void Awake()
{
if (instance == null)
{
instance = this;
}
}
static void Main(string[] args)
{
//sample 1
var instance1 = MathSingleton.GetInstance1;
var instance2 = MathSingleton.GetInstance1;
Console.WriteLine($"{(instance1 == instance2).ToString()}");
var instance3 = MathSingleton.GetInstance2();
var instance4 = MathSingleton.GetInstance2();
Console.WriteLine($"{(instance3 == instance4).ToString()}");
var instance5 = MathSingleton.GetInstance3;
var instance6 = MathSingleton.GetInstance3;
Console.WriteLine($"{(instance5 == instance6).ToString()}");
var instance7 = MathSingleton.GetInstance4;
var instance8 = MathSingleton.GetInstance4;
Console.WriteLine($"{(instance7 == instance8).ToString()}");
Console.ReadKey();
}