -fl::inf,
+                scalar maximum = fl::inf);
+        Variable(const Variable& other);
+        Variable& operator=(const Variable& other);
+        virtual ~Variable();
+        FL_DEFAULT_MOVE(Variable)
+
+        virtual void setName(const std::string& name);
+        virtual std::string getName() const;
+
+        virtual void setRange(scalar minimum, scalar maximum);
+        virtual scalar range() const;
+
+        virtual void setMinimum(scalar minimum);
+        virtual scalar getMinimum() const;
+
+        virtual void setMaximum(scalar maximum);
+        virtual scalar getMaximum() const;
+
+        virtual void setEnabled(bool enabled);
+        virtual bool isEnabled() const;
+
+        virtual std::string fuzzify(scalar x) const;
+        virtual Term* highestMembership(scalar x, scalar* yhighest = fl::null) const;
+
+        virtual std::string toString() const;
+
+        /**
+         * Operations for iterable datatype _terms
+         */
+        virtual void sort();
+        virtual void addTerm(Term* term);
+        virtual void insertTerm(Term* term, int index);
+        virtual Term* getTerm(int index) const;
+        virtual Term* getTerm(const std::string& name) const;
+        virtual bool hasTerm(const std::string& name) const;
+        virtual Term* removeTerm(int index);
+        virtual int numberOfTerms() const;
+        virtual void setTerms(const std::vector<Term*>& terms);
+        virtual const std::vector<Term*>& terms() const;
+        virtual std::vector<Term*>& terms();
+
+    };
+
+}
+
+#endif /* FL_VARIABLE_H */