immutable, const, enum

[Paul D. Anderson]

bearophile Wrote:

<snip> 

> it prints: "redundant storage class in". So const and "in" seem really the same thing. But then what does it mean "immutable in"? I guess it just means transitive-immutable.
> 
> "immutable out" and "const out" are thankfully disallowed. So I guess "in" is now deprecated, it's just an alias of "const. But this idea seems wrong because "in ref" is disalloed but "const ref" is allowed, so they aren't just an alias of each other.
> 
> So the available ones are ("in" not listed to keep a bit of my sanity):
>  immutable type
>  const type
>  out type
>  immutable ref type
>  const ref type
>  type
>  type*
>  type**
>  etc
> 
<snip>

>From the D2.0/Language/Functions page, under Function Parameters:

"The in storage class is equivalent to const scope."

That's why the "const in" combination doesn't work.

Paul

"I can't tell a lie -- not even when I hear one."
John Kendrik Bangs, A House-Boat on the Styx.