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Question by Benifir · Sep 02, 2013 at 09:05 AM · c#errorenum

Cannot Implicitly convert to bool problem?

I'm working on the main menu for my new IOS game and have run into a snag. I'm getting the error message:

Assets/SpaceCombatRPG-IOS Framework/Scripts/Non-Completed/MainMenu.cs(42,22): error CS0029: Cannot implicitly convert type MainMenu.Page' to bool'

And yes, I do know what it means, but I cannot figure out the correct way to fix it. And I do not have any boolean variables which is the odd part. I'm guessing the problem seems to be with the way I am storing variables from my enumeration? Here's the code:

 using UnityEngine;
 using System.Collections;
 
 public class MainMenu : MonoBehaviour {
     private enum Page {
         NewGame = 0,
         Resume = 1,
         LoadGame = 2,
         Options = 3,
         MoreGames = 4,
         GameGuide = 5,
         Addons = 6,
         GameCenter = 7,
         MainMenu = 8
     }
 
     private Page _currentPage;
 
     public Texture2D gameNameTexture;
     public Texture2D defaultButton;
     public Texture2D addonsButton;
     public Texture2D moreGamesButton;
     public Texture2D gameGuideButton;
     public Texture2D gameCenterButton;
     
 
     void Start() {
         _currentPage = Page.MainMenu;
     }
 
     void OnGUI() {
         if(_currentPage = Page.MainMenu)
             DisplayMainMenu();
         else if(_currentPage = Page.NewGame)
             DisplayNewGameMenu();
         else if(_currentPage = Page.Resume)
             DisplayResumeMenu();
         else if(_currentPage = Page.LoadGame)
             DisplayLoadGameMenu();
         else if(_currentPage = Page.Options)
             DisplayOptionsMenu();
         else if(_currentPage = Page.MoreGames)
             DisplayMoreGamesMenu();
         else if(_currentPage = Page.GameGuide)
             DispayGameGuideMenu();
         else if(_currentPage = Page.Addons)
             DisplayAddonsMenu();
         else if(_currentPage = Page.GameCenter)
             DisplayGameCenterMenu();
         else
             DisplayMainMenu();
     }
 
     public void DisplayMainMenu() {
         GUI.BeginGroup(new Rect(0,60,500,300));
         if(GUI.Button(new Rect((Screen.width / 2) - 100, 60, 200, 25), "New Game"))        //Change the page to NewGame menu
             _currentPage = Page.NewGame;
         if(GUI.Button(new Rect((Screen.width / 2) - 100, 90, 200, 25), "Resume"))        //Change the page to Resume menu
             _currentPage = Page.Resume;
         if(GUI.Button(new Rect((Screen.width / 2) - 100, 120, 200, 25), "Load Game"))        //Change the page to LoadGame menu
             _currentPage = Page.LoadGame;
         if(GUI.Button(new Rect((Screen.width / 2) - 100, 150, 200, 25), "Options"))        //Change the page to Options menu
             _currentPage = Page.Options;
 
         if(GUI.Button(new Rect((Screen.width / 2) - 250, 75, addonsButton.width, addonsButton.height), addonsButton))
             _currentPage = Page.Addons;
         if(GUI.Button(new Rect((Screen.width / 2) - 250, 135, moreGamesButton.width, moreGamesButton.height), moreGamesButton))
             _currentPage = Page.MoreGames;
         if(GUI.Button(new Rect((Screen.width / 2) + 250, 75, gameGuideButton.width, gameGuideButton.height), gameGuideButton))
             _currentPage = Page.GameGuide;
         if(GUI.Button(new Rect((Screen.width / 2) + 250, 135, gameCenterButton.width, gameCenterButton.height), gameCenterButton))
             _currentPage = Page.GameGuide;
 
         GUI.Label(new Rect((Screen.width / 2) - (gameNameTexture.width / 2), 10 - (gameNameTexture.height / 2), gameNameTexture.width, gameNameTexture.height), gameNameTexture);
         GUI.EndGroup();
     }
 
     void Update() {
         Debug.Log(_currentPage);
     }
 
 #region Functions not Templated
     public void DisplayLoadGameMenu() {
 
     }
 
     public void DisplayNewGameMenu() {
 
     }
 
     public void DisplayResumeMenu() {
 
     }
 
     public void DisplayOptionsMenu() {
 
     }
 
     public void DisplayMoreGamesMenu() {
 
     }
 
     public void DispayGameGuideMenu() {
 
     }
 
     public void DisplayAddonsMenu() {
 
     }
 
     public void DisplayGameCenterMenu() {
 
     }
 #endregion
 }
 
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Answer by meat5000 · Sep 02, 2013 at 09:14 AM

use = to change a value. Use == to check a condition, like in an if statement.

The error means you are trying to put something thats not a bool in to a bool. It may happen if you check a variable for true or false thats not a bool. If you are trying to check if it exists use 'null'.

To be direct, change

  if(_currentPage = Page.MainMenu)
 DisplayMainMenu();

to

  if(_currentPage == Page.MainMenu)
 DisplayMainMenu();

and do the same for the rest of the if statements

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avatar image Benifir · Sep 02, 2013 at 09:24 AM 0
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Thanks, that was really quick. I've never really thought about the = and == statement differences so I'll have to remember that.

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