public Lazy(System.Threading.LazyThreadSafetyMode mode)
 {
 }
 public Lazy(Func <T> valueFactory, TMetadata metadata, System.Threading.LazyThreadSafetyMode mode)
 {
     Contract.Requires(valueFactory != null);
 }
 public Lazy(Func <T> valueFactory, System.Threading.LazyThreadSafetyMode mode)
 {
 }
 public Lazy(TMetadata metadata, System.Threading.LazyThreadSafetyMode mode)
 {
 }