refactored propagation

include/NeuralNetwork/FeedForward/Layer.h

@@ -67,6 +67,15 @@ namespace FeedForward {
 				return *neurons[neuron];
 			}
 
+			/**
+			 * @brief This is a virtual function for selecting neuron
+			 * @param neuron is position in layer
+			 * @returns Specific neuron
+			 */
+			const NeuronInterface& operator[](const std::size_t& neuron) const {
+				return *neurons[neuron];
+			}
+
 			void solve(const std::vector<float> &input, std::vector<float> &output);
 
 			/**