1 files changed, 81 insertions, 0 deletions
diff --git a/fuzzylite/fl/term/Constant.h b/fuzzylite/fl/term/Constant.h
new file mode 100644
index 0000000..40ba77b
--- /dev/null
+++ b/fuzzylite/fl/term/Constant.h
@@ -0,0 +1,81 @@
+/*
+ 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 */
+