`typedef' is or will be disallowed in D because of reasons I do not
understand.
It's ill-defined. There are 4 possible types of typedef:
http://d.puremagic.com/issues/show_bug.cgi?id=5467
In C and C++ their existence introduce problems because
they increase the amount of parsing passes.
C's typedef is equal to D's alias.
A named enum is a separate type with a finite set of allowed
values defined by the user.
A)
Both wrong according to the currently published reference:
Again, this thread is all about discussing the right way to do it and not
about what the buggy and holey spec reads.
2) "Enum declarations are used to define a group of constants.", i.e.
only some of the valid values of the basetype are given names. All ofthe
valid values of the basetype are also valid
That's what anonymous enums are for.
3) "An EmptyEnumBody signifies an opaque enum - the enum members are
unknown", i.e. none of the valied values of the basetype has got a
name, but all valid values of the basetype are also valid in the type
declared by the tag.
So the only purpose is to create a new type similar to typedef.
I don't see any merit in that.
