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Question by ofuangka · Aug 26, 2016 at 04:48 AM · destroyroguelike

RogueLike tutorial GameManager question

https://unity3d.com/learn/tutorials/projects/2d-roguelike-tutorial/writing-game-manager?playlist=17150

On line 25 in the GameManager script, the singleton is enforced by calling Destroy(gameObject) when instance != this

My question is, won't the code after Destroy (lines 31-37) still get executed on that condition and be a waste? Initially I thought Destroy might break execution, but I added a Debug.Log after it which got executed. Am I missing something?

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Answer by thor348k · Aug 27, 2016 at 06:39 AM

I hope this helps, I added some comments. Good luck :)

         void Awake()
         {
             if (instance == null)
             {
                 instance = this;
             }
             else if (instance != this)
             {   
                 /* 
                     Notice how it's the only line encapsulated?
                     This means it's the only thing that runs.
                     Curly braces make code more readable :)

                     Side Note:
                      Once an object is destroyed, it is removed from the scene.
                      It's like breaking from a loop, or returning from a function. 
                      All logic stops. In this case, it no longer exists.
                 */

                 Destroy(gameObject);    
             }
             
             DontDestroyOnLoad(gameObject);
             
             boardScript = GetComponent<BoardManager>();
             
             InitGame();
         }


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avatar image ofuangka · Aug 27, 2016 at 05:18 PM 0
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Thanks for your help. I assumed that was the case, but while experimenting I noticed that Destroy does not appear to stop all logic.

 void Awake () {
     Destroy (gameObject);
 
     // This log still occurs
     Debug.Log ("After Destroy (gameObject)");
 }

Any idea why the log still occurs?

avatar image mj321 ofuangka · Aug 27, 2016 at 05:26 PM 1
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Destroy() doesn't destroy an object immediately. It's just marked as "to destroy" and will be destroyed at the end of the frame.

avatar image thor348k mj321 · Aug 27, 2016 at 05:34 PM 1
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I never knew that. I just assumed it always was destroyed immediately because I never have any logic following it. Thanks!

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