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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_ACTIVATION_H
+#define FL_ACTIVATION_H
+
+#include "fl/fuzzylite.h"
+
+#include "fl/Complexity.h"
+
+namespace fl {
+    class RuleBlock;
+
+    /**
+      The Activation class is the abstract class for RuleBlock activation
+      methods. An activation method implements the criteria to activate the
+      rules within a given rule block. An activation method needs to process
+      every rule and determine whether the rule is to be activated or
+      deactivated. The activation methods were first introduced in version 6.0,
+      but in earlier versions the term `activation` referred to the TNorm that
+      modulated the consequent of a rule, which is now referred to as the
+      `implication` operator.
+
+      @author Juan Rada-Vilela, Ph.D.
+      @see Rule
+      @see RuleBlock
+      @see ActivationFactory
+      @since 6.0
+     */
+
+    class FL_API Activation {
+    public:
+
+        Activation() { }
+
+        virtual ~Activation() { }
+
+        FL_DEFAULT_COPY_AND_MOVE(Activation)
+
+        /**
+          Returns the name of the activation method, which is also utilized to
+          register the activation method in the ActivationFactory.
+          @return the name of the activation method
+          @see ActivationFactory
+         */
+        virtual std::string className() const = 0;
+
+        /**
+          Returns the parameters of the activation method, which can be used to
+          configure other instances of the activation method.
+          @return the parameters of the activation method
+         */
+        virtual std::string parameters() const = 0;
+
+        /**
+          Configures the activation method with the given parameters.
+          @param parameters contains a list of space-separated parameter values
+         */
+        virtual void configure(const std::string& parameters) = 0;
+
+        /**
+          Computes the estimated complexity of activating the given rule block
+          @return the estimated complexity of activating the given rule block
+         */
+        virtual Complexity complexity(const RuleBlock* ruleBlock) const = 0;
+
+        /**
+          Activates the rule block
+          @param ruleBlock is the rule block to activate
+         */
+        virtual void activate(RuleBlock* ruleBlock) = 0;
+
+        /**
+          Clones the activation method.
+          @return a clone of the activation method
+         */
+        virtual Activation* clone() const = 0;
+    };
+
+}
+
+#endif /* FL_ACTIVATION_H */