serializatioin / deserialization and tests

include/NeuralNetwork/ActivationFunction/Linear.h

@@ -2,6 +2,8 @@
 
 #include "./ActivationFunction.h"
 
+#include <cassert>
+
 namespace NeuralNetwork {
 namespace ActivationFunction {
 
@@ -17,12 +19,17 @@ namespace ActivationFunction {
 				return new Linear(lambda);
 			}
 
-			virtual std::string stringify() const override {
-				return "{ \"class\": \"NeuralNetwork::ActivationFunction::Linear\", \"lamba\" : "+std::to_string(lambda)+"}";
+			virtual SimpleJSON::Type::Object serialize() const override {
+				return {{"class", "NeuralNetwork::ActivationFunction::Linear"}, {"lambda", lambda}};
+			}
+
+			static std::unique_ptr<Linear> deserialize(const SimpleJSON::Type::Object &obj) {
+				return std::unique_ptr<Linear>(new Linear(obj["lambda"].as<double>()));
 			}
 
 		protected:
 			float lambda;
+			NEURAL_NETWORK_REGISTER_ACTIVATION_FUNCTION(NeuralNetwork::ActivationFunction::Linear, Linear::deserialize)
 	};
 }
 }