How is the new Scene object meant to be used?

Question

Since "Scene" is not nullable, I cannot do this:

     public static Scene GetSceneWithTaggedObject(string tag)
     {
         for (int i = 0; i < SceneManager.sceneCount; i++)
         {
             Scene scene = SceneManager.GetSceneAt(i);
             foreach(GameObject go in scene.GetRootGameObjects()){
                if(go.tag == tag){
                    return scene;
                }
             }
         }
 
         Debug.LogError("Could not find the global scene.");
         return null; // Cannot do this with Unity.
     }

My question is simply: what am I supposed to return when I have a non-nullable type, such as the Scene, but still want to return something that pretty much represents "null" or "didn't find"?

Scene

http://docs.unity3d.com/ScriptReference/SceneManagement.Scene.html

SceneManager http://docs.unity3d.com/ScriptReference/SceneManagement.SceneManager.html

Answer 1

Best Answer

Answer by LazyElephant · Dec 24, 2015 at 04:57 AM

In C# you can make non-nullable types nullable by declaring them with a ? after the type, for example Scene? theScene

By changing the method definition to

public static Scene? GetSceneWithTaggedObject(string tag){...}

you will be able to return null. Just make sure the variable you're catching the returned value with is also declared as Scene?

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TruffelsAndOranges · Dec 26, 2015 at 11:28 AM 0

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Thanks. I don't know why I didn't think of that. ^^ I've been using the ?-operatorthingie before, but didn't think about it for some reason.

Follow up question: is there any reason to why the Scene class is non-nullable?

LazyElephant TruffelsAndOranges · Dec 26, 2015 at 11:30 AM 1

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It's not a class. It's a struct.

How is the new Scene object meant to be used?

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