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  |   
 |    
 |  namespace StartAot  
 |  {  
 |    
 |      public class Singleton<T> where T : class, new()  
 |      {  
 |    
 |          private static T m_Instance;  
 |          public static T Instance  
 |          {  
 |              get  
 |              {  
 |                  if (m_Instance == null)  
 |                  {  
 |                      m_Instance = new T();  
 |                  }  
 |                  return m_Instance;  
 |              }  
 |          }  
 |    
 |          ~Singleton()  
 |          {  
 |              m_Instance = null;  
 |          }  
 |    
 |          public static bool IsValid()  
 |          {  
 |              return m_Instance != null;  
 |          }  
 |    
 |          public static void Destroy()  
 |          {  
 |              m_Instance = null;  
 |          }  
 |      }  
 |    
 |  } 
 |  
  |