Moved struct definition to separate file, and added check for displaying GUI

I moved the GameType struct (and the Mode enum) to a separate file, as I will need
to use it in the check_server and check_client functions as well. I also added the
signum function (which was previously in sign.hpp) to this file, since it was the only
function in sign.hpp. Finally, I added a check, that will only display the GUI, if the
user didn't provide any command-line arguments.

main.cpp

@@ -23,15 +23,14 @@
 #define RAYGUI_IMPLEMENTATION
 #include "includes/raygui/raygui.h"
 #include "includes/raygui/style_dark.h"
-
 #include "includes/paddle.hpp"
 #include "includes/ball.hpp"
-#include "includes/easysock.hpp"
-#include "includes/sign.hpp"
 #include "includes/connect_code.hpp"
+#include "includes/easysock.hpp"
 #include "includes/client.hpp"
 #include "includes/server.hpp"
 #include "includes/exception_consts.hpp"
+#include "includes/check_input.hpp"
 #include "includes/serialization.h"
 #include "includes/timer.h"
 
@@ -47,18 +46,12 @@ const float BASE_BOUNCE_RAD = (BASE_BOUNCE_DEG / 180.0) * M_PI;
 const float BASE_SPEED_COMPONENTS = 15;
 const float BASE_SPEED = sqrt(powf(BASE_SPEED_COMPONENTS, 2) * 2);
 
-typedef enum {M_SINGLE, M_CLIENT, M_SERVER} Mode;
+/* Simple function to return 1 if a value is positive, and -1 if it is negative */
-
+int signum(int num) {
-/* This struct contains a Mode enum, which indicates the type of game we are
+	int retval = 0;
-   playing (Single player, client mode or server mode). The netsock parameter is
+	(num > 0) ? retval = 1 : retval = -1;
-   a 'Sock' object - Client and Server classes inherit from this object, so this
+	return retval;
-   parameter can be instantiated to either a client or server, depending on the
+}
-   game type. */
-
-typedef struct {
-	Mode mode;
-	Sock* netsock;
-} GameType;
 
 raylib::Vector2 changeVelocityAfterCollision(Paddle paddle, Ball ball) {
 	float paddle_mid_y = (paddle.getRect().y + paddle.getRect().GetHeight()) / 2.0; /* Middle y value of rectangle */
@@ -223,8 +216,8 @@ int main(int argc, char** argv) {
 	bool game_started = false;
 	srand(std::time(NULL));
 
-
+	/* If there were no command-line arguments, the user is prompted in the GUI */
-
+	if (argc == 1) {
 		/* Display a drop-down menu, to allow user to pick between Single player, server and client. This section of the code uses the raygui library, and is written in C. */
 		
 		GuiLoadStyleDark(); // Load the dark theme style
@@ -309,7 +302,10 @@ int main(int argc, char** argv) {
 				EndDrawing();
 			}
 			
-		GameType type = check_server(ip_text, port_text);
+			type = check_server(ip_text, port_text);
+			free(ip_text);
+			free(port_text);
+		}
 	}
 
 	/* Variable to store the response given by the other player */