SafeStatic.cs

using UnityEngine.SceneManagement;

/// <summary>
/// Data wrapper that automatically resets to default value on scene load.
/// Make a static instance for safer per-scene static access to data.
/// </summary>
public class SafeStatic<T> {
	public T value;
	public T defaultValue;

	/// <summary>
	/// Create a new SafeStatic instance with a default value of default(T).
	/// </summary>
	public SafeStatic(){
		defaultValue = default(T);
		SceneManager.activeSceneChanged += (sOld, sNew)=>{value = defaultValue;};
	}
	/// <summary>
	/// Create a new SafeStatic instance with identical default and initial values.
	/// Dangerous for reference types, as defaultValue and value will point to the same object!
	/// </summary>
	public SafeStatic(T defaultValue) : this() {
		this.value = this.defaultValue = defaultValue;
	}
	/// <summary>
	/// Create a new SafeStatic instance with default and initial value.
	/// For reference types, defaultValue and value should not point to the same object.
	/// </summary>
	public SafeStatic(T defaultValue, T value) : this() {
		this.value = value;
		this.defaultValue = defaultValue;
	}
}

// Example
/*
public class MyClass {
	// someState will reset to false every time the scene loads
	static SafeStatic<bool> someState = new SafeStatic<bool>(false);
	
	public void ToggleForWhateverReason(){
		someState.value = !someState.value;
	}
}
*/