On Tuesday, 11 June 2013 at 21:02:55 UTC, Ali Çehreli wrote:
> On 06/11/2013 12:52 PM, Seany wrote:
>
> > i read here that enums, once initialized, are constants :
> > http://ddili.org/ders/d.en/enum.html
>
> enum is a type definition with a limited set of values. That part cannot be changed at runtime. (A type is a compile-time concept in D.)
>
> Of course then there are variables of an enum. Their values can change but they can take only those limited set of values. (A cast can be used to have invalid enum values. Not recommended. ;))
>
> > However, i need a method, if possible, to dynamically
> (cexecution time)
> > definition of enums, and updating them.
>
> If you are talking about changing the set of values, then it is not possible with enums at runtime. You must represent that "type" some other way. For example, you can have an associative array that you can add values to.
>
> Ali


aha. thank you.

i was nt thinking in the line of "type of a variable"

I was thinking of a function, whose domain and range is discreet
and constant,
example :  a function that randomly generates a photon to hit and
pass through and/or get absorved by a cloud (the cloud is
discreetized, and the coordinates of the fgrd cells are constant)
will deal with a constant, discreet domain / range. but i may
want to move the cloud, or create turbulence in it. in those
cases, i will need to redefine the cell coordinates. that is, i
might want to exclusively redefine domain / range.

now since this is a matter of type fixed at the compile time, i
guess i will use good old arrays, and make them constant when
needed.

On Wednesday, 12 June 2013 at 09:13:20 UTC, monarch_dodra wrote:

>
> But even then, keep i mind these aren't compile time objects, so you can't use them in a switch, for example...

thanks, i was going to commit precisely that sin.