barebones AI done

Engine.cpp

@@ -10,6 +10,8 @@
 Engine::Engine(){
 	Board* brd = new Board();
 	b = brd;
+	alpha = INT_MIN;
+	beta = INT_MAX;
 }
 
 void Engine::startGame(){
@@ -64,7 +66,6 @@ void Engine::userGame(){
 		
 		gameOver = b->isGameOver();
 		b->setValidFalse();
-		
 		b->snapshot(record, *b);
 	}
 	b->displayBoard();
@@ -111,26 +112,42 @@ void Engine::AI(int depth){
 void Engine::createMMTree(MNode* node, int depth, int alt){
 	MNode* temp;
 	char max, min;
+	bool cond = true;
 	Board current = node->getState();
 	vector<moves> listOfMoves = current.viewPossibleMoves();
 	
+	if (node->getType() == "max"){
+		if (node->getMMVal() <= alpha){
+			cond = false;
+		}
+	}
+	
+	else if (node->getType() == "min"){
+		if (node->getMMVal() >= beta){
+			cond = false;
+		}
+	}
+	
 	if (depth >= 0){
 		for (int i = 0; i < listOfMoves.size(); ++i){
 			if(current.getPiece(8 - listOfMoves[i].row, listOfMoves[i].column)->getType() == 
 								current.getTurn() && current.isThisMovePossible(8 - listOfMoves[i].row, 
 																				listOfMoves[i].column, 
 																				listOfMoves[i].moveType)){
+				if (cond){
 					current.resetTaken();
 					current = current.move(listOfMoves[i]);
 					max = current.getTurn();
 					current.changeTurns();
 					min = current.getTurn();
+					
 					/*
 					if (current.checkTaken('X'))
 						cout << "xtaken true\n";
 					if (current.checkTaken('O'))
 						cout << "otaken true\n";
 					*/
+					
 					temp = new MNode(current, listOfMoves[i], current.evaluate(max, min));
 					
 					if (alt == 1)
@@ -147,6 +164,24 @@ void Engine::createMMTree(MNode* node, int depth, int alt){
 				}
 			}
 		}
+	}
+	
+	else {
+		if (node->getType() == "max"){
+			if (node->getMMVal() > alpha){
+				alpha = node->getMMVal();
+			}
+		}
+		
+		else if (node->getType() == "min"){
+			if (node->getMMVal() < beta){
+				beta = node->getMMVal();
+			}
+		}
+	}
+	
+	//cout << "alpha: " << alpha << "\n";
+	//cout << "beta: " << beta << "\n";
 
 	return;
 }
@@ -171,16 +206,14 @@ moves Engine::evaluateMMTree(MNode* node){
 }
 
 int Engine::evaluateMMBranch(MNode* node, int max){
-	if (node->getMMVal() > max)
-		max = node->getMMVal();
-
 	vector<MNode*> children = node->getChildren();
 	
 	for (auto &c : children){
 		evaluateMMBranch(c, max);
 	}
 	
-	//cout << "max: " << max << "\n";
+	if (node->getMMVal() > max)
+		max = node->getMMVal();
 	
 	return max;
 }

Engine.h

@@ -7,7 +7,7 @@ using namespace std;
 
 class Engine {
 	Board* b;
-	
+	int alpha, beta;
 	
 public:
 	Engine();