Steven D'Aprano wrote: > Devin Jeanpierre wrote: > >> It's really only dynamically typed languages that have a single null >> value of a single type. Maybe I misunderstand the original statement. > > Pascal is statically typed and has a single null pointer compatible with > all pointer types.
I'm not having a good night... In Pascal, it is spelled *nil*, not null, and it is a keyword. > C has a single nil pointer compatible with all pointer > types. And in C it is null, which apparently isn't an actual value but a macro. > I expect that the Modula and Oberon family of languages copied > Pascal, which probably copied Algol. At least I was right about Modula: The constant NIL is compatible with all pointer types, and designates a pointer that does not point to any object. NIL can be assigned to any pointer type, and any pointer type can be compared to NIL. http://www.modula2.org/reference/pointertypes.php Likewise for Oberon and Oberon-2. -- Steven -- https://mail.python.org/mailman/listinfo/python-list
