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

Answer 1

I made an extension method that only works with structs:

public static bool IsNull(this T source) where T:struct
{
  return source.Equals(default(T));
}

Calling convention:

if(myStruct.IsNull())
  DoSomething();

I understand that it isn't really checking if it's null. However, if I gave it a more precise name, like IsEmpty or IsDefault, in six months I would forget it's there and upon seeing the list of methods available not pick it. It's not technically a null check; but conceptually it is.