How can I check whether a struct has been instantiated? [duplicate]

Answer 1

Structs can't be null, but the workaround of checking a struct against its default can give a false negative if you actually want to store values equivalent to the defaults in it at any point.

(For example, a struct with the value (0,0,0) could be an untouched default, or it could be storing the origin point in 3D space.)

Another approach that avoids this false negative issue would be to just add another property to the struct - e.g. a bool or int - to track whether data has actually been stored in it. Then have any constructor that initializes the struct with actual data set this value to true/1. In the default struct, this value will still be false/0, so checking against default(MyStruct) should never give you a false negative even if all other data stored in it matches the default values.

public Struct MyStruct { 
    public float x { get; private set; }
    public bool initialized { get; private set; }

    public MyStruct(float _x){
        x=_x;
        initialized = true;
    }
}