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diff --git a/fuzzylite/fl/variable/OutputVariable.h b/fuzzylite/fl/variable/OutputVariable.h
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+++ b/fuzzylite/fl/variable/OutputVariable.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_OUTPUTVARIABLE_H
+#define FL_OUTPUTVARIABLE_H
+
+#include "fl/variable/Variable.h"
+
+namespace fl {
+    class Accumulated;
+    class Defuzzifier;
+
+    class FL_API OutputVariable : public Variable {
+    private:
+        void copyFrom(const OutputVariable& other);
+    protected:
+        FL_unique_ptr<Accumulated> _fuzzyOutput;
+        FL_unique_ptr<Defuzzifier> _defuzzifier;
+        scalar _outputValue;
+        scalar _previousOutputValue;
+        scalar _defaultValue;
+        bool _lockOutputValueInRange;
+        bool _lockPreviousOutputValue;
+
+    public:
+        explicit OutputVariable(const std::string& name = "",
+                scalar minimum = -fl::inf, scalar maximum = fl::inf);
+        OutputVariable(const OutputVariable& other);
+        OutputVariable& operator=(const OutputVariable& other);
+        virtual ~OutputVariable() FL_IOVERRIDE;
+        FL_DEFAULT_MOVE(OutputVariable)
+
+        virtual Accumulated* fuzzyOutput() const;
+
+        virtual void setName(const std::string& name) FL_IOVERRIDE;
+
+        virtual void setMinimum(scalar minimum) FL_IOVERRIDE;
+        virtual void setMaximum(scalar maximum) FL_IOVERRIDE;
+
+        virtual void setDefuzzifier(Defuzzifier* defuzzifier);
+        virtual Defuzzifier* getDefuzzifier() const;
+
+        virtual void setOutputValue(scalar outputValue);
+        virtual scalar getOutputValue() const;
+
+        virtual void setPreviousOutputValue(scalar defuzzifiedValue);
+        virtual scalar getPreviousOutputValue() const;
+
+        virtual void setDefaultValue(scalar defaultValue);
+        virtual scalar getDefaultValue() const;
+
+        virtual void setLockOutputValueInRange(bool lockOutputValueInRange);
+        virtual bool isLockedOutputValueInRange() const;
+
+        virtual void setLockPreviousOutputValue(bool lockPreviousOutputValue);
+        virtual bool isLockedPreviousOutputValue() const;
+
+        virtual void defuzzify();
+
+        virtual std::string fuzzyOutputValue() const;
+
+        virtual void clear();
+
+        virtual std::string toString() const FL_IOVERRIDE;
+
+    };
+
+}
+#endif /* FL_OUTPUTVARIABLE_H */