Deciding whether there is something left to learn from responses

solver.hpp

@@ -104,31 +104,47 @@ public:
 			known.empty_color(col);
 	}
 
-	void learn_back(Historic_guess hist) {
+	bool learn_back(Historic_guess hist) {
+		bool something_to_learn = true;
 		// TODO
+		return something_to_learn;
 	}
 	void learn(vector<int> guess, vector<int> response) {
+		bool something_to_learn;
 		// None of these colors are there
-		if(response[0] == 0 && response[1] == 0)
+		if(response[0] == 0 && response[1] == 0) {
 			empty(guess);
+			something_to_learn = false;
+		}
 
 		// None at the right spot
-		else if(response[1] == 0)
+		else if(response[1] == 0) {
 			not_here(guess);
+			something_to_learn = false;
+		}
 
 		// At least only on the right spot
-		else if(response[0] == 0)
+		else if(response[0] == 0) {
 			if_not_here_then_nowhere(guess);
+			something_to_learn = true;
+		}
 
 		// TODO nonzero / nonzero
-		else
-			{}
+		else {
+			something_to_learn = true;
+		}
 
 		// Learn from previous guesses
-		for(auto hist : history)
-			learn_back(hist);
+		for(int i = 0; i < history.size(); i++)
+			if(!learn_back(history[i])) {
+				// If there is nothing left to learn from the guess
+				history.erase(history.begin()+i);
+				i--;
+			}
+
 
 		// Write to history
+		if(something_to_learn)
 			history.push_back({guess, response});
 	}
 	void print() {